Where is the 636 area code?

Area code 636 covers Missouri, on Central Time.

What time zone is area code 636 in?

Numbers in the 636 area code sit in Central Time.

Is 636 a toll-free or scam area code?

No. 636 is a geographic North American Numbering Plan area code assigned to Missouri. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 636 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

636 area code

Where the 636 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: MO
Codes in state: 9
Overlays & neighbours: 8
Time zone: Central Time

Quick answer

Area code 636 is a geographic area code assigned to Missouri under the North American Numbering Plan. Missouri observes Central Time, and the state also holds 8 other area codes: 235, 314, 417, 557, 573, 660, 816, 975.

Largest cities in Missouri

The largest places in Missouri. Each links to its full local profile: population, income, housing and sales tax.

City	Population
Kansas City city	508,233
St. Louis city	293,109
Springfield city	169,432
Columbia city	127,200
Independence city	121,944
Lee's Summit city	102,583
O'Fallon city	92,697
St. Joseph city	71,542
St. Charles city	71,048
Blue Springs city	59,416
St. Peters city	58,200
Joplin city	52,218

All Missouri cities All Missouri ZIP codes Missouri sales tax

Related area codes

Codes that share or border the same calling area.

636 area code FAQ

The questions people ask about this code.

Where is area code 636?

636 is a geographic area code in Missouri.

What time is it in the 636 area code?

636 observes Central Time.

Is 636 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.