16 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 70433 | Covington | 40,598 |
| 70458 | Slidell | 39,555 |
| 70461 | Slidell | 32,229 |
| 70448 | Mandeville | 26,364 |
| 70471 | Mandeville | 23,425 |
| 70460 | Slidell | 21,843 |
| 70435 | Covington | 20,098 |
| 70447 | Madisonville | 17,400 |
| 70452 | Pearl River | 13,281 |
| 70445 | Lacombe | 9,391 |
| 70420 | Abita Springs | 8,391 |
| 70437 | Folsom | 7,402 |
| 70431 | Bush | 5,378 |
| 70464 | Talisheek | 184 |
| 70457 | Saint Benedict | 169 |
| 70463 | Sun | 104 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in St. Tammany Parish, Louisiana (US Census).