303 Area CodeDenver, CO
Area code 303 covers Denver and 136 other cities in Colorado: 3,380,487 people in 13 counties, led by Denver and Arapahoe, on Mountain Time (MT). It overlays 720 and 983.
Overview
- Major City
- Denver
- State
- Colorado (CO)
- Timezone
- Mountain Time (MT)
- Current Time
- –:––
- Overlay
- Yes – shares area with 720, 983
Where is area code 303?
Overview of the 303 Area Code
Geographic Coverage of the 303 Area Code
All 137 cities- 729,019
- 403,130
- 156,868
- 146,689
- 121,873
- 115,302
Denver Area Codes Overview
- 303This page
- 720Same territory
- 983Same territory
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; each city's share inside 303 is measured from Census tract centroids.
What counties does area code 303 cover?
| 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:
- Census PEP Vintage 2024 (city populations)
- · 2020 Census tract centroids with NANP and TIGERweb boundaries (footprint, counties, city shares)
- · NANPA NPA and CO Code reports (dates, prefixes)
- · Methodology
Has area code 303 been reported for unwanted calls?
Yes – 4,168 FTC complaints, May 29 – Oct 1, 2026.
- 58% robocalls
- ↓ 11% vs prior period
- FTC data, retrieved 2026-10-05
Most-reported subjects
- Other55%2,305
- Medical & prescriptions12%494
- Dropped call or no message7%306
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.
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?
21% of its assigned prefixes are wireless. Largest holders: Qwest, Verizon Wireless, and Level 3 Communications.
Is 303 a scam area code?
Carriers hold 78% of its possible prefixes.
Why do I keep getting calls from the 303 area code?
Complaints fell 11% on the prior period.
Should I answer an unknown 303 number?
58% of its FTC complaints were robocalls. Its most-reported specific subject was "Medical & prescriptions", at 12%.
Where is area code 303?
303 covers 137 cities and 3,380,487 residents in 13 Colorado counties, led by Denver, Arapahoe, and Jefferson.
When did area code 303 go into service?
303 went into service in 1947. 720 and 983 now share its territory.
Is 303 a real area code?
Yes: 30 carriers hold its prefixes, serving 137 cities in Denver, Arapahoe, Jefferson, and 10 other counties.
What timezone is the 303 area code in?
303 is on Mountain Time (MT).
How do I call a 303 number from abroad?
Dial +1 303, then the number.