St. Charles County, Missouri ZIP Codes
- ZIP records
14 - Cities represented
11 - Sum of listed ZIP population estimates
416,486
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 63376 | Saint Peters | 74,962 |
| 2 | 63366 | O'Fallon | 54,769 |
| 3 | 63301 | Saint Charles | 52,667 |
| 4 | 63385 | Wentzville | 51,330 |
| 5 | 63368 | O'Fallon | 46,966 |
| 6 | 63303 | Saint Charles | 46,089 |
| 7 | 63304 | Saint Charles | 43,195 |
| 8 | 63367 | Lake Saint Louis | 29,725 |
| 9 | 63348 | Foristell | 10,394 |
| 10 | 63341 | Defiance | 3,515 |
Cities in St. Charles County
- Augusta
- Defiance
- Foristell
- Lake Saint Louis
- New Melle
- O'Fallon
- Portage Des Sioux
- Saint Charles
- Saint Peters
- Wentzville
- West Alton
ZIP Directory
- ZIP 63301
- ZIP 63303
- ZIP 63304
- ZIP 63332
- ZIP 63341
- ZIP 63348
- ZIP 63365
- ZIP 63366
- ZIP 63367
- ZIP 63368
- ZIP 63373
- ZIP 63376
- ZIP 63385
- ZIP 63386
Browse all ZIP data for Missouri
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.