St. Charles County, Missouri
14 ZIP codes · 560.5 sq mi of land · FIPS 29183
| Population | 414,535 |
|---|---|
| State | Missouri |
| FIPS code | 29183 |
| Time zone | Central |
| Land area | 560.5 sq mi |
| Center (lat, long) | 38.7811, -90.6749 |
Area codes in this area
These are the area codes that most often serve St. Charles County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Cities and towns (largest first)
Wentzville · 47,061Saint CharlesAugustaDefianceForistellNew MelleO FallonLake Saint LouisPortage Des SiouxSaint PetersWest Alton
ZIP codes in St. Charles County
63301 Saint Charles63303 Saint Charles63304 Saint Charles63332 Augusta63341 Defiance63348 Foristell63365 New Melle63366 O Fallon63367 Lake Saint Louis63368 O Fallon63373 Portage Des Sioux63376 Saint Peters63385 Wentzville63386 West Alton
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.