The 636 area code is located in the state of Missouri, and according to Intelius data, covers roughly 514,855 phone numbers and 780,115 listings across 438 prefixes.
This is a General Purpose Code, in service since May 22, 1999.
Area code 636 was split from area code 314.
Local calls within area code 636 require 7 digits dialing, while long-distance calls require 1 plus 10 digits dialing.
Have you received a call from a number with a 636 area code? Figure out who is calling you by performing a reverse phone lookup search. Intelius can provide you with a phone report that includes (when available) original line type and carrier, the number owner’s name, last known address and past addresses, age, possible relatives, and more.
| County Population (2025) | 108,090 |
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| County Population (2025) | 426,499 |
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| County Population (2025) | 990,911 |
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