| Zip Code | City | Population ↓ |
|---|---|---|
| 44483 | Warren | 25,899 |
| 44484 | Warren | 21,284 |
| 44446 | Niles | 20,260 |
| 44410 | Cortland | 16,549 |
| 44485 | Warren | 15,898 |
| 44420 | Girard | 15,100 |
| 44425 | Hubbard | 13,341 |
| 44481 | Warren | 9,769 |
| 44444 | Newton Falls | 9,577 |
| 44438 | Masury | 4,949 |
| 44440 | Mineral Ridge | 4,819 |
| 44430 | Leavittsburg | 4,372 |
| 44473 | Vienna | 4,145 |
| 44470 | Southington | 4,014 |
| 44437 | McDonald | 3,975 |
| 44403 | Brookfield | 3,798 |
| 44491 | West Farmington | 3,419 |
| 44428 | Kinsman | 3,337 |
| 44402 | Bristolville | 2,709 |
| 44450 | North Bloomfield | 2,223 |
| 44404 | Burghill | 1,490 |
| 44417 | Farmdale | 1,401 |
| 44418 | Fowler | 1,398 |
| 44439 | Mesopotamia | 431 |
| 44424 | Hartford | 83 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 25 ZCTAs in Trumbull County, Ohio (US Census).