636 Area CodeO'Fallon, MO
Area code 636 covers O'Fallon and nearby communities in Missouri, in the Central Time (CT) zone, home to about 1,018,333 people across 78 cities. It's the only area code for this region, so the three digits alone place the caller.
Overview
- Major City
- O'Fallon
- State
- Missouri (MO)
- Timezone
- Central Time (CT)
- Current Time
- –:––
- Overlay
- No – unique area code
Where is area code 636?
Area code 636 serves part of O'Fallon, MO and the surrounding areas. It is a unique area code with no overlays.
Overview of the 636 Area Code
What is the 636 area code?
The 636 area code serves O'Fallon, Missouri. When you see a 636 number, it indicates a local number within this geographic area.
Why was area code 636 created?
Area code 636 went into service on May 22, 1999, taking over territory that had been part of area code 314.
Geographic Coverage of the 636 Area Code
The 636 area code serves O'Fallon and surrounding areas in Missouri. It operates within the Central Time (CT) time zone. This area code covers several key cities, including:
- O'Fallon
- St. Charles
- St. Peters
- Chesterfield
- Wentzville
- Wildwood
Got a call from a 636 number? It came from O'Fallon, MO. No other area code overlaps the 636 territory, so the prefix alone identifies where the caller is. Of the listed cities' population, O'Fallon accounts for about 13.5%; the rest is split across 77 smaller cities.
O'Fallon Area Code Overview
The 636 area code provides comprehensive telephone coverage for O'Fallon and its surrounding communities. As the sole area code for this region, it uniquely identifies all local numbers within the service area.
What cities does area code 636 cover?
| City | State | Population | Population in 636 | % of listed-city population | % of City |
|---|---|---|---|---|---|
| O'Fallon | MO | 95,355 | 95,355 | 13.5% | 100.0% |
| St. Charles | MO | 72,458 | 72,458 | 10.3% | 100.0% |
| St. Peters | MO | 61,398 | 61,398 | 8.7% | 100.0% |
| Chesterfield | MO | 49,465 | 39,359 | 7.0% | 79.6% |
| Wentzville | MO | 48,646 | 48,646 | 6.9% | 100.0% |
| Wildwood | MO | 35,082 | 35,082 | 5.0% | 100.0% |
| Ballwin | MO | 31,036 | 31,036 | 4.4% | 100.0% |
| Arnold | MO | 21,036 | 21,036 | 3.0% | 100.0% |
| Lake St. Louis | MO | 19,160 | 19,160 | 2.7% | 100.0% |
| Manchester | MO | 18,122 | 18,122 | 2.6% | 100.0% |
| Washington | MO | 15,521 | 15,521 | 2.2% | 100.0% |
| Troy | MO | 14,963 | 14,963 | 2.1% | 100.0% |
| Dardenne Prairie | MO | 14,407 | 14,407 | 2.0% | 100.0% |
| Festus | MO | 13,730 | 13,730 | 1.9% | 100.0% |
| Eureka | MO | 13,277 | 13,277 | 1.9% | 100.0% |
| Union | MO | 13,198 | 13,198 | 1.9% | 100.0% |
| Town and Country | MO | 11,625 | 0 | 1.7% | 0.0% |
| Ellisville | MO | 10,359 | 10,359 | 1.5% | 100.0% |
| Warrenton | MO | 9,420 | 9,420 | 1.3% | 100.0% |
| Sunset Hills | MO | 9,099 | 0 | 1.3% | 0.0% |
| Murphy | MO | 8,690 | 8,690 | 1.2% | 100.0% |
| Pacific | MO | 7,842 | 7,842 | 1.1% | 100.0% |
| Valley Park | MO | 6,747 | 6,747 | 1.0% | 100.0% |
| De Soto | MO | 6,503 | 6,503 | 0.9% | 100.0% |
| Cottleville | MO | 6,378 | 6,378 | 0.9% | 100.0% |
| Pevely | MO | 6,103 | 6,103 | 0.9% | 100.0% |
| Wright City | MO | 5,723 | 5,723 | 0.8% | 100.0% |
| Barnhart | MO | 5,682 | 5,682 | 0.8% | 100.0% |
| Herculaneum | MO | 5,321 | 5,321 | 0.8% | 100.0% |
| Weldon Spring | MO | 5,304 | 5,304 | 0.8% | 100.0% |
| St. Clair | MO | 4,748 | 4,748 | 0.7% | 100.0% |
| Imperial | MO | 4,709 | 4,709 | 0.7% | 100.0% |
| Crystal City | MO | 4,703 | 4,703 | 0.7% | 100.0% |
| High Ridge | MO | 4,305 | 4,305 | 0.6% | 100.0% |
| Moscow Mills | MO | 4,144 | 4,144 | 0.6% | 100.0% |
| Fenton | MO | 4,073 | 4,073 | 0.6% | 100.0% |
| St. Paul | MO | 3,725 | 3,725 | 0.5% | 100.0% |
| Hillsboro | MO | 3,489 | 3,489 | 0.5% | 100.0% |
| Byrnes Mill | MO | 3,189 | 3,189 | 0.5% | 100.0% |
| Gray Summit | MO | 2,701 | 2,701 | 0.4% | 100.0% |
| Villa Ridge | MO | 2,636 | 2,636 | 0.4% | 100.0% |
| Clarkson Valley | MO | 2,557 | 2,557 | 0.4% | 100.0% |
| Cedar Hill | MO | 1,721 | 1,721 | 0.2% | 100.0% |
| Winfield | MO | 1,637 | 1,637 | 0.2% | 100.0% |
| LaBarque Creek | MO | 1,558 | 1,558 | 0.2% | 100.0% |
| Winchester | MO | 1,407 | 1,407 | 0.2% | 100.0% |
| Marthasville | MO | 1,302 | 1,302 | 0.2% | 100.0% |
| Truesdale | MO | 929 | 929 | 0.1% | 100.0% |
| Horine | MO | 821 | 821 | 0.1% | 100.0% |
| Jonesburg | MO | 814 | 814 | 0.1% | 100.0% |
| Hawk Point | MO | 761 | 761 | 0.1% | 100.0% |
| Foristell | MO | 751 | 751 | 0.1% | 100.0% |
| Olympian Village | MO | 712 | 712 | 0.1% | 100.0% |
| Innsbrook | MO | 659 | 659 | 0.1% | 100.0% |
| Parkway | MO | 642 | 642 | 0.1% | 100.0% |
| Twin Oaks | MO | 588 | 588 | 0.1% | 100.0% |
| Flint Hill | MO | 561 | 561 | 0.1% | 100.0% |
| New Melle | MO | 547 | 547 | 0.1% | 100.0% |
| Josephville | MO | 517 | 517 | 0.1% | 100.0% |
| West Alton | MO | 353 | 353 | 0.1% | 100.0% |
| Portage Des Sioux | MO | 323 | 323 | 0.0% | 100.0% |
| Old Monroe | MO | 279 | 279 | 0.0% | 100.0% |
| Augusta | MO | 268 | 268 | 0.0% | 100.0% |
| Lake Tekakwitha | MO | 236 | 236 | 0.0% | 100.0% |
| Cedar Hill Lakes | MO | 201 | 201 | 0.0% | 100.0% |
| Scotsdale | MO | 196 | 196 | 0.0% | 100.0% |
| Fountain N' Lakes | MO | 188 | 188 | 0.0% | 100.0% |
| High Hill | MO | 185 | 185 | 0.0% | 100.0% |
| Defiance | MO | 155 | 155 | 0.0% | 100.0% |
| Parkdale | MO | 155 | 155 | 0.0% | 100.0% |
| Kimmswick | MO | 131 | 131 | 0.0% | 100.0% |
| Chain of Rocks | MO | 102 | 102 | 0.0% | 100.0% |
| Foley | MO | 97 | 97 | 0.0% | 100.0% |
| Peaceful Village | MO | 96 | 96 | 0.0% | 100.0% |
| Weldon Spring Heights | MO | 92 | 92 | 0.0% | 100.0% |
| Pendleton | MO | 36 | 36 | 0.0% | 100.0% |
| Three Creeks | MO | 8 | 8 | 0.0% | 100.0% |
| Cave | MO | 5 | 5 | 0.0% | 100.0% |
City population is shown in full. The share of each city inside 636 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 636 cover?
1,018,333 residents across 8 counties, counted inside the 636 boundary — a county split between codes contributes only its part.
| County | State | Population in 636 | % of area-code footprint | % of County |
|---|---|---|---|---|
| St. Charles County | MO | 405,262 | 40% | 100% |
| Jefferson County | MO | 226,739 | 22% | 100% |
| St. Louis County | MO | 211,485 | 21% | 21% |
| Franklin County | MO | 81,128 | 8% | 77% |
| Lincoln County | MO | 49,365 | 5% | 83% |
| Warren County | MO | 35,532 | 3% | 100% |
| Washington County | MO | 6,418 | 1% | 27% |
| Montgomery County | MO | 2,404 | 0% | 21% |
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 636 been reported for unwanted calls?
Yes – 1,022 unwanted-call complaints were reported to the FTC for numbers showing a 636 area code (May 29 – Aug 14, 2026).
- 52% robocalls
- ↓ 6% vs prior period
Most-reported subjects
- Other41%423
- Medical & prescriptions19%193
- Calls pretending to be government, businesses, or family and friends11%113
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 636?
41% assigned to a telco
- 82% Landline
- 18% Wireless
- 0% Unknown
of 409 | ||
| Prefix | Usage | Carrier |
|---|---|---|
| (636)200- | Landline | Onvoy |
| (636)201- | Wireless | New Cingular Wireless Pcs |
| (636)202- | Landline | Mcimetro Access Transmission Services |
| (636)203- | Landline | Mcimetro Access Transmission Services |
| (636)204- | Landline | Onvoy |
| (636)205- | Landline | Level 3 Communications |
| (636)206- | Landline | At&T |
| (636)207- | Landline | Southwestern Bell |
| (636)208- | Wireless | New Cingular Wireless Pcs |
| (636)209- | Wireless | Verizon Wireless |
| (636)210- | Wireless | New Cingular Wireless Pcs |
| (636)212- | Wireless | Verizon Wireless |
| (636)213- | Wireless | T-Mobile Usa |
| (636)214- | Wireless | T-Mobile Usa |
| (636)215- | Wireless | Verizon Wireless |
| (636)216- | Landline | Onvoy |
| (636)218- | Wireless | New Cingular Wireless Pcs |
| (636)219- | Wireless | T-Mobile Usa |
| (636)220- | Landline | Charter Fiberlink - Missouri |
| (636)221- | Landline | Southwestern Bell |
| (636)222- | Wireless | Verizon Wireless |
| (636)223- | Landline | At&T |
| (636)224- | Landline | Windstream Nuvox Missouri |
| (636)225- | Landline | Southwestern Bell |
| (636)226- | Landline | Southwestern Bell |
| (636)227- | Landline | Southwestern Bell |
| (636)228- | Landline | Centurylink |
| (636)229- | Landline | Mcimetro Access Transmission Services |
| (636)230- | Landline | Southwestern Bell |
| (636)231- | Landline | Windstream Nuvox Missouri |
| (636)232- | Landline | Level 3 Communications |
| (636)233- | Wireless | Verizon Wireless |
| (636)234- | Landline | Level 3 Communications |
| (636)235- | Landline | Level 3 Communications |
| (636)236- | Wireless | Sprint Spectrum |
| (636)237- | Landline | Mcimetro Access Transmission Services |
| (636)238- | Landline | Mcimetro Access Transmission Services |
| (636)239- | Landline | Southwestern Bell |
| (636)240- | Landline | Centurylink |
| (636)241- | Wireless | Verizon Wireless |
| (636)242- | Landline | Centurylink |
| (636)243- | Landline | Level 3 Communications |
| (636)244- | Landline | Charter Fiberlink - Missouri |
| (636)245- | Wireless | New Cingular Wireless Pcs |
| (636)246- | Landline | Onvoy |
| (636)247- | Landline | Southwestern Bell |
| (636)248- | Wireless | Verizon Wireless |
| (636)249- | Landline | Metropcs |
| (636)250- | Landline | Orchard Farm Tel. Co. |
| (636)251- | Wireless | Verizon Wireless |
| (636)252- | Wireless | T-Mobile Usa |
| (636)253- | Wireless | T-Mobile Usa |
| (636)255- | Landline | Southwestern Bell |
| (636)256- | Landline | Southwestern Bell |
| (636)257- | Landline | Southwestern Bell |
| (636)258- | Landline | Orchard Farm Tel. Co. |
| (636)259- | Wireless | T-Mobile Usa |
| (636)261- | Landline | Southwestern Bell |
| (636)262- | Wireless | Sprint Spectrum |
| (636)263- | Landline | At&T |
| (636)264- | Landline | Level 3 Communications |
| (636)265- | Landline | Charter Fiberlink - Missouri |
| (636)266- | Landline | Level 3 Communications |
| (636)270- | Landline | Radiantiq |
| (636)271- | Landline | Southwestern Bell |
| (636)272- | Landline | Centurylink |
| (636)273- | Landline | Southwestern Bell |
| (636)274- | Landline | Southwestern Bell |
| (636)275- | Wireless | Verizon Wireless |
| (636)277- | Landline | Peerless Network Of Missouri |
| (636)278- | Landline | Centurylink |
| (636)279- | Landline | Centurylink |
| (636)280- | Landline | Radiantiq |
| (636)281- | Landline | Centurylink |
| (636)282- | Landline | Southwestern Bell |
| (636)283- | Landline | Teleport Communications America |
| (636)284- | Wireless | New Cingular Wireless Pcs |
| (636)285- | Landline | Southwestern Bell |
| (636)287- | Landline | Southwestern Bell |
| (636)288- | Wireless | New Cingular Wireless Pcs |
| (636)289- | Landline | Bandwidth.Com Clec |
| (636)290- | Wireless | T-Mobile Usa |
| (636)292- | Landline | Teleport Communications America |
| (636)293- | Wireless | T-Mobile Usa |
| (636)294- | Landline | Charter Fiberlink - Missouri |
| (636)295- | Wireless | Verizon Wireless |
| (636)296- | Landline | Southwestern Bell |
| (636)297- | Wireless | Verizon Wireless |
| (636)299- | Landline | At&T |
| (636)300- | Landline | Southwestern Bell |
| (636)303- | Landline | Telnyx |
| (636)305- | Landline | Southwestern Bell |
| (636)306- | Landline | Metropcs |
| (636)310- | Landline | Charter Fiberlink - Missouri |
| (636)312- | Wireless | New Cingular Wireless Pcs |
| (636)317- | Landline | Charter Fiberlink - Missouri |
| (636)318- | Wireless | T-Mobile Usa |
| (636)319- | Landline | Centurylink |
| (636)320- | Wireless | Usa Mobility Wireless |
| (636)321- | Landline | Windstream Nuvox Missouri |
| (636)322- | Landline | Southwestern Bell |
| (636)323- | Landline | Level 3 Communications |
| (636)324- | Landline | Onvoy |
| (636)326- | Landline | Southwestern Bell |
| (636)327- | Landline | Centurylink |
| (636)328- | Landline | Mcimetro Access Transmission Services |
| (636)329- | Landline | Southwestern Bell |
| (636)330- | Landline | Peerless Network Of Missouri |
| (636)331- | Wireless | T-Mobile Usa |
| (636)332- | Landline | Centurylink |
| (636)333- | Landline | Onvoy |
| (636)334- | Landline | Level 3 Communications |
| (636)335- | Landline | Mcimetro Access Transmission Services |
| (636)336- | Landline | Mcleodusa Telecommunication Services |
| (636)337- | Landline | Southwestern Bell |
| (636)338- | Landline | Centurylink |
| (636)339- | Wireless | T-Mobile Usa |
| (636)341- | Wireless | T-Mobile Usa |
| (636)342- | Wireless | Dish Wireless |
| (636)343- | Landline | Southwestern Bell |
| (636)344- | Landline | Southwestern Bell |
| (636)345- | Landline | Mcimetro Access Transmission Services |
| (636)346- | Wireless | Sprint Spectrum |
| (636)347- | Landline | Hd Carrier |
| (636)348- | Landline | Fractel |
| (636)349- | Landline | Southwestern Bell |
| (636)351- | Wireless | Dish Wireless |
| (636)352- | Landline | Level 3 Communications |
| (636)354- | Wireless | New Cingular Wireless Pcs |
| (636)355- | Landline | Centurylink |
| (636)356- | Landline | Centurylink |
| (636)357- | Wireless | New Cingular Wireless Pcs |
| (636)358- | Wireless | New Cingular Wireless Pcs |
| (636)359- | Wireless | New Cingular Wireless Pcs |
| (636)362- | Landline | Southwestern Bell |
| (636)363- | Landline | American Messaging Services |
| (636)364- | Landline | Level 3 Communications |
| (636)366- | Landline | Centurylink |
| (636)367- | Landline | Metropcs |
| (636)368- | Wireless | Sprint Spectrum |
| (636)369- | Landline | Radiantiq |
| (636)373- | Wireless | Sprint Spectrum |
| (636)375- | Landline | Southwestern Bell |
| (636)376- | Landline | Southwestern Bell |
| (636)377- | Landline | Centurylink |
| (636)379- | Landline | Centurylink |
| (636)383- | Landline | Metropcs |
| (636)384- | Wireless | New Cingular Wireless Pcs |
| (636)385- | Landline | Centurylink |
| (636)386- | Landline | Southwestern Bell |
| (636)387- | Landline | Charter Fiberlink - Missouri |
| (636)388- | Landline | Level 3 Communications |
| (636)389- | Landline | Level 3 Communications |
| (636)390- | Landline | Southwestern Bell |
| (636)391- | Landline | Southwestern Bell |
| (636)392- | Landline | Aurora Communications |
| (636)393- | Landline | Charter Fiberlink - Missouri |
| (636)394- | Landline | Southwestern Bell |
| (636)395- | Landline | At&T |
| (636)397- | Landline | Centurylink |
| (636)398- | Landline | Centurylink |
| (636)399- | Wireless | Verizon Wireless |
| (636)400- | Landline | Fusion Cloud Services |
| (636)402- | Landline | Windstream Nuvox Missouri |
| (636)403- | Wireless | Usa Mobility Wireless |
| (636)405- | Landline | Southwestern Bell |
| (636)409- | Landline | Charter Fiberlink - Missouri |
| (636)410- | Landline | Xo Missouri |
| (636)412- | Landline | Xo Missouri |
| (636)422- | Landline | Southwestern Bell |
| (636)425- | Landline | Windstream Nuvox Missouri |
| (636)426- | Wireless | T-Mobile Usa |
| (636)428- | Landline | Teleport Communications America |
| (636)429- | Landline | Peerless Network Of Missouri |
| (636)431- | Landline | Mcimetro Access Transmission Services |
| (636)432- | Landline | Southwestern Bell |
| (636)433- | Landline | Centurylink |
| (636)434- | Landline | Southwestern Bell |
| (636)435- | Landline | Mcimetro Access Transmission Services |
| (636)438- | Landline | Xo Missouri |
| (636)439- | Wireless | New Cingular Wireless Pcs |
| (636)441- | Landline | Southwestern Bell |
| (636)442- | Landline | Southwestern Bell |
| (636)443- | Landline | Southwestern Bell |
| (636)444- | Landline | Onvoy |
| (636)445- | Landline | Centurylink Communications |
| (636)447- | Landline | Southwestern Bell |
| (636)448- | Wireless | New Cingular Wireless Pcs |
| (636)449- | Landline | Windstream Nuvox Missouri |
| (636)451- | Landline | Southwestern Bell |
| (636)452- | Landline | Southwestern Bell |
| (636)456- | Landline | Centurylink |
| (636)458- | Landline | Southwestern Bell |
| (636)459- | Wireless | Verizon Wireless |
| (636)461- | Landline | Southwestern Bell |
| (636)462- | Landline | Centurylink |
| (636)463- | Landline | Centurylink |
| (636)464- | Landline | Southwestern Bell |
| (636)465- | Landline | Charter Fiberlink - Missouri |
| (636)466- | Wireless | New Cingular Wireless Pcs |
| (636)467- | Landline | Southwestern Bell |
| (636)474- | Landline | Centurylink |
| (636)475- | Landline | Southwestern Bell |
| (636)477- | Landline | Southwestern Bell |
| (636)479- | Landline | Southwestern Bell |
| (636)481- | Landline | Level 3 Communications |
| (636)482- | Landline | Centurylink |
| (636)484- | Wireless | Verizon Wireless |
| (636)485- | Wireless | Verizon Wireless |
| (636)486- | Landline | Level 3 Communications |
| (636)487- | Landline | Level 3 Communications |
| (636)488- | Landline | Centurylink |
| (636)489- | Landline | Level 3 Communications |
| (636)492- | Landline | Mcimetro Access Transmission Services |
| (636)493- | Landline | Charter Fiberlink - Missouri |
| (636)495- | Landline | Windstream Nuvox Missouri |
| (636)496- | Landline | Southwestern Bell |
| (636)497- | Wireless | T-Mobile Usa |
| (636)498- | Landline | Southwestern Bell |
| (636)500- | Landline | Onvoy |
| (636)515- | Wireless | New Cingular Wireless Pcs |
| (636)517- | Landline | Southwestern Bell |
| (636)519- | Landline | Southwestern Bell |
| (636)524- | Landline | Level 3 Communications |
| (636)525- | Landline | Southwestern Bell |
| (636)527- | Landline | Southwestern Bell |
| (636)528- | Landline | Centurylink |
| (636)529- | Landline | Southwestern Bell |
| (636)530- | Landline | Southwestern Bell |
| (636)532- | Landline | Southwestern Bell |
| (636)533- | Landline | Xo Missouri |
| (636)534- | Landline | Mcimetro Access Transmission Services |
| (636)535- | Wireless | Verizon Wireless |
| (636)536- | Landline | Southwestern Bell |
| (636)537- | Landline | Southwestern Bell |
| (636)538- | Wireless | T-Mobile Usa |
| (636)541- | Wireless | New Cingular Wireless Pcs |
| (636)542- | Landline | Windstream Nuvox Missouri |
| (636)543- | Landline | Teleport Communications America |
| (636)544- | Wireless | New Cingular Wireless Pcs |
| (636)547- | Landline | Global Crossing Local Services |
| (636)548- | Landline | Global Crossing Local Services |
| (636)549- | Landline | Windstream Nuvox Missouri |
| (636)551- | Wireless | Verizon Wireless |
| (636)552- | Landline | Level 3 Communications |
| (636)556- | Landline | Global Crossing Local Services |
| (636)557- | Landline | Xo Missouri |
| (636)561- | Landline | Centurylink |
| (636)565- | Landline | Level 3 Communications |
| (636)566- | Landline | Centurylink |
| (636)573- | Landline | Xo Missouri |
| (636)574- | Landline | American Messaging Services |
| (636)575- | Wireless | New Cingular Wireless Pcs |
| (636)577- | Wireless | New Cingular Wireless Pcs |
| (636)578- | Wireless | Sprint Spectrum |
| (636)579- | Wireless | T-Mobile Usa |
| (636)582- | Landline | Aurora Communications |
| (636)583- | Landline | Southwestern Bell |
| (636)584- | Landline | Southwestern Bell |
| (636)585- | Landline | Centurylink |
| (636)586- | Landline | Southwestern Bell |
| (636)587- | Landline | Southwestern Bell |
| (636)589- | Landline | Onvoy |
| (636)590- | Landline | Global Crossing Local Services |
| (636)591- | Landline | Mcleodusa Telecommunication Services |
| (636)594- | Landline | Xo Missouri |
| (636)597- | Landline | Centurylink |
| (636)600- | Landline | Fusion Cloud Services |
| (636)614- | Landline | Level 3 Communications |
| (636)622- | Landline | Mcimetro Access Transmission Services |
| (636)625- | Landline | Centurylink |
| (636)626- | Landline | Onvoy |
| (636)627- | Landline | At&T |
| (636)628- | Landline | Global Crossing Local Services |
| (636)629- | Landline | Southwestern Bell |
| (636)630- | Landline | Commio |
| (636)633- | Wireless | T-Mobile Usa |
| (636)634- | Landline | Global Crossing Local Services |
| (636)635- | Landline | Onvoy Spectrum |
| (636)637- | Landline | Mcimetro Access Transmission Services |
| (636)638- | Landline | Charter Fiberlink - Missouri |
| (636)639- | Landline | Centurylink |
| (636)642- | Landline | Level 3 Communications |
| (636)648- | Landline | Global Crossing Local Services |
| (636)649- | Wireless | New Cingular Wireless Pcs |
| (636)651- | Landline | Teleport Communications America |
| (636)655- | Landline | Skyetel |
| (636)660- | Landline | Mcleodusa Telecommunication Services |
| (636)661- | Landline | Centurylink |
| (636)662- | Landline | Centurylink |
| (636)665- | Landline | Centurylink |
| (636)666- | Landline | Terra Nova Telecom |
| (636)667- | Wireless | Sprint Spectrum |
| (636)668- | Landline | Centurylink |
| (636)669- | Landline | Mcleodusa Telecommunication Services |
| (636)671- | Landline | Southwestern Bell |
| (636)673- | Landline | Centurylink |
| (636)674- | Landline | Windstream Nuvox Missouri |
| (636)675- | Wireless | T-Mobile Usa |
| (636)677- | Landline | Southwestern Bell |
| (636)678- | Landline | Global Crossing Local Services |
| (636)679- | Wireless | T-Mobile Usa |
| (636)680- | Landline | Windstream Nuvox Missouri |
| (636)681- | Landline | Teleport Communications America |
| (636)685- | Landline | Teleport Communications America |
| (636)686- | Landline | Teleport Communications America |
| (636)688- | Landline | Teleport Communications America |
| (636)689- | Landline | Teleport Communications America |
| (636)692- | Landline | Windstream Nuvox Missouri |
| (636)695- | Landline | Teleport Communications America |
| (636)696- | Landline | Teleport Communications America |
| (636)697- | Landline | Teleport Communications America |
| (636)698- | Landline | Teleport Communications America |
| (636)699- | Landline | Onvoy |
| (636)706- | Landline | Centurylink Communications |
| (636)707- | Landline | Level 3 Communications |
| (636)717- | Landline | Southwestern Bell |
| (636)720- | Landline | Windstream Nuvox Missouri |
| (636)722- | Landline | Southwestern Bell |
| (636)723- | Landline | Southwestern Bell |
| (636)724- | Landline | Southwestern Bell |
| (636)725- | Landline | Windstream Nuvox Missouri |
| (636)728- | Landline | Southwestern Bell |
| (636)730- | Landline | Southwestern Bell |
| (636)732- | Landline | Fractel |
| (636)733- | Landline | Southwestern Bell |
| (636)734- | Wireless | Sprint Spectrum |
| (636)735- | Landline | Southwestern Bell |
| (636)736- | Landline | Southwestern Bell |
| (636)737- | Landline | Southwestern Bell |
| (636)741- | Landline | Windstream Nuvox Missouri |
| (636)742- | Landline | Southwestern Bell |
| (636)744- | Landline | Southwestern Bell |
| (636)745- | Landline | Centurylink |
| (636)746- | Landline | Ton80 Communications |
| (636)747- | Landline | Onvoy |
| (636)748- | Landline | Bandwidth.Com Clec |
| (636)751- | Wireless | Verizon Wireless |
| (636)753- | Landline | Southwestern Bell |
| (636)754- | Landline | Xo Missouri |
| (636)755- | Landline | Centurylink |
| (636)757- | Landline | Windstream Nuvox Missouri |
| (636)758- | Landline | Fractel |
| (636)764- | Landline | Level 3 Communications |
| (636)773- | Landline | Onvoy |
| (636)775- | Landline | Charter Fiberlink - Missouri |
| (636)777- | Landline | Onvoy |
| (636)778- | Landline | Charter Fiberlink - Missouri |
| (636)779- | Landline | Windstream Nuvox Missouri |
| (636)782- | Landline | Centurylink |
| (636)787- | Landline | Xo Missouri |
| (636)789- | Landline | Southwestern Bell |
| (636)791- | Landline | Centurylink |
| (636)793- | Landline | Mcimetro Access Transmission Services |
| (636)794- | Landline | Xo Missouri |
| (636)795- | Wireless | New Cingular Wireless Pcs |
| (636)797- | Landline | Southwestern Bell |
| (636)798- | Landline | Centurylink |
| (636)800- | Landline | Onvoy |
| (636)812- | Landline | Mcleodusa Telecommunication Services |
| (636)821- | Landline | Windstream Nuvox Missouri |
| (636)825- | Landline | Southwestern Bell |
| (636)827- | Landline | Southwestern Bell |
| (636)828- | Landline | Centurylink |
| (636)829- | Wireless | T-Mobile Usa |
| (636)837- | Landline | Ton80 Communications |
| (636)841- | Wireless | T-Mobile Usa |
| (636)849- | Wireless | T-Mobile Usa |
| (636)851- | Landline | Southwestern Bell |
| (636)856- | Landline | Charter Fiberlink - Missouri |
| (636)861- | Landline | Southwestern Bell |
| (636)865- | Landline | Teleport Communications America |
| (636)866- | Landline | Mcimetro Access Transmission Services |
| (636)867- | Landline | Ton80 Communications |
| (636)874- | Landline | Ton80 Communications |
| (636)875- | Landline | Windstream Nuvox Missouri |
| (636)887- | Landline | Charter Fiberlink - Missouri |
| (636)888- | Landline | Peerless Network Of Missouri |
| (636)891- | Landline | Southwestern Bell |
| (636)893- | Landline | Mcimetro Access Transmission Services |
| (636)896- | Landline | Southwestern Bell |
| (636)898- | Landline | Xo Missouri |
| (636)899- | Landline | Southwestern Bell |
| (636)900- | Landline | Onvoy |
| (636)916- | Landline | Southwestern Bell |
| (636)922- | Landline | Southwestern Bell |
| (636)923- | Landline | Windstream Nuvox Missouri |
| (636)925- | Landline | Southwestern Bell |
| (636)926- | Landline | Southwestern Bell |
| (636)928- | Landline | Southwestern Bell |
| (636)931- | Landline | Southwestern Bell |
| (636)932- | Landline | Centurylink |
| (636)933- | Landline | Southwestern Bell |
| (636)936- | Landline | Southwestern Bell |
| (636)937- | Landline | Southwestern Bell |
| (636)938- | Landline | Southwestern Bell |
| (636)939- | Landline | Southwestern Bell |
| (636)940- | Landline | Southwestern Bell |
| (636)942- | Landline | Southwestern Bell |
| (636)944- | Landline | Southwestern Bell |
| (636)946- | Landline | Southwestern Bell |
| (636)947- | Landline | Southwestern Bell |
| (636)948- | Landline | Southwestern Bell |
| (636)949- | Landline | Southwestern Bell |
| (636)970- | Landline | Centurylink |
| (636)978- | Landline | Centurylink |
| (636)980- | Landline | Centurylink |
| (636)987- | Landline | Centurylink |
| (636)999- | Landline | Onvoy |
| No prefixes match “”. | ||
Frequently Asked Questions about the 636 Area Code
Who called me from a 636 number?
A 636 number is assigned to O'Fallon, Missouri, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 636 code to look nearby, so a 636 number doesn't prove the caller is local. Recently, 1,022 unwanted-call complaints were reported to the FTC for numbers showing the 636 code (52% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 636 a scam area code?
No area code is a scam on its own. 636 is a normal, officially assigned code for O'Fallon, Missouri. Spam callers spoof local codes to raise the odds you answer, so 636 on your caller ID says nothing about who is really calling. Recently, 1,022 unwanted-call complaints were reported to the FTC for numbers showing the 636 code (52% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 636 area code?
Repeated calls from different 636 numbers are usually spoofing: a robocaller rotates through 636 numbers so each call looks local and slips past simple blocks. Recently, 1,022 unwanted-call complaints were reported to the FTC for numbers showing the 636 code (52% 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 636 number?
If you aren't expecting a 636 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 636 area code?
Block a single 636 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 636 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 636?
Area code 636 covers O'Fallon and the surrounding area in Missouri, spanning 78 cities with about 1,018,333 residents. No other code overlays this region, so 636 alone identifies the area.
When did area code 636 go into service?
Area code 636 went into service on May 22, 1999. It was split off from area code 314.
Is 636 a real area code?
Yes. 636 is an active code in the North American Numbering Plan, assigned by NANPA and in service for O'Fallon, Missouri. A real code can still show up on spoofed spam calls, so treat unknown 636 calls with normal caution.
What timezone is the 636 area code in?
The 636 area code is in the Central Time (CT). Because a number can be kept when someone moves or switches to VoIP, a specific 636 caller may not be in that zone.
How do I call a 636 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 636 and the seven-digit number. From a mobile phone you can usually just enter +1 636 followed by the number and let the phone add the exit code for you.