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636 Area Code

Area code 636 serves O'Fallon, St. Charles, St. Peters, Florissant, Wentzville and nearby communities in Missouri. It has been in service since May 22, 1999, when it was split from 314.

StateMissouri
Time zoneCentral
Local time now…
Prefixes in use435
Projected to run out2075
O'FallonSt. CharlesSt. PetersFlorissantWentzvilleChesterfieldWildwoodBallwinHazelwoodOld JamestownWarrensburgLake St. LouisManchesterWashingtonTroyDardenne PrairieFestusUnionEurekaBridgetonEllisvilleWarrentonMurphyPacificValley ParkCottlevilleBlack JackDe SotoPevelyBarnhartWright CityImperialHerculaneumWeldon SpringO'FallonChesterfield
Cities and towns served by area code 636

Who issues 636 numbers

Mobile 19%VoIP and cable 31%Landline 49%

Share of the 435 prefixes (the three digits after 636) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T (Southwestern Bell)110
Brightspeed Of Missouri49
Onvoy (Sinch)37
T-Mobile35
AT&T Mobility29
Lumen (Level 3)29
Verizon Business (MCImetro)28
Paetec Itel25

Cities and towns in area code 636

CityPopulationOther area codes
O'Fallon96,101
St. Charles72,561
St. Peters61,479
Florissant51,124
Wentzville49,495
Chesterfield49,309
Wildwood34,955
Ballwin30,901
Hazelwood24,849
Old Jamestown21,121
Warrensburg20,283660
Lake St. Louis19,129
Manchester18,069
Washington15,906
Troy15,201
Dardenne Prairie15,032
Festus14,066
Union13,445
Eureka13,422
Bridgeton11,277
Ellisville10,315
Warrenton9,667
Murphy8,566
Pacific7,824
Valley Park6,767
Cottleville6,717
Black Jack6,547
De Soto6,527
Pevely6,239
Barnhart6,036
Wright City5,854
Imperial5,617
Herculaneum5,402
Weldon Spring5,301

Got a call from 636?

A 636 number was originally issued in Missouri, but that does not prove the caller is there. 31% of 636 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 435 prefixes in area code 636

Format: (636) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 636

Where is area code 636?
Area code 636 is in Missouri. It covers O'Fallon, St. Charles, St. Peters, Florissant, Wentzville, Chesterfield and 28 more cities and towns.
What time zone is area code 636?
Area code 636 is in the Central time zone.
Is 636 a toll-free number?
No. 636 is a geographic area code in Missouri. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Will area code 636 run out of numbers?
NANPA's latest forecast projects area code 636 to exhaust in the third quarter of 2075. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Missouri