Watch Area Code
Lookup Code
North American Area CodeCentral Time Zone

Area Code 636 Location & Details

State / Region: Missouri • Country: United States

Major Cities Covered: O'fallon, St. Charles, St. Peters, Florissant, Wentzville, Chesterfield, Wildwood, Ballwin, Hazelwood, Lake St. Louis

Standard Dial Format
+1 (636) XXX-XXXX
Country Code: +1 (NANP Format)
What State is Area Code 636?
MissouriState Hub →
Country Territory
United States
636 Area Code Time Zone
Central
636 Overlay Codes
No Overlays

Area Code 636 Geographic Map

Interactive location bounds and coverage area for Missouri (Central Timezone)

Lat: 38.63° • Lng: -90.71°
📍 Geographic Center: MissouriMap data © OpenStreetMap contributors

Where is Area Code 636 Located?

Telephone area code 636 is assigned to Missouri in United States. It serves cities and metropolitan communities including O'fallon, St. Charles, St. Peters, Florissant, Wentzville, Chesterfield, Wildwood, Ballwin, Hazelwood, Lake St. Louis.

Historical Context & Area Code Overlay Information:636 serves Missouri (United States).

For local and long-distance calls within area code 636, standard 10-digit dialing (636) XXX-XXXX applies.

Who Called Me from Area Code 636?

Received an unknown call, missed call, or text scam from area code 636? Here is how to trace who is calling from 636 area code and verify unknown numbers safely:

1.
Identify Missed Calls & Voicemails:

Legitimate contacts usually leave a detailed voicemail or caller ID record.

2.
Watch Out for Neighbor Spoofing:

Robocallers often fake incoming caller ID numbers using your local 636 prefix to boost pick-up rates.

3.
Reverse Phone Lookup Area Code 636:

Search public white-pages or use caller intelligence guides before returning unfamiliar calls.

Learn How Reverse Phone Lookups Work→

How to Call Area Code 636 & Dialing Format

When placing a phone call to a number in area code 636, follow the correct dialing format depending on your calling location:

  • Calling from inside the US / Canada (+1): Dial 1 + (636) + 7-digit number.
  • Calling from an international location outside +1: Dial your country's international exit code (e.g. 011 in US or + on mobile) + 1 + 636 + 7-digit number.
  • Do I need to dial area code 636 for local calls? Yes, 10-digit dialing (area code + line number) is mandatory across North American telephone networks.

Top Cities & Municipalities Served in Area Code 636

Urban centers, census places, and communities within the +1-636 calling area

50 Major Cities Listed
City NameCountyPopulation% of 636 Pop
O'fallonSt. Charles County96,10113.2%
St. CharlesSt. Charles County72,56110.0%
St. PetersSt. Charles County61,4798.5%
FlorissantSt. Louis city51,1247.0%
WentzvilleSt. Charles County49,4956.8%
ChesterfieldSt. Louis County49,3096.8%
WildwoodSt. Charles County34,9554.8%
BallwinSt. Louis County30,9014.3%
HazelwoodSt. Louis County24,8493.4%
Lake St. LouisSt. Charles County19,1292.6%
ManchesterSt. Louis County18,0692.5%
WashingtonFranklin County15,9062.2%
TroyLincoln County15,2012.1%
Dardenne PrairieSt. Charles County15,0322.1%
FestusJefferson County14,0661.9%
UnionFranklin County13,4451.9%
EurekaSt. Louis County13,4221.8%
BridgetonSt. Louis County11,2771.6%
EllisvilleSt. Louis County10,3151.4%
WarrentonWarren County9,6671.3%

Counties Covered by Area Code 636

Geographic county distribution and population coverage across Missouri

County NameTotal Population% of 636 Area% of County
St. Charles County422,59050.6%87%
St. Louis County991,66623.9%17%
St. Louis city280,4457.9%21%
Jefferson County232,1347.2%22%
Franklin County107,3874.8%32%
Lincoln County65,7782.8%31%
Warren County38,5272.8%53%

☎️Area Code 636 Exchange Prefixes & Carriers

Showing 50 of 454 central office 3-digit prefixes and assigned telecom carriers

72% Landline19% Wireless9% VoIP
PrefixLine UsageRate CenterAssigned CarrierAssign Date
(636) 200-💻VoIPMANCHESTERONVOY, LLC - MON/A
(636) 201-📱WirelessWARRENTONNEW CINGULAR WIRELESS PCS, LLC - IL08/17/2020
(636) 202-📞LandlineWARRENTONMCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO09/18/2018
(636) 203-📞LandlineFENTONMCIMETRO ACCESS TRANSMISSION SERVICES LLC - MON/A
(636) 204-💻VoIPWARRENTONONVOY, LLC - MO06/17/2021
(636) 205-📞LandlineWINFIELDLEVEL 3 COMMUNICATIONS, LLC - MO08/16/2002
(636) 206-📞LandlineST CHARLESAT&T ENTERPRISES, LLC03/28/2014
(636) 207-📞LandlineMANCHESTERSOUTHWESTERN BELLN/A
(636) 208-📱WirelessFSSCRSTLCYNEW CINGULAR WIRELESS PCS, LLC - IL10/23/2002
(636) 209-📱WirelessFSSCRSTLCYCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MON/A
(636) 210-📱WirelessUNIONNEW CINGULAR WIRELESS PCS, LLC - IL09/29/2020
(636) 211-📞LandlineXXXXXXXXXXMULTIPLE OCN LISTINGN/A
(636) 212-📱WirelessMAXVILLECELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO10/28/2002
(636) 213-📱WirelessWARRENTONT-MOBILE USA, INC.01/11/2022
(636) 214-📱WirelessCHESTERFLDT-MOBILE USA, INC.01/11/2022
(636) 215-📱WirelessMAXVILLECELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO01/07/2016
(636) 216-💻VoIPCHESTERFLDONVOY, LLC - MON/A
(636) 217-📞LandlineMOLocal Exchange CarrierN/A
(636) 218-📱WirelessMAXVILLENEW CINGULAR WIRELESS PCS, LLC - IL05/26/2021
(636) 219-📱WirelessST CHARLEST-MOBILE USA, INC.02/02/2001
(636) 220-📞LandlineMANCHESTERCHARTER IP ENABLED SERVICES, LLCN/A
(636) 221-📞LandlineWASHINGTONSOUTHWESTERN BELL05/14/2002
(636) 222-📱WirelessCEDAR HILLCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO10/28/2002
(636) 223-📞LandlineIMPERIALCHARTER IP ENABLED SERVICES, LLC01/29/2002
(636) 224-📞LandlineHERCUMPVLYPAETEC ITEL, LLCN/A
(636) 225-📞LandlineVALLEYPARKSOUTHWESTERN BELLN/A
(636) 226-📞LandlineVALLEYPARKSOUTHWESTERN BELLN/A
(636) 227-📞LandlineMANCHESTERSOUTHWESTERN BELLN/A
(636) 228-📞LandlineAUGUSTABRIGHTSPEED OF MISSOURI, LLCN/A
(636) 229-📞LandlineHARVESTERMCIMETRO ACCESS TRANSMISSION SERVICES LLC - MON/A
(636) 230-📞LandlineMANCHESTERSOUTHWESTERN BELLN/A
(636) 231-📞LandlineWASHINGTONPAETEC ITEL, LLCN/A
(636) 232-📞LandlineFSSCRSTLCYLEVEL 3 COMMUNICATIONS, LLC - MO04/09/2002
(636) 233-📱WirelessST CHARLESCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO11/06/2001
(636) 234-📞LandlineUNIONLEVEL 3 COMMUNICATIONS, LLC - MO04/09/2002
(636) 235-📞LandlineWARRENTONLEVEL 3 COMMUNICATIONS, LLC - MO04/09/2002
(636) 236-📱WirelessCHESTERFLDT-MOBILE USA, INC.05/10/2001
(636) 237-📞LandlineCHESTERFLDMCIMETRO ACCESS TRANSMISSION SERVICES LLC - MON/A
(636) 238-📞LandlineMANCHESTERMCIMETRO ACCESS TRANSMISSION SERVICES LLC - MON/A
(636) 239-📞LandlineWASHINGTONSOUTHWESTERN BELLN/A
(636) 240-📞LandlineOFALLONBRIGHTSPEED OF MISSOURI, LLCN/A
(636) 241-📱WirelessWASHINGTONCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO08/03/2022
(636) 242-📞LandlineMARTHASVLBRIGHTSPEED OF MISSOURI, LLC10/12/2006
(636) 243-📞LandlineDE SOTOLEVEL 3 COMMUNICATIONS, LLC - MO04/09/2002
(636) 244-📞LandlineHARVESTERCHARTER IP ENABLED SERVICES, LLC08/08/2001
(636) 245-📱WirelessMAXVILLENEW CINGULAR WIRELESS PCS, LLC - IL09/21/2020
(636) 246-💻VoIPST CHARLESONVOY, LLC - MON/A
(636) 247-📞LandlineCHESTERFLDSOUTHWESTERN BELL05/16/2002
(636) 248-📱WirelessST PETERSCELLCO PARTNERSHIP DBA VERIZON WIRELESS - MON/A
(636) 249-📱WirelessUNIONMETROPCS, INC.07/03/2014

Frequently Asked Questions about Area Code 636

Where is area code 636 located?

Area code 636 is located in Missouri (United States), serving cities like O'fallon, St. Charles, St. Peters, Florissant, Wentzville, Chesterfield, Wildwood, Ballwin, Hazelwood, Lake St. Louis.

What timezone is area code 636?

Area code 636 operates in the Central timezone.

What state is area code 636?

Area code 636 is assigned to the state / telecom territory of Missouri.

Is area code 636 a scam or dangerous?

Area code 636 is an official geographic area code for Missouri. However, beware of robocaller spoofing.

Missouri State Area Codes

View complete directory of telephone area codes assigned to Missouri.

Explore Missouri Directory

Get a 636 Business Phone Number

How to acquire a virtual phone number or business line with area code 636 for local customer trust in Missouri.

Get 636 Business Number
🛡️ Scam & Safety Directory

Check high-risk international callback scam area codes and robocall warning databases.

Scam Area Codes 2026

Overlay & Nearby Area Codes for Missouri

Explore neighboring telecom prefixes sharing geographical boundaries with area code 636.

235
Central
Area Code 235
Columbia, Jefferson City, Cape Girardeau, Rolla, Farmington, Hannibal, Poplar Bluff, Jackson, Sikeston, Fulton
314
Central
Area Code 314
St. Louis, Florissant, University City, Kirkwood, Maryland Heights, Webster Groves, Arnold, Creve Coeur, Ferguson, Clayton
417
Central
Area Code 417
Springfield, Joplin, Nixa, Ozark, Republic, Carthage, Lebanon, Neosho, Webb City, Branson
557
Central
Area Code 557
St. Louis, University City, Kirkwood, Maryland Heights, Webster Groves, Arnold, Creve Coeur, Ferguson, Clayton, Overland
573
Central
Area Code 573
Columbia, Jefferson City, Cape Girardeau, Rolla, Farmington, Hannibal, Poplar Bluff, Jackson, Sikeston, Fulton
660
Central
Area Code 660
Sedalia, Warrensburg, Kirksville, Washington, Marshall, Moberly, Maryville, Clinton, Chillicothe, Boonville