Byrnes Mill - 636 dialing code
Dialing code +1 (636) cities
- Union
- Winfield
- Foley
- Hillsboro
- Troy
- St. Paul
- Augusta
- Parkdale
- St. Charles
- Washington
- Winchester
- Arnold
- Eureka
- Manchester
- Imperial
- Parkway
- Wildwood
- De Soto
- Warrenton
- Murphy
- Ellisville
- Chesterfield
- O'Fallon
- Pendleton
- Fenton
- Defiance
- Truesdale
- St. Clair
- Ballwin
- Barnhart
- Byrnes Mill
- Cave
- Cedar Hill
- Cedar Hill Lakes
- Chain of Rocks
- Clarkson Valley
- Cottleville
- Crystal City
- Dardenne Prairie
- Festus
- Flint Hill
- Foristell
- Fountain N' Lakes
- Gray Summit
- Hawk Point
- Herculaneum
- High Hill
- High Ridge
- Horine
- Innsbrook
- Jonesburg
- Josephville
- Kimmswick
- LaBarque Creek
- Lake St. Louis
- Lake Tekakwitha
- Marthasville
- Moscow Mills
- New Melle
- Old Monroe
- Olympian Village
- Pacific
- Peaceful Village
- Pevely
- Portage Des Sioux
- St. Peters
- Scotsdale
- Three Creeks
- Twin Oaks
- Valley Park
- Villa Ridge
- Weldon Spring
- Weldon Spring Heights
- Wentzville
- West Alton
- Wright City