Zip Code | City | Population |
|---|---|---|
| 63090 | Washington | 22,105 |
| 63084 | Union | 20,071 |
| 63069 | Pacific | 14,961 |
| 63080 | Sullivan | 13,530 |
| 63077 | Saint Clair | 11,437 |
| 63068 | New Haven | 6,376 |
| 63089 | Villa Ridge | 5,855 |
| 63072 | Robertsville | 3,936 |
| 63037 | Gerald | 2,782 |
| 63060 | Lonedell | 2,240 |
| 63015 | Catawissa | 2,029 |
| 63055 | Labadie | 1,674 |
| 63056 | Leslie | 1,615 |
| 63073 | Saint Albans | 1,511 |
| 63013 | Beaufort | 1,191 |
| 63039 | Gray Summit | 644 |
| 63014 | Berger | 502 |
| 63041 | Grubville | 251 |
| 63079 | Stanton | 209 |
| 63061 | Luebbering | 64 |