County · Missouri · United States
St. Charles County ZIP codes
14 ZIP codes · 11 cities · FIPS 29183
Key facts
- State
- Missouri (MO)
- FIPS code
- 29183
- Population
- 409,830
- Median household income
- $102,912
- Median age
- 39.6
- Land area
- 560.5 sq mi (1,451.7 km²)
- Population density
- 731 / sq mi
- Area codes
- 636, 816
Cities and ZIP codes in St. Charles County (11)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.