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US area code · Missouri

Area code 636

Where the 636 area code is, its overlay and how to dial a +1 636 number from anywhere.

CoversBallwin, MissouriTime zoneCentral (CT)TypeGeographic
Quick answer

The 636 area code is in Ballwin, Missouri, United States (Central (CT)). To call from abroad: +1 636 555-0123.

StateMissouri
Main areaBallwin
Time zoneCentral (CT)
TypeGeographic
10-digit dialingNot required
In service since15-Apr-1999

The 636 area code is a geographic North American Numbering Plan (NANP) code covering Ballwin, Missouri. It has been in service since 15-Apr-1999 and sits in the Central (CT) time zone.

How to dial a 636 number

From abroad+1 636 555-0123
Within the US / Canada1 636 555-0123

Cities in the 636 area code

A 636 number is usually in one of these places in Missouri — 2 counties.

Ballwin Saint LouisChesterfield Saint LouisO'Fallon Saint CharlesSaint Charles Saint CharlesSaint Peters Saint CharlesWildwood

Other Missouri area codes

235314417557573660816975

Frequently asked questions

Where is the 636 area code?

The 636 area code is in Ballwin, Missouri, United States (Central (CT)).

Do I have to dial 10 digits for 636?

Local calls within 636 may use seven digits; ten-digit dialling always works.

How do I call a 636 number from another country?

Dial your exit code (or +), then 1, then 636, then the number: +1 636 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 636 number does not pinpoint a street or ZIP code.

Missed a call from +1 636?

In the 30 days to September 24, 2026, 371 unwanted calls showing a 636 number were reported to the US Federal Trade Commission, 50% of them recorded messages or robocalls. That puts 636 at #259 of 670 area codes reported.

Other210
Medical & prescriptions29
Calls pretending to be government, businesses, or family and friends27
Dropped call or no message23
Before you call back
  • If you do not know anyone in Missouri, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 636 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 636 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 636:

Southwestern Bell 110Brightspeed Of Missouri, LLC 49Onvoy, LLC 36T-Mobile USA, Inc. 35Level 3 Communications, LLC 29New Cingular Wireless PCS, LLC 29

About 18.4% of the 456 prefixes in use belong to mobile carriers: a 636 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

All US area codes United States +1 Map of area code 636 — cities & rate centres