County ProfileMO
St. Charles County
Population: 405,262 · 16 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
405,262
People
Median age
39.8
Housing
Total households
161,311
Income
Median household income
$104,692
Housing
Total housing units
167,163
Employment
Employment rate
67.3%
Education
Bachelor’s degree or higher
42.7%
Healthcare
Insured population
95.8%
County details
Local time 04:23:12(CT)| Name | St. Charles |
|---|---|
| Total ZIP codes | 16total |
| ZIP codes (by type) | 13 Standard3 PO Box |
| Area code | 636 |
| Timezone | Central Time (CT) |
| Coordinates | 38.7811023, -90.6749153 |
| Land area | 560.3 sq miles(1,451.2 km²) |
Map of St. Charles county, Missouri with ZIP codes
Cities and Communities in St. Charles County
Compare the largest cities in St. Charles County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| O Fallon | 91,316 | $110,443 | 2ZIPs |
| Saint Charles | 70,493 | $85,937 | 4ZIPs |
| Saint Peters | 57,732 | $91,637 | 1ZIPs |
| Wentzville | 44,372 | $112,394 | 1ZIPs |
| Lake Saint Louis | 16,707 | $125,693 | 1ZIPs |
| Cottleville | 5,611 | $131,310 | 1ZIPs |
| Foristell | 550 | $116,581 | 1ZIPs |
| New Melle | 541 | $114,375 | 1ZIPs |
| West Alton | 359 | $111,500 | 1ZIPs |
| Portage Des Sioux | 335 | $62,188 | 1ZIPs |
| Augusta | 270 | $103,750 | 1ZIPs |
| Defiance | 159 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in St. Charles County
Review the most populated postal areas across St. Charles County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 63376 | Saint Peters | $96,393 | 76,064 |
| 63366 | O Fallon | $100,621 | 53,861 |
| 63301 | Saint Charles | $85,308 | 50,890 |
| 63385 | Wentzville | $112,199 | 47,756 |
| 63303 | Saint Charles | $99,138 | 47,292 |
| 63368 | O Fallon | $124,297 | 46,007 |
| 63304 | Saint Charles | $114,442 | 42,028 |
| 63367 | Lake Saint Louis | $137,648 | 27,009 |
| 63348 | Foristell | $115,661 | 10,051 |
| 63341 | Defiance | $170,598 | 3,784 |
| 63332 | Augusta | $146,146 | 1,406 |
| 63373 | Portage Des Sioux | $88,750 | 617 |
| 63386 | West Alton | $110,250 | 397 |
| 63365 | New Melle | $53,542 | 63 |
| 63302 | Saint Charles | — | — |
| 63338 | Cottleville | — | — |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS