16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 70433 | Covington | 41,876 |
| 70458 | Slidell | 39,034 |
| 70461 | Slidell | 34,808 |
| 70448 | Mandeville | 26,338 |
| 70471 | Mandeville | 24,199 |
| 70435 | Covington | 22,475 |
| 70460 | Slidell | 21,669 |
| 70447 | Madisonville | 17,897 |
| 70452 | Pearl River | 12,650 |
| 70445 | Lacombe | 9,288 |
| 70437 | Folsom | 8,030 |
| 70420 | Abita Springs | 7,950 |
| 70431 | Bush | 5,769 |
| 70457 | Saint Benedict | 143 |
| 70464 | Talisheek | 109 |
| 70463 | Sun | 99 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in St. Tammany Parish, Louisiana (US Census).