20 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 63090 | Washington | 23,258 |
| 63084 | Union | 20,708 |
| 63069 | Pacific | 15,697 |
| 63080 | Sullivan | 13,124 |
| 63077 | Saint Clair | 11,391 |
| 63068 | New Haven | 6,202 |
| 63089 | Villa Ridge | 5,662 |
| 63072 | Robertsville | 3,469 |
| 63037 | Gerald | 2,970 |
| 63060 | Lonedell | 2,192 |
| 63015 | Catawissa | 1,939 |
| 63056 | Leslie | 1,896 |
| 63055 | Labadie | 1,693 |
| 63013 | Beaufort | 1,136 |
| 63039 | Gray Summit | 986 |
| 63073 | Saint Albans | 803 |
| 63014 | Berger | 426 |
| 63041 | Grubville | 309 |
| 63061 | Luebbering | 216 |
| 63079 | Stanton | 60 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 20 ZCTAs in Franklin County, Missouri (US Census).