100 Largest ZIP Codes in the United States by Population in St. Charles County, Missouri
Explore the 100 largest ZIP codes in the United States ranked by population using U.S. Census demographic data. This page lists ZIP codes located in St. Charles County, Missouri.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 63376 | SAINT PETERS | MO | 74,967 |
| 2 | 63366 | O FALLON | MO | 52,746 |
| 3 | 63301 | SAINT CHARLES | MO | 51,401 |
| 4 | 63385 | WENTZVILLE | MO | 48,535 |
| 5 | 63303 | SAINT CHARLES | MO | 47,285 |
| 6 | 63368 | O FALLON | MO | 46,124 |
| 7 | 63304 | SAINT CHARLES | MO | 42,738 |
| 8 | 63367 | LAKE SAINT LOUIS | MO | 27,371 |
| 9 | 63348 | FORISTELL | MO | 10,555 |
| 10 | 63341 | DEFIANCE | MO | 3,628 |
| 11 | 63332 | AUGUSTA | MO | 1,742 |
| 12 | 63373 | PORTAGE DES SIOUX | MO | 687 |
| 13 | 63386 | WEST ALTON | MO | 522 |
| 14 | 63365 | NEW MELLE | MO | 66 |