20 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 63090 | Washington | 22,471 |
| 63084 | Union | 20,511 |
| 63069 | Pacific | 14,760 |
| 63080 | Sullivan | 13,529 |
| 63077 | Saint Clair | 11,466 |
| 63068 | New Haven | 6,581 |
| 63089 | Villa Ridge | 5,930 |
| 63072 | Robertsville | 3,692 |
| 63037 | Gerald | 2,826 |
| 63060 | Lonedell | 2,183 |
| 63015 | Catawissa | 1,959 |
| 63056 | Leslie | 1,723 |
| 63055 | Labadie | 1,628 |
| 63013 | Beaufort | 1,204 |
| 63073 | Saint Albans | 1,027 |
| 63039 | Gray Summit | 977 |
| 63014 | Berger | 404 |
| 63041 | Grubville | 306 |
| 63079 | Stanton | 182 |
| 63061 | Luebbering | 154 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Franklin County, Missouri (US Census).