What area code is 636?
Here's everything about it.
Instant lookup for the 636 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
636 at a glance
Summary
Cities & regions served by 636
St. CharlesShowing 12 of 15 recorded communities — major cities first.
Where 636 sits on the map
No overlayCoverage area
About the 636 region
636 covers St. Charles in Missouri, including Arnold, Ballwin, Chesterfield, Eureka and Lake St. Louis. The code has been in service since 1999.
636 currently has no overlay, so its territory keeps a single, unshared code.
Split of 314.
Who called me from 636?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 636 does not prove the caller is really in the 636 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 636 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 636 number below.
Frequently asked questions
FAQWhat area code is 636?+–
636 is a telephone area code serving St. Charles in Missouri, United States, in service since 1999.
Where is area code 636 located?+–
It covers Arnold, Ballwin, Chesterfield, Eureka and Lake St. Louis in Missouri.
What cities are in area code 636?+–
Major communities on record include Arnold, Ballwin, Chesterfield, Eureka and Lake St. Louis, among others. The code's territory spans the St. Charles region of Missouri.
What time zone is 636?+–
636 observes Central (CT), which is UTC−6 / −5 DST and follows daylight saving time.
When did area code 636 start?+–
636 entered service in 1999. Its history: split of 314.
Is 636 a scam area code?+–
Scam and robocall traffic can use any North American code, 636 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 636 number, and report anything suspicious.
Can I get a 636 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 636 number regardless of where you physically live.