| Zip Code | City | Population ↓ |
|---|---|---|
| 70438 | Franklinton | 20,345 |
| 70427 | Bogalusa | 17,894 |
| 70426 | Angie | 5,912 |
| 70450 | Mount Hermon | 2,332 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 4 ZCTAs in Washington Parish, Louisiana (US Census).