Area Code 636 — Missouri

Active General Purpose Code United States

Area code 636 is located in Missouri and operates on Central Time . The largest city served is O'Fallon .

Coverage Area

Area code 636 — Missouri

Area Code Details

Area Code: 636
State / Province: Missouri (MO)
Country: United States
Time Zone: Central Time Central Time
Local Time Now: —
Status: Active
Code Type: General Purpose Code
In Service Since: May 22, 1999
Assigned: April 15, 1999
Population Served: ~148,224 est.

Cities Served

Largest City O'Fallon

O'Fallon Manchester Washington Troy Eureka Imperial Fenton O'Fallon MCA4 St Charles Harvester MCA4 Harvester Portage des Sioux St Charles MCA3

History & Relationships

Split from

Rate Centers & Exchanges

13 rate centers identified within area code 636

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Other Area Codes in Missouri

Nearby Area Codes

Frequently Asked Questions About Area Code 636

What state is area code 636?

Area code 636 is located in Missouri, United States.

Where is area code 636 from?

Area code 636 originates from Missouri. It operates in the Central Time zone.

What time zone is area code 636?

Area code 636 falls within the Central Time zone (Central Time).

What cities are in area code 636?

Area code 636 serves cities including O'Fallon, Manchester, Washington, Troy, Eureka, Imperial, Fenton, O'Fallon MCA4, and more.

Is a call from area code 636 a scam?

Area code 636 is a legitimate general purpose code area code serving Missouri. Like any area code, individual numbers using 636 can be used for scam calls — always verify the specific number if you receive an unexpected or suspicious call.