41 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 04401 | Bangor | 44,418 |
| 04412 | Brewer | 9,654 |
| 04444 | Hampden | 9,322 |
| 04468 | Old Town | 9,163 |
| 04473 | Orono | 8,383 |
| 04457 | Lincoln | 5,755 |
| 04930 | Dexter | 4,216 |
| 04474 | Orrington | 3,837 |
| 04428 | Eddington | 3,374 |
| 04469 | Orono | 3,310 |
| 04953 | Newport | 3,145 |
| 04461 | Milford | 3,083 |
| 04456 | Levant | 3,012 |
| 04427 | Corinth | 2,942 |
| 04419 | Carmel | 2,901 |
| 04928 | Corinna | 2,079 |
| 04493 | West Enfield | 1,790 |
| 04418 | Greenbush | 1,702 |
| 04411 | Bradley | 1,561 |
| 04430 | East Millinocket | 1,545 |
| 04448 | Howland | 1,489 |
| 04765 | Patten | 1,452 |
| 04969 | Plymouth | 1,319 |
| 04450 | Kenduskeag | 1,306 |
| 04434 | Etna | 1,245 |
| 04932 | Dixmont | 1,241 |
| 04422 | Charleston | 1,189 |
| 04410 | Bradford | 1,180 |
| 04460 | Medway | 1,144 |
| 04449 | Hudson | 1,144 |
| 04435 | Exeter | 1,132 |
| 04488 | Stetson | 1,087 |
| 04455 | Lee | 934 |
| 04453 | Lagrange | 839 |
| 04939 | Garland | 819 |
| 04487 | Springfield | 742 |
| 04777 | Stacyville | 503 |
| 04417 | Burlington | 386 |
| 04475 | Passadumkeag | 380 |
| 04489 | Stillwater | 366 |
| 04495 | Winn | 273 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 41 ZCTAs in Penobscot County, Maine (US Census).