303 Area CodeDenver, CO
Area code 303 covers Denver and nearby communities in Colorado, in the Mountain Time (MT) zone, home to about 3,380,487 people across 137 cities. It overlays 720 and 983, so the region uses several codes and every local call needs all ten digits.
Overview
- Major City
- Denver
- State
- Colorado (CO)
- Timezone
- Mountain Time (MT)
- Current Time
- –:––
- Overlay
- Yes – shares area with 720, 983
Overview of the 303 Area Code
What is the 303 area code?
The 303 area code serves Denver, Colorado, alongside other established area codes. When you see a 303 number, it indicates a local number within this geographic area.
Why was area code 303 created?
Area code 303 has been in service since January 1, 1947. The same territory is now also served by the overlay codes 720 and 983.
Geographic Coverage of the 303 Area Code
The 303 area code serves Denver and surrounding areas in Colorado. It operates within the Mountain Time (MT) time zone. It complements the coverage of area codes 720 and 983. This area code covers several key cities, including:
- Denver
- Aurora
- Lakewood
- Thornton
- Arvada
- Westminster
Got a call from a 303 number? It came from Denver, CO. Since 303 overlays with 720 and 983, every local call in the region needs all ten digits to land on the right line. Of the listed cities' population, Denver accounts for about 23.0%; the rest is split across 136 smaller cities.
Denver Area Codes Overview
Denver is served by multiple area codes, reflecting its telecommunications needs. The 303 area code operates alongside 720, 983. Here are the area codes serving this region:
The introduction of the 303 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 303 cover?
| City | State | Population | Population in 303 | % of listed-city population | % of City |
|---|---|---|---|---|---|
| Denver | CO | 729,019 | 729,019 | 23.0% | 100.0% |
| Aurora | CO | 403,130 | 403,130 | 12.7% | 100.0% |
| Lakewood | CO | 156,868 | 156,868 | 5.0% | 100.0% |
| Thornton | CO | 146,689 | 146,689 | 4.6% | 100.0% |
| Arvada | CO | 121,873 | 121,873 | 3.8% | 100.0% |
| Westminster | CO | 115,302 | 115,302 | 3.6% | 100.0% |
| Centennial | CO | 108,853 | 108,853 | 3.4% | 100.0% |
| Boulder | CO | 106,803 | 106,803 | 3.4% | 100.0% |
| Longmont | CO | 99,818 | 99,818 | 3.2% | 100.0% |
| Highlands Ranch | CO | 96,713 | 96,713 | 3.1% | 100.0% |
| Castle Rock | CO | 83,213 | 83,213 | 2.6% | 100.0% |
| Broomfield | CO | 78,323 | 78,323 | 2.5% | 100.0% |
| Commerce City | CO | 70,245 | 70,245 | 2.2% | 100.0% |
| Parker | CO | 65,473 | 65,473 | 2.1% | 100.0% |
| Littleton | CO | 44,879 | 44,879 | 1.4% | 100.0% |
| Brighton | CO | 43,473 | 43,473 | 1.4% | 100.0% |
| Erie | CO | 38,594 | 38,594 | 1.2% | 100.0% |
| Northglenn | CO | 38,287 | 38,287 | 1.2% | 100.0% |
| Englewood | CO | 35,238 | 35,238 | 1.1% | 100.0% |
| Ken Caryl | CO | 32,438 | 32,438 | 1.0% | 100.0% |
| Dakota Ridge | CO | 32,005 | 32,005 | 1.0% | 100.0% |
| Wheat Ridge | CO | 31,999 | 31,999 | 1.0% | 100.0% |
| Lafayette | CO | 30,587 | 30,587 | 1.0% | 100.0% |
| Columbine | CO | 24,280 | 24,280 | 0.8% | 100.0% |
| Louisville | CO | 20,811 | 20,811 | 0.7% | 100.0% |
| Golden | CO | 20,151 | 20,151 | 0.6% | 100.0% |
| Firestone | CO | 19,396 | 19,396 | 0.6% | 100.0% |
| Sherrelwood | CO | 18,287 | 18,287 | 0.6% | 100.0% |
| Frederick | CO | 17,937 | 17,937 | 0.6% | 100.0% |
| Greenwood Village | CO | 15,288 | 15,288 | 0.5% | 100.0% |
| Castle Pines | CO | 15,162 | 15,162 | 0.5% | 100.0% |
| Welby | CO | 14,846 | 14,846 | 0.5% | 100.0% |
| Lone Tree | CO | 14,061 | 14,061 | 0.5% | 100.0% |
| Federal Heights | CO | 13,971 | 13,971 | 0.4% | 100.0% |
| Superior | CO | 13,654 | 13,654 | 0.4% | 100.0% |
| Berkley | CO | 11,207 | 11,207 | 0.4% | 100.0% |
| Cherry Creek | CO | 11,120 | 11,120 | 0.4% | 100.0% |
| The Pinery | CO | 10,517 | 10,517 | 0.3% | 100.0% |
| Castle Pines North | CO | 10,360 | 10,360 | 0.3% | 100.0% |
| Fort Lupton | CO | 9,948 | 9,948 | 0.3% | 100.0% |
| Gunbarrel | CO | 9,263 | 9,263 | 0.3% | 100.0% |
| Roxborough Park | CO | 9,099 | 9,099 | 0.3% | 100.0% |
| Evergreen | CO | 9,038 | 9,038 | 0.3% | 100.0% |
| Stonegate | CO | 8,962 | 8,962 | 0.3% | 100.0% |
| Lochbuie | CO | 8,599 | 8,599 | 0.3% | 100.0% |
| Derby | CO | 7,685 | 7,685 | 0.3% | 100.0% |
| Fairmount | CO | 7,559 | 7,559 | 0.2% | 100.0% |
| Applewood | CO | 7,160 | 7,160 | 0.2% | 100.0% |
| Dacono | CO | 6,748 | 6,748 | 0.2% | 100.0% |
| Mead | CO | 6,735 | 0 | 0.2% | 0.0% |
| Cherry Hills Village | CO | 6,349 | 6,349 | 0.2% | 100.0% |
| Twin Lakes | CO | 6,101 | 6,101 | 0.2% | 100.0% |
| Sheridan | CO | 5,932 | 5,932 | 0.2% | 100.0% |
| Dove Valley | CO | 5,243 | 5,243 | 0.2% | 100.0% |
| Shaw Heights | CO | 5,116 | 5,116 | 0.2% | 100.0% |
| Edgewater | CO | 4,880 | 4,880 | 0.2% | 100.0% |
| Glendale | CO | 4,465 | 4,465 | 0.1% | 100.0% |
| Glendale | CO | 4,465 | 4,465 | 0.1% | 100.0% |
| Niwot | CO | 4,006 | 4,006 | 0.1% | 100.0% |
| Bennett | CO | 3,916 | 3,916 | 0.1% | 100.0% |
| West Pleasant View | CO | 3,840 | 3,840 | 0.1% | 100.0% |
| Todd Creek | CO | 3,768 | 3,768 | 0.1% | 100.0% |
| Genesee | CO | 3,609 | 3,609 | 0.1% | 100.0% |
| Ponderosa Park | CO | 3,232 | 3,232 | 0.1% | 100.0% |
| Acres Green | CO | 3,007 | 3,007 | 0.1% | 100.0% |
| Meridian | CO | 2,970 | 2,970 | 0.1% | 100.0% |
| Elizabeth | CO | 2,773 | 2,773 | 0.1% | 100.0% |
| Holly Hills | CO | 2,521 | 2,521 | 0.1% | 100.0% |
| Strasburg | CO | 2,447 | 2,447 | 0.1% | 100.0% |
| Lyons | CO | 2,155 | 2,155 | 0.1% | 100.0% |
| Keenesburg | CO | 2,054 | 2,054 | 0.1% | 100.0% |
| Idaho Springs | CO | 1,699 | 1,699 | 0.1% | 100.0% |
| Columbine Valley | CO | 1,683 | 1,683 | 0.1% | 100.0% |
| Perry Park | CO | 1,646 | 1,646 | 0.1% | 100.0% |
| Deer Trail | CO | 1,624 | 1,624 | 0.1% | 100.0% |
| Hudson | CO | 1,617 | 1,617 | 0.1% | 100.0% |
| Inverness | CO | 1,532 | 1,532 | 0.1% | 100.0% |
| Nederland | CO | 1,487 | 1,487 | 0.1% | 100.0% |
| Aristocrat Ranchettes | CO | 1,344 | 1,344 | 0.1% | 100.0% |
| Kittredge | CO | 1,304 | 1,304 | 0.0% | 100.0% |
| Indian Hills | CO | 1,280 | 1,280 | 0.0% | 100.0% |
| Georgetown | CO | 1,257 | 1,257 | 0.0% | 100.0% |
| Byers | CO | 1,160 | 1,160 | 0.0% | 100.0% |
| Upper Bear Creek | CO | 1,059 | 1,059 | 0.0% | 100.0% |
| Floyd Hill | CO | 998 | 998 | 0.0% | 100.0% |
| Pine Brook Hill | CO | 983 | 983 | 0.0% | 100.0% |
| Paragon Estates | CO | 928 | 928 | 0.0% | 100.0% |
| Lazy Acres | CO | 920 | 920 | 0.0% | 100.0% |
| Aspen Park | CO | 882 | 882 | 0.0% | 100.0% |
| Aetna Estates | CO | 834 | 834 | 0.0% | 100.0% |
| Bow Mar | CO | 833 | 833 | 0.0% | 100.0% |
| Foxfield | CO | 744 | 744 | 0.0% | 100.0% |
| Kiowa | CO | 734 | 734 | 0.0% | 100.0% |
| Central City | CO | 663 | 663 | 0.0% | 100.0% |
| Watkins | CO | 653 | 653 | 0.0% | 100.0% |
| Downieville-Lawson-Dumont | CO | 594 | 594 | 0.0% | 100.0% |
| Eldorado Springs | CO | 585 | 585 | 0.0% | 100.0% |
| Grand View Estates | CO | 528 | 528 | 0.0% | 100.0% |
| Allenspark | CO | 528 | 528 | 0.0% | 100.0% |
| Mountain View | CO | 521 | 521 | 0.0% | 100.0% |
| Altona | CO | 501 | 501 | 0.0% | 100.0% |
| North Washington | CO | 484 | 484 | 0.0% | 100.0% |
| Franktown | CO | 395 | 395 | 0.0% | 100.0% |
| Morrison | CO | 394 | 394 | 0.0% | 100.0% |
| Comanche Creek | CO | 369 | 369 | 0.0% | 100.0% |
| Coal Creek | CO | 368 | 368 | 0.0% | 100.0% |
| East Pleasant View | CO | 356 | 356 | 0.0% | 100.0% |
| Empire | CO | 324 | 324 | 0.0% | 100.0% |
| St. Ann Highlands | CO | 288 | 288 | 0.0% | 100.0% |
| St. Mary's | CO | 283 | 283 | 0.0% | 100.0% |
| Mountain Meadows | CO | 274 | 274 | 0.0% | 100.0% |
| Louviers | CO | 269 | 269 | 0.0% | 100.0% |
| Sugarloaf | CO | 261 | 261 | 0.0% | 100.0% |
| Idledale | CO | 252 | 252 | 0.0% | 100.0% |
| Jamestown | CO | 246 | 246 | 0.0% | 100.0% |
| Gold Hill | CO | 230 | 230 | 0.0% | 100.0% |
| Sunshine | CO | 230 | 230 | 0.0% | 100.0% |
| Elbert | CO | 230 | 230 | 0.0% | 100.0% |
| Larkspur | CO | 223 | 223 | 0.0% | 100.0% |
| Bark Ranch | CO | 213 | 213 | 0.0% | 100.0% |
| Tall Timber | CO | 208 | 208 | 0.0% | 100.0% |
| Sedalia | CO | 206 | 206 | 0.0% | 100.0% |
| Silver Plume | CO | 188 | 188 | 0.0% | 100.0% |
| Crisman | CO | 186 | 186 | 0.0% | 100.0% |
| Rollinsville | CO | 181 | 181 | 0.0% | 100.0% |
| Peoria | CO | 163 | 163 | 0.0% | 100.0% |
| Eldora | CO | 142 | 142 | 0.0% | 100.0% |
| Westcreek | CO | 129 | 129 | 0.0% | 100.0% |
| Bonanza Mountain Estates | CO | 128 | 128 | 0.0% | 100.0% |
| Ward | CO | 127 | 127 | 0.0% | 100.0% |
| Seven Hills | CO | 121 | 121 | 0.0% | 100.0% |
| Black Hawk | CO | 120 | 120 | 0.0% | 100.0% |
| Brick Center | CO | 107 | 107 | 0.0% | 100.0% |
| Valmont | CO | 59 | 59 | 0.0% | 100.0% |
| Hidden Lake | CO | 31 | 31 | 0.0% | 100.0% |
| Leyner | CO | 29 | 29 | 0.0% | 100.0% |
| Lakeside | CO | 15 | 15 | 0.0% | 100.0% |
City population is shown in full. The share of each city inside 303 is measured from Census tract centroids, not estimated from a rate-center match – so a city split between two codes appears on both, at the fraction each one actually holds. The “% of listed-city population” column uses the full populations of the cities listed here.
What counties does area code 303 cover?
3,380,487 residents across 13 counties, counted inside the 303 boundary — a county split between codes contributes only its part.
| County | State | Population in 303 | % of area-code footprint | % of County |
|---|---|---|---|---|
| Denver County | CO | 715,522 | 21% | 100% |
| Arapahoe County | CO | 655,070 | 19% | 100% |
| Jefferson County | CO | 582,910 | 17% | 100% |
| Adams County | CO | 519,572 | 15% | 100% |
| Douglas County | CO | 357,978 | 11% | 100% |
| Boulder County | CO | 330,758 | 10% | 100% |
| Weld County | CO | 93,754 | 3% | 28% |
| Broomfield County | CO | 74,112 | 2% | 100% |
| Elbert County | CO | 24,043 | 1% | 92% |
| Park County | CO | 9,762 | 0% | 56% |
| Clear Creek County | CO | 9,397 | 0% | 100% |
| Gilpin County | CO | 5,808 | 0% | 100% |
| Larimer County | CO | 1,801 | 0% | 1% |
Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 303 been reported for unwanted calls?
Yes – 2,691 unwanted-call complaints were reported to the FTC for numbers showing a 303 area code (May 29 – Aug 14, 2026).
- 59% robocalls
- ↑ 23% vs prior period
Most-reported subjects
- Other54%1,459
- Medical & prescriptions12%334
- Home improvement & cleaning9%229
Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-08-17.
Which prefixes and exchanges belong to area code 303?
78% assigned to a telco
- 79% Landline
- 21% Wireless
- 0% Unknown
of 783 | ||
| Prefix | Usage | Carrier |
|---|---|---|
| (303)200- | Landline | Teleport Communications America |
| (303)201- | Wireless | Usa Mobility Wireless |
| (303)202- | Landline | Qwest |
| (303)203- | Landline | American Messaging Services |
| (303)204- | Wireless | Verizon Wireless |
| (303)205- | Landline | Qwest |
| (303)206- | Wireless | Usa Mobility Wireless |
| (303)207- | Wireless | Usa Mobility Wireless |
| (303)208- | Wireless | Usa Mobility Wireless |
| (303)209- | Landline | Mcimetro Access Transmission Services |
| (303)210- | Wireless | T-Mobile Usa |
| (303)212- | Landline | Selectpath Of Colorado |
| (303)213- | Wireless | Usa Mobility Wireless |
| (303)214- | Landline | Mcimetro Access Transmission Services |
| (303)215- | Landline | Qwest |
| (303)216- | Landline | Qwest |
| (303)217- | Landline | Mcimetro Access Transmission Services |
| (303)218- | Landline | Mcimetro Access Transmission Services |
| (303)219- | Landline | Mcimetro Access Transmission Services |
| (303)220- | Landline | Qwest |
| (303)221- | Landline | Qwest |
| (303)222- | Landline | Mcimetro Access Transmission Services |
| (303)223- | Landline | Global Crossing Local Services |
| (303)224- | Landline | Qwest |
| (303)225- | Landline | Global Crossing Local Services |
| (303)226- | Landline | Level 3 Communications |
| (303)227- | Landline | Qwest |
| (303)228- | Landline | Level 3 Communications |
| (303)229- | Wireless | Verizon Wireless |
| (303)230- | Wireless | Usa Mobility Wireless |
| (303)231- | Landline | Qwest |
| (303)232- | Landline | Qwest |
| (303)233- | Landline | Qwest |
| (303)234- | Landline | Qwest |
| (303)235- | Landline | Qwest |
| (303)236- | Landline | Qwest |
| (303)237- | Landline | Qwest |
| (303)238- | Landline | Qwest |
| (303)239- | Landline | Qwest |
| (303)240- | Wireless | Usa Mobility Wireless |
| (303)241- | Wireless | Verizon Wireless |
| (303)242- | Landline | Mcimetro Access Transmission Services |
| (303)243- | Wireless | N.E. Colorado Cellular |
| (303)244- | Landline | Qwest |
| (303)245- | Landline | Qwest |
| (303)246- | Wireless | T-Mobile Usa |
| (303)247- | Landline | Qwest |
| (303)248- | Landline | Teleport Communications America |
| (303)249- | Wireless | New Cingular Wireless Pcs |
| (303)250- | Wireless | New Cingular Wireless Pcs |
| (303)251- | Wireless | Usa Mobility Wireless |
| (303)252- | Landline | Qwest |
| (303)253- | Landline | Teleport Communications America |
| (303)254- | Landline | Qwest |
| (303)255- | Landline | Qwest |
| (303)256- | Landline | Teleport Communications America |
| (303)257- | Wireless | T-Mobile Usa |
| (303)258- | Landline | Qwest |
| (303)259- | Landline | American Messaging Services |
| (303)260- | Landline | Qwest |
| (303)261- | Landline | Qwest |
| (303)262- | Landline | Teleport Communications America |
| (303)263- | Wireless | Verizon Wireless |
| (303)264- | Landline | Teleport Communications America |
| (303)265- | Landline | Qwest |
| (303)266- | Wireless | Usa Mobility Wireless |
| (303)267- | Landline | Qwest |
| (303)268- | Landline | Level 3 Communications |
| (303)269- | Landline | Qwest |
| (303)270- | Landline | Qwest |
| (303)271- | Landline | Qwest |
| (303)272- | Landline | Qwest |
| (303)273- | Landline | Qwest |
| (303)274- | Landline | Qwest |
| (303)275- | Landline | Qwest |
| (303)276- | Landline | Onvoy |
| (303)277- | Landline | Qwest |
| (303)278- | Landline | Qwest |
| (303)279- | Landline | Qwest |
| (303)280- | Landline | Qwest |
| (303)281- | Landline | Qwest |
| (303)282- | Landline | Qwest |
| (303)283- | Landline | Qwest |
| (303)284- | Landline | Comcast Ip Phone |
| (303)285- | Landline | Level 3 Communications |
| (303)286- | Landline | Qwest |
| (303)287- | Landline | Qwest |
| (303)288- | Landline | Qwest |
| (303)289- | Landline | Qwest |
| (303)290- | Landline | Qwest |
| (303)291- | Landline | Qwest |
| (303)292- | Landline | Qwest |
| (303)293- | Landline | Qwest |
| (303)294- | Landline | Qwest |
| (303)295- | Landline | Qwest |
| (303)296- | Landline | Qwest |
| (303)297- | Landline | Qwest |
| (303)298- | Landline | Qwest |
| (303)299- | Landline | Qwest |
| (303)300- | Landline | Qwest |
| (303)301- | Landline | Level 3 Communications |
| (303)302- | Landline | Xo Colorado |
| (303)304- | Wireless | New Cingular Wireless Pcs |
| (303)305- | Landline | Mcimetro Access Transmission Services |
| (303)306- | Landline | Qwest |
| (303)307- | Landline | Qwest |
| (303)308- | Landline | Qwest |
| (303)309- | Landline | Global Crossing Local Services |
| (303)310- | Landline | Selectpath Of Colorado |
| (303)312- | Landline | Qwest |
| (303)313- | Landline | Qwest |
| (303)314- | Landline | Qwest |
| (303)315- | Landline | Qwest |
| (303)316- | Landline | Qwest |
| (303)317- | Landline | Qwest |
| (303)318- | Landline | Qwest |
| (303)319- | Wireless | Elbert County Wireless |
| (303)320- | Landline | Qwest |
| (303)321- | Landline | Qwest |
| (303)322- | Landline | Qwest |
| (303)323- | Landline | Mcimetro Access Transmission Services |
| (303)324- | Wireless | New Cingular Wireless Pcs |
| (303)325- | Landline | Level 3 Communications |
| (303)326- | Landline | Qwest |
| (303)327- | Landline | Level 3 Communications |
| (303)328- | Landline | Mcimetro Access Transmission Services |
| (303)329- | Landline | Qwest |
| (303)330- | Landline | Onvoy |
| (303)331- | Landline | Qwest |
| (303)332- | Wireless | T-Mobile Usa |
| (303)333- | Landline | Qwest |
| (303)334- | Landline | Mcimetro Access Transmission Services |
| (303)335- | Wireless | Verizon Wireless |
| (303)336- | Landline | Qwest |
| (303)337- | Landline | Qwest |
| (303)338- | Landline | Qwest |
| (303)339- | Landline | Onvoy |
| (303)340- | Landline | Qwest |
| (303)341- | Landline | Qwest |
| (303)342- | Landline | Qwest |
| (303)343- | Landline | Qwest |
| (303)344- | Landline | Qwest |
| (303)345- | Landline | Level 3 Communications |
| (303)346- | Landline | Qwest |
| (303)347- | Landline | Qwest |
| (303)348- | Landline | Qwest |
| (303)349- | Wireless | Verizon Wireless |
| (303)350- | Wireless | New Cingular Wireless Pcs |
| (303)351- | Landline | Onvoy |
| (303)352- | Landline | Qwest |
| (303)353- | Landline | Comcast Ip Phone |
| (303)354- | Landline | Teleport Communications America |
| (303)355- | Landline | Qwest |
| (303)356- | Wireless | T-Mobile Usa |
| (303)357- | Landline | Mcimetro Access Transmission Services |
| (303)358- | Wireless | Verizon Wireless |
| (303)359- | Wireless | T-Mobile Usa |
| (303)360- | Landline | Qwest |
| (303)361- | Landline | Qwest |
| (303)362- | Landline | Teleport Communications America |
| (303)363- | Landline | Qwest |
| (303)364- | Landline | Qwest |
| (303)365- | Landline | Qwest |
| (303)366- | Landline | Qwest |
| (303)367- | Landline | Qwest |
| (303)368- | Landline | Qwest |
| (303)369- | Landline | Qwest |
| (303)370- | Landline | Qwest |
| (303)371- | Landline | Qwest |
| (303)372- | Landline | Qwest |
| (303)373- | Landline | Qwest |
| (303)374- | Landline | Teleport Communications America |
| (303)375- | Landline | Qwest |
| (303)376- | Landline | Level 3 Communications |
| (303)377- | Landline | Qwest |
| (303)378- | Wireless | New Cingular Wireless Pcs |
| (303)379- | Landline | Teleport Communications America |
| (303)380- | Landline | Qwest |
| (303)381- | Landline | Level 3 Communications |
| (303)382- | Landline | Qwest |
| (303)383- | Landline | Qwest |
| (303)384- | Landline | Qwest |
| (303)385- | Landline | Level 3 Communications |
| (303)386- | Landline | Level 3 Communications |
| (303)387- | Landline | Qwest |
| (303)388- | Landline | Qwest |
| (303)389- | Landline | Qwest |
| (303)390- | Landline | Mcimetro Access Transmission Services |
| (303)391- | Landline | Qwest |
| (303)392- | Landline | Selectpath Of Colorado |
| (303)393- | Landline | Qwest |
| (303)394- | Landline | Qwest |
| (303)395- | Landline | Global Crossing Local Services |
| (303)396- | Landline | Live Wire Networks |
| (303)397- | Landline | Qwest |
| (303)398- | Landline | Qwest |
| (303)399- | Landline | Qwest |
| (303)400- | Landline | Qwest |
| (303)401- | Landline | Qwest |
| (303)402- | Landline | Qwest |
| (303)403- | Landline | Qwest |
| (303)404- | Landline | Qwest |
| (303)405- | Landline | Qwest |
| (303)406- | Landline | Level 3 Communications |
| (303)407- | Landline | Onvoy |
| (303)408- | Wireless | New Cingular Wireless Pcs |
| (303)409- | Landline | Level 3 Communications |
| (303)410- | Landline | Qwest |
| (303)412- | Landline | Qwest |
| (303)413- | Landline | Qwest |
| (303)414- | Landline | Level 3 Communications |
| (303)415- | Landline | Qwest |
| (303)416- | Landline | Global Crossing Local Services |
| (303)417- | Landline | Qwest |
| (303)418- | Landline | Level 3 Communications |
| (303)419- | Wireless | T-Mobile Usa |
| (303)420- | Landline | Qwest |
| (303)421- | Landline | Qwest |
| (303)422- | Landline | Qwest |
| (303)423- | Landline | Qwest |
| (303)424- | Landline | Qwest |
| (303)425- | Landline | Qwest |
| (303)426- | Landline | Qwest |
| (303)427- | Landline | Qwest |
| (303)428- | Landline | Qwest |
| (303)429- | Landline | Qwest |
| (303)430- | Landline | Qwest |
| (303)431- | Landline | Qwest |
| (303)432- | Landline | Qwest |
| (303)433- | Landline | Qwest |
| (303)434- | Wireless | T-Mobile Usa |
| (303)435- | Wireless | T-Mobile Usa |
| (303)436- | Landline | Qwest |
| (303)437- | Wireless | T-Mobile Usa |
| (303)438- | Landline | Qwest |
| (303)439- | Landline | Qwest |
| (303)440- | Landline | Qwest |
| (303)441- | Landline | Qwest |
| (303)442- | Landline | Qwest |
| (303)443- | Landline | Qwest |
| (303)444- | Landline | Qwest |
| (303)445- | Landline | Qwest |
| (303)446- | Landline | Qwest |
| (303)447- | Landline | Qwest |
| (303)448- | Landline | Qwest |
| (303)449- | Landline | Qwest |
| (303)450- | Landline | Qwest |
| (303)451- | Landline | Qwest |
| (303)452- | Landline | Qwest |
| (303)453- | Landline | Qwest |
| (303)454- | Landline | Qwest |
| (303)455- | Landline | Qwest |
| (303)456- | Landline | Qwest |
| (303)457- | Landline | Qwest |
| (303)458- | Landline | Qwest |
| (303)459- | Landline | Qwest |
| (303)460- | Landline | Qwest |
| (303)461- | Wireless | Usa Mobility Wireless |
| (303)462- | Landline | Qwest |
| (303)463- | Landline | Qwest |
| (303)464- | Landline | Qwest |
| (303)465- | Landline | Qwest |
| (303)466- | Landline | Qwest |
| (303)467- | Landline | Qwest |
| (303)468- | Landline | Onvoy |
| (303)469- | Landline | Qwest |
| (303)470- | Landline | Qwest |
| (303)471- | Landline | Qwest |
| (303)472- | Wireless | T-Mobile Usa |
| (303)473- | Landline | Qwest |
| (303)474- | Landline | Teleport Communications America |
| (303)475- | Wireless | New Cingular Wireless Pcs |
| (303)476- | Landline | Mcimetro Access Transmission Services |
| (303)477- | Landline | Qwest |
| (303)478- | Wireless | New Cingular Wireless Pcs |
| (303)479- | Landline | Teleport Communications America |
| (303)480- | Landline | Qwest |
| (303)481- | Landline | Mcimetro Access Transmission Services |
| (303)482- | Landline | Global Crossing Local Services |
| (303)483- | Landline | Level 3 Communications |
| (303)484- | Landline | Teleport Communications America |
| (303)485- | Landline | Qwest |
| (303)486- | Landline | Qwest |
| (303)487- | Landline | Qwest |
| (303)488- | Landline | Qwest |
| (303)489- | Wireless | Verizon Wireless |
| (303)490- | Wireless | Usa Mobility Wireless |
| (303)491- | Landline | Onvoy Spectrum |
| (303)492- | Landline | Qwest |
| (303)493- | Landline | Level 3 Communications |
| (303)494- | Landline | Qwest |
| (303)495- | Landline | Mcimetro Access Transmission Services |
| (303)496- | Landline | Xo Colorado |
| (303)497- | Landline | Qwest |
| (303)498- | Landline | Comcast Ip Phone |
| (303)499- | Landline | Qwest |
| (303)500- | Landline | Level 3 Communications |
| (303)501- | Wireless | Verizon Wireless |
| (303)502- | Wireless | Verizon Wireless |
| (303)503- | Wireless | Verizon Wireless |
| (303)504- | Landline | Qwest |
| (303)505- | Wireless | T-Mobile Usa |
| (303)506- | Wireless | New Cingular Wireless Pcs |
| (303)507- | Wireless | T-Mobile Usa |
| (303)508- | Landline | American Messaging Services |
| (303)509- | Landline | American Messaging Services |
| (303)510- | Landline | American Messaging Services |
| (303)512- | Landline | Qwest |
| (303)513- | Wireless | New Cingular Wireless Pcs |
| (303)514- | Wireless | Verizon Wireless |
| (303)515- | Landline | Onvoy |
| (303)516- | Landline | Qwest |
| (303)517- | Wireless | New Cingular Wireless Pcs |
| (303)518- | Wireless | Verizon Wireless |
| (303)519- | Wireless | Verizon Wireless |
| (303)520- | Wireless | T-Mobile Usa |
| (303)521- | Wireless | T-Mobile Usa |
| (303)522- | Wireless | T-Mobile Usa |
| (303)523- | Wireless | T-Mobile Usa |
| (303)524- | Landline | Teleport Communications America |
| (303)525- | Wireless | T-Mobile Usa |
| (303)526- | Landline | Qwest |
| (303)527- | Landline | Qwest |
| (303)528- | Landline | American Messaging Services |
| (303)529- | Landline | Onvoy |
| (303)530- | Landline | Qwest |
| (303)531- | Landline | Mcimetro Access Transmission Services |
| (303)532- | Landline | Mcleodusa Telecommunication Services |
| (303)533- | Landline | Qwest |
| (303)534- | Landline | Qwest |
| (303)535- | Landline | Onvoy |
| (303)536- | Landline | Qwest |
| (303)537- | Landline | Teleport Communications America |
| (303)538- | Landline | Qwest |
| (303)539- | Landline | Xo Colorado |
| (303)540- | Wireless | Usa Mobility Wireless |
| (303)541- | Landline | Qwest |
| (303)542- | Landline | Mcimetro Access Transmission Services |
| (303)543- | Landline | Qwest |
| (303)544- | Landline | Qwest |
| (303)545- | Landline | Qwest |
| (303)546- | Landline | Qwest |
| (303)547- | Landline | Global Crossing Local Services |
| (303)548- | Wireless | Verizon Wireless |
| (303)549- | Wireless | Verizon Wireless |
| (303)550- | Wireless | Verizon Wireless |
| (303)551- | Landline | Mcimetro Access Transmission Services |
| (303)552- | Landline | Global Crossing Local Services |
| (303)553- | Wireless | Usa Mobility Wireless |
| (303)554- | Landline | Qwest |
| (303)556- | Landline | Qwest |
| (303)557- | Landline | Global Crossing Local Services |
| (303)558- | Landline | Global Crossing Local Services |
| (303)559- | Landline | American Messaging Services |
| (303)560- | Wireless | Usa Mobility Wireless |
| (303)561- | Landline | Qwest |
| (303)562- | Landline | Global Crossing Local Services |
| (303)563- | Landline | Level 3 Communications |
| (303)564- | Wireless | T-Mobile Usa |
| (303)565- | Landline | Onvoy |
| (303)566- | Landline | Mcimetro Access Transmission Services |
| (303)567- | Landline | Qwest |
| (303)568- | Landline | Teleport Communications America |
| (303)569- | Landline | Qwest |
| (303)570- | Wireless | New Cingular Wireless Pcs |
| (303)571- | Landline | Qwest |
| (303)572- | Landline | Qwest |
| (303)573- | Landline | Qwest |
| (303)574- | Landline | Qwest |
| (303)575- | Landline | Qwest |
| (303)576- | Landline | Qwest |
| (303)577- | Landline | Allstream |
| (303)578- | Landline | Level 3 Communications |
| (303)579- | Wireless | Verizon Wireless |
| (303)580- | Landline | American Messaging Services |
| (303)581- | Landline | Qwest |
| (303)582- | Landline | Qwest |
| (303)583- | Landline | Teleport Communications America |
| (303)584- | Landline | Qwest |
| (303)585- | Landline | Qwest |
| (303)586- | Landline | Level 3 Communications |
| (303)587- | Wireless | T-Mobile Usa |
| (303)588- | Wireless | New Cingular Wireless Pcs |
| (303)589- | Wireless | New Cingular Wireless Pcs |
| (303)590- | Landline | Level 3 Communications |
| (303)591- | Wireless | T-Mobile Usa |
| (303)592- | Landline | Qwest |
| (303)593- | Landline | Teleport Communications America |
| (303)594- | Wireless | Verizon Wireless |
| (303)595- | Landline | Qwest |
| (303)596- | Wireless | T-Mobile Usa |
| (303)597- | Landline | Allstream |
| (303)598- | Wireless | T-Mobile Usa |
| (303)599- | Wireless | Usa Mobility Wireless |
| (303)600- | Landline | Teleport Communications America |
| (303)601- | Wireless | New Cingular Wireless Pcs |
| (303)602- | Landline | Qwest |
| (303)603- | Landline | Qwest |
| (303)604- | Landline | Qwest |
| (303)605- | Landline | Qwest |
| (303)606- | Landline | Qwest |
| (303)607- | Landline | Qwest |
| (303)608- | Landline | Qwest |
| (303)609- | Wireless | Usa Mobility Wireless |
| (303)610- | Wireless | Usa Mobility Wireless |
| (303)612- | Wireless | Usa Mobility Wireless |
| (303)613- | Wireless | Usa Mobility Wireless |
| (303)614- | Landline | Qwest |
| (303)615- | Landline | Qwest |
| (303)616- | Landline | Onvoy Spectrum |
| (303)617- | Landline | Qwest |
| (303)618- | Wireless | New Cingular Wireless Pcs |
| (303)619- | Wireless | New Cingular Wireless Pcs |
| (303)620- | Landline | Qwest |
| (303)621- | Landline | Qwest |
| (303)622- | Landline | Strasburg Tel. Co. |
| (303)623- | Landline | Qwest |
| (303)624- | Landline | Qwest |
| (303)625- | Landline | Level 3 Communications |
| (303)626- | Landline | Qwest |
| (303)627- | Landline | Qwest |
| (303)628- | Landline | Qwest |
| (303)629- | Landline | Qwest |
| (303)630- | Landline | Qwest |
| (303)632- | Landline | Teleport Communications America |
| (303)633- | Landline | Qwest |
| (303)634- | Landline | Qwest |
| (303)635- | Landline | Qwest |
| (303)636- | Landline | Qwest |
| (303)637- | Landline | Qwest |
| (303)638- | Wireless | New Cingular Wireless Pcs |
| (303)639- | Landline | Qwest |
| (303)640- | Landline | Qwest |
| (303)641- | Wireless | T-Mobile Usa |
| (303)642- | Landline | Qwest |
| (303)643- | Landline | Qwest |
| (303)644- | Landline | Eastern Slope Rural Tel. Assn. |
| (303)645- | Landline | Qwest |
| (303)646- | Landline | Qwest |
| (303)647- | Landline | Qwest |
| (303)648- | Landline | Qwest |
| (303)649- | Landline | Qwest |
| (303)650- | Landline | Qwest |
| (303)651- | Landline | Qwest |
| (303)652- | Landline | Qwest |
| (303)653- | Landline | Level 3 Communications |
| (303)654- | Landline | Qwest |
| (303)655- | Landline | Qwest |
| (303)656- | Wireless | Verizon Wireless |
| (303)657- | Landline | Qwest |
| (303)658- | Landline | Qwest |
| (303)659- | Landline | Qwest |
| (303)660- | Landline | Qwest |
| (303)661- | Landline | Qwest |
| (303)662- | Landline | Qwest |
| (303)663- | Landline | Qwest |
| (303)664- | Landline | Qwest |
| (303)665- | Landline | Qwest |
| (303)666- | Landline | Qwest |
| (303)667- | Wireless | T-Mobile Usa |
| (303)668- | Wireless | T-Mobile Usa |
| (303)669- | Wireless | T-Mobile Usa |
| (303)670- | Landline | Qwest |
| (303)671- | Landline | Qwest |
| (303)672- | Landline | Qwest |
| (303)673- | Landline | Qwest |
| (303)674- | Landline | Qwest |
| (303)675- | Landline | Qwest |
| (303)676- | Landline | Qwest |
| (303)677- | Landline | Qwest |
| (303)678- | Landline | Qwest |
| (303)679- | Landline | Qwest |
| (303)680- | Landline | Qwest |
| (303)681- | Landline | Qwest |
| (303)682- | Landline | Qwest |
| (303)683- | Landline | Qwest |
| (303)684- | Landline | Qwest |
| (303)685- | Landline | Qwest |
| (303)686- | Wireless | Usa Mobility Wireless |
| (303)687- | Wireless | Usa Mobility Wireless |
| (303)688- | Landline | Qwest |
| (303)689- | Landline | Qwest |
| (303)690- | Landline | Qwest |
| (303)691- | Landline | Qwest |
| (303)692- | Landline | Qwest |
| (303)693- | Landline | Qwest |
| (303)694- | Landline | Qwest |
| (303)695- | Landline | Qwest |
| (303)696- | Landline | Qwest |
| (303)697- | Landline | Qwest |
| (303)698- | Landline | Qwest |
| (303)699- | Landline | Qwest |
| (303)701- | Landline | Communications Unlimited |
| (303)702- | Landline | Qwest |
| (303)703- | Landline | Qwest |
| (303)704- | Landline | Mcimetro Access Transmission Services |
| (303)705- | Landline | Qwest |
| (303)706- | Landline | Qwest |
| (303)707- | Landline | Qwest |
| (303)708- | Landline | Qwest |
| (303)709- | Wireless | Verizon Wireless |
| (303)710- | Wireless | Verizon Wireless |
| (303)712- | Landline | Qwest |
| (303)713- | Landline | Qwest |
| (303)714- | Landline | Qwest |
| (303)715- | Landline | Qwest |
| (303)716- | Landline | Qwest |
| (303)717- | Wireless | New Cingular Wireless Pcs |
| (303)718- | Wireless | Verizon Wireless |
| (303)719- | Landline | Ymax Communications |
| (303)720- | Wireless | Verizon Wireless |
| (303)721- | Landline | Qwest |
| (303)722- | Landline | Qwest |
| (303)723- | Landline | Teleport Communications America |
| (303)724- | Landline | Qwest |
| (303)725- | Wireless | T-Mobile Usa |
| (303)726- | Wireless | Verizon Wireless |
| (303)727- | Landline | Qwest |
| (303)728- | Landline | Teleport Communications America |
| (303)729- | Landline | Mcimetro Access Transmission Services |
| (303)730- | Landline | Qwest |
| (303)731- | Landline | Level 3 Communications |
| (303)732- | Landline | Qwest |
| (303)733- | Landline | Qwest |
| (303)734- | Landline | Qwest |
| (303)735- | Landline | Qwest |
| (303)736- | Landline | Teleport Communications America |
| (303)737- | Landline | Qwest |
| (303)738- | Landline | Qwest |
| (303)739- | Landline | Qwest |
| (303)740- | Landline | Qwest |
| (303)741- | Landline | Qwest |
| (303)742- | Landline | Qwest |
| (303)743- | Landline | Qwest |
| (303)744- | Landline | Qwest |
| (303)745- | Landline | Qwest |
| (303)746- | Wireless | Verizon Wireless |
| (303)747- | Landline | Qwest |
| (303)748- | Wireless | New Cingular Wireless Pcs |
| (303)749- | Landline | Teleport Communications America |
| (303)750- | Landline | Qwest |
| (303)751- | Landline | Qwest |
| (303)752- | Landline | Qwest |
| (303)753- | Landline | Qwest |
| (303)754- | Landline | Qwest |
| (303)755- | Landline | Qwest |
| (303)756- | Landline | Qwest |
| (303)757- | Landline | Qwest |
| (303)758- | Landline | Qwest |
| (303)759- | Landline | Qwest |
| (303)760- | Wireless | Usa Mobility Wireless |
| (303)761- | Landline | Qwest |
| (303)762- | Landline | Qwest |
| (303)763- | Landline | Qwest |
| (303)764- | Landline | Qwest |
| (303)765- | Landline | Qwest |
| (303)766- | Landline | Qwest |
| (303)767- | Landline | Selectpath Of Colorado |
| (303)768- | Landline | Qwest |
| (303)769- | Landline | Bijou Tel. Coop. Assn. |
| (303)770- | Landline | Qwest |
| (303)771- | Landline | Qwest |
| (303)772- | Landline | Qwest |
| (303)773- | Landline | Qwest |
| (303)774- | Landline | Qwest |
| (303)775- | Wireless | Verizon Wireless |
| (303)776- | Landline | Qwest |
| (303)777- | Landline | Qwest |
| (303)778- | Landline | Qwest |
| (303)779- | Landline | Qwest |
| (303)780- | Landline | Qwest |
| (303)781- | Landline | Qwest |
| (303)782- | Landline | Qwest |
| (303)783- | Landline | Qwest |
| (303)784- | Landline | Qwest |
| (303)785- | Landline | Xo Colorado |
| (303)786- | Landline | Qwest |
| (303)787- | Landline | Qwest |
| (303)788- | Landline | Qwest |
| (303)789- | Landline | Qwest |
| (303)790- | Landline | Qwest |
| (303)791- | Landline | Qwest |
| (303)792- | Landline | Qwest |
| (303)793- | Landline | Qwest |
| (303)794- | Landline | Qwest |
| (303)795- | Landline | Qwest |
| (303)796- | Landline | Qwest |
| (303)797- | Landline | Qwest |
| (303)798- | Landline | Qwest |
| (303)799- | Landline | Qwest |
| (303)800- | Landline | Level 3 Communications |
| (303)801- | Landline | Mcimetro Access Transmission Services |
| (303)802- | Landline | Level 3 Telecom Of Colorado |
| (303)803- | Landline | Level 3 Telecom Of Colorado |
| (303)804- | Landline | Qwest |
| (303)805- | Landline | Qwest |
| (303)806- | Landline | Qwest |
| (303)807- | Wireless | New Cingular Wireless Pcs |
| (303)808- | Wireless | New Cingular Wireless Pcs |
| (303)809- | Wireless | New Cingular Wireless Pcs |
| (303)810- | Wireless | New Cingular Wireless Pcs |
| (303)812- | Landline | Qwest |
| (303)813- | Landline | Qwest |
| (303)814- | Landline | Qwest |
| (303)815- | Landline | Forethought.Net |
| (303)816- | Landline | Qwest |
| (303)817- | Wireless | Verizon Wireless |
| (303)818- | Wireless | Verizon Wireless |
| (303)819- | Wireless | Verizon Wireless |
| (303)820- | Landline | Qwest |
| (303)821- | Wireless | Usa Mobility Wireless |
| (303)822- | Landline | Bijou Tel. Coop. Assn. |
| (303)823- | Landline | Qwest |
| (303)824- | Landline | Teleport Communications America |
| (303)825- | Landline | Qwest |
| (303)826- | Wireless | Usa Mobility Wireless |
| (303)827- | Landline | Level 3 Communications |
| (303)828- | Landline | Qwest |
| (303)829- | Wireless | Verizon Wireless |
| (303)830- | Landline | Qwest |
| (303)831- | Landline | Qwest |
| (303)832- | Landline | Qwest |
| (303)833- | Landline | Qwest |
| (303)834- | Wireless | Verizon Wireless |
| (303)835- | Landline | Level 3 Communications |
| (303)836- | Landline | Communications Unlimited |
| (303)837- | Landline | Qwest |
| (303)838- | Landline | Qwest |
| (303)839- | Landline | Qwest |
| (303)840- | Landline | Qwest |
| (303)841- | Landline | Qwest |
| (303)842- | Wireless | Verizon Wireless |
| (303)843- | Landline | Qwest |
| (303)844- | Landline | Qwest |
| (303)845- | Landline | Teleport Communications America |
| (303)846- | Landline | Qwest |
| (303)847- | Landline | Level 3 Communications |
| (303)848- | Landline | Level 3 Communications |
| (303)849- | Landline | Roggen Tel. Coop. Co. |
| (303)850- | Landline | Qwest |
| (303)851- | Wireless | Usa Mobility Wireless |
| (303)852- | Wireless | Usa Mobility Wireless |
| (303)853- | Landline | Qwest |
| (303)854- | Landline | Level 3 Communications |
| (303)855- | Wireless | Usa Mobility Wireless |
| (303)856- | Landline | Level 3 Communications |
| (303)857- | Landline | Qwest |
| (303)858- | Landline | Qwest |
| (303)859- | Wireless | Verizon Wireless |
| (303)860- | Landline | Qwest |
| (303)861- | Landline | Qwest |
| (303)862- | Landline | Comcast Ip Phone |
| (303)863- | Landline | Qwest |
| (303)864- | Landline | Qwest |
| (303)865- | Landline | Level 3 Communications |
| (303)866- | Landline | Qwest |
| (303)867- | Landline | Newcloud Networks |
| (303)868- | Wireless | Verizon Wireless |
| (303)869- | Landline | Qwest |
| (303)870- | Wireless | Verizon Wireless |
| (303)871- | Landline | Qwest |
| (303)872- | Landline | Level 3 Communications |
| (303)873- | Landline | Qwest |
| (303)874- | Landline | Level 3 Communications |
| (303)875- | Wireless | T-Mobile Usa |
| (303)876- | Landline | Mcimetro Access Transmission Services |
| (303)877- | Wireless | Verizon Wireless |
| (303)878- | Wireless | Usa Mobility Wireless |
| (303)879- | Wireless | Usa Mobility Wireless |
| (303)880- | Wireless | Verizon Wireless |
| (303)881- | Wireless | New Cingular Wireless Pcs |
| (303)882- | Wireless | New Cingular Wireless Pcs |
| (303)883- | Wireless | New Cingular Wireless Pcs |
| (303)884- | Wireless | New Cingular Wireless Pcs |
| (303)885- | Wireless | New Cingular Wireless Pcs |
| (303)886- | Wireless | New Cingular Wireless Pcs |
| (303)887- | Wireless | New Cingular Wireless Pcs |
| (303)888- | Wireless | New Cingular Wireless Pcs |
| (303)889- | Landline | Qwest |
| (303)890- | Wireless | Usa Mobility Wireless |
| (303)891- | Wireless | Usa Mobility Wireless |
| (303)892- | Landline | Qwest |
| (303)893- | Landline | Qwest |
| (303)894- | Landline | Qwest |
| (303)895- | Wireless | Verizon Wireless |
| (303)896- | Landline | Qwest |
| (303)897- | Wireless | Usa Mobility Wireless |
| (303)898- | Wireless | New Cingular Wireless Pcs |
| (303)899- | Landline | Qwest |
| (303)900- | Landline | Level 3 Communications |
| (303)901- | Wireless | T-Mobile Usa |
| (303)902- | Wireless | Verizon Wireless |
| (303)903- | Wireless | Verizon Wireless |
| (303)904- | Landline | Qwest |
| (303)905- | Wireless | Verizon Wireless |
| (303)906- | Wireless | Verizon Wireless |
| (303)907- | Wireless | Verizon Wireless |
| (303)908- | Wireless | Verizon Wireless |
| (303)909- | Wireless | Verizon Wireless |
| (303)910- | Wireless | Verizon Wireless |
| (303)912- | Wireless | Verizon Wireless |
| (303)913- | Wireless | Verizon Wireless |
| (303)914- | Landline | Qwest |
| (303)915- | Wireless | Verizon Wireless |
| (303)916- | Wireless | Verizon Wireless |
| (303)917- | Wireless | Verizon Wireless |
| (303)918- | Wireless | Verizon Wireless |
| (303)919- | Wireless | Verizon Wireless |
| (303)920- | Landline | Qwest |
| (303)921- | Wireless | Verizon Wireless |
| (303)922- | Landline | Qwest |
| (303)923- | Landline | Level 3 Communications |
| (303)924- | Landline | Qwest |
| (303)925- | Landline | Qwest |
| (303)926- | Landline | Qwest |
| (303)927- | Landline | Teleport Communications America |
| (303)928- | Landline | Mcimetro Access Transmission Services |
| (303)929- | Wireless | Verizon Wireless |
| (303)930- | Landline | Qwest |
| (303)931- | Wireless | T-Mobile Usa |
| (303)932- | Landline | Qwest |
| (303)933- | Landline | Qwest |
| (303)934- | Landline | Qwest |
| (303)935- | Landline | Qwest |
| (303)936- | Landline | Qwest |
| (303)937- | Landline | Qwest |
| (303)938- | Landline | Qwest |
| (303)939- | Landline | Qwest |
| (303)940- | Landline | Qwest |
| (303)941- | Wireless | Verizon Wireless |
| (303)942- | Landline | Teleport Communications America |
| (303)943- | Landline | Skyetel |
| (303)944- | Wireless | T-Mobile Usa |
| (303)945- | Landline | Comcast Ip Phone |
| (303)946- | Wireless | T-Mobile Usa |
| (303)947- | Wireless | Verizon Wireless |
| (303)948- | Landline | Qwest |
| (303)949- | Wireless | T-Mobile Usa |
| (303)951- | Landline | Level 3 Communications |
| (303)952- | Landline | Level 3 Communications |
| (303)953- | Landline | Level 3 Communications |
| (303)954- | Landline | Level 3 Communications |
| (303)955- | Landline | Global Crossing Local Services |
| (303)956- | Wireless | New Cingular Wireless Pcs |
| (303)957- | Landline | Global Crossing Local Services |
| (303)960- | Wireless | T-Mobile Usa |
| (303)961- | Wireless | T-Mobile Usa |
| (303)962- | Landline | Onvoy |
| (303)963- | Landline | Level 3 Communications |
| (303)964- | Landline | Qwest |
| (303)965- | Landline | Qwest |
| (303)966- | Landline | Qwest |
| (303)967- | Landline | Qwest |
| (303)968- | Landline | Mcimetro Access Transmission Services |
| (303)969- | Landline | Qwest |
| (303)970- | Landline | Onvoy |
| (303)971- | Landline | Qwest |
| (303)972- | Landline | Qwest |
| (303)973- | Landline | Qwest |
| (303)974- | Landline | Global Crossing Local Services |
| (303)975- | Landline | Qwest |
| (303)977- | Landline | Qwest |
| (303)978- | Landline | Qwest |
| (303)979- | Landline | Qwest |
| (303)980- | Landline | Qwest |
| (303)981- | Wireless | Verizon Wireless |
| (303)982- | Landline | Qwest |
| (303)984- | Landline | Qwest |
| (303)985- | Landline | Qwest |
| (303)986- | Landline | Qwest |
| (303)987- | Landline | Qwest |
| (303)988- | Landline | Qwest |
| (303)989- | Landline | Qwest |
| (303)990- | Wireless | T-Mobile Usa |
| (303)991- | Landline | Xo Colorado |
| (303)992- | Landline | Qwest |
| (303)993- | Landline | Onvoy |
| (303)994- | Wireless | T-Mobile Usa |
| (303)995- | Wireless | T-Mobile Usa |
| (303)996- | Landline | Allstream |
| (303)997- | Landline | Comcast Ip Phone |
| (303)998- | Landline | Qwest |
| (303)999- | Landline | Comcast Ip Phone |
| No prefixes match “”. | ||
Frequently Asked Questions about the 303 Area Code
Who called me from a 303 number?
A 303 number is assigned to Denver, Colorado, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 303 code to look nearby, so a 303 number doesn't prove the caller is local. Recently, 2,691 unwanted-call complaints were reported to the FTC for numbers showing the 303 code (59% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 303 a scam area code?
No area code is a scam on its own. 303 is a normal, officially assigned code for Denver, Colorado. Spam callers spoof local codes to raise the odds you answer, so 303 on your caller ID says nothing about who is really calling. Recently, 2,691 unwanted-call complaints were reported to the FTC for numbers showing the 303 code (59% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 303 area code?
Repeated calls from different 303 numbers are usually spoofing: a robocaller rotates through 303 numbers so each call looks local and slips past simple blocks. Recently, 2,691 unwanted-call complaints were reported to the FTC for numbers showing the 303 code (59% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 303 number?
If you aren't expecting a 303 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 303 area code?
Block a single 303 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 303 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 303?
Area code 303 covers Denver and the surrounding area in Colorado, spanning 137 cities with about 3,380,487 residents. It shares its area with overlay codes 720, 983.
When did area code 303 go into service?
Area code 303 went into service on January 1, 1947. Overlay codes 720, 983 now share its territory.
Is 303 a real area code?
Yes. 303 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Denver, Colorado. A real code can still show up on spoofed spam calls, so treat unknown 303 calls with normal caution.
What timezone is the 303 area code in?
The 303 area code is in the Mountain Time (MT). Because a number can be kept when someone moves or switches to VoIP, a specific 303 caller may not be in that zone.
How do I call a 303 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 303 and the seven-digit number. From a mobile phone you can usually just enter +1 303 followed by the number and let the phone add the exit code for you.