41 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 04401 | Bangor | 44,854 |
| 04412 | Brewer | 9,652 |
| 04444 | Hampden | 9,371 |
| 04468 | Old Town | 9,291 |
| 04473 | Orono | 8,371 |
| 04457 | Lincoln | 5,823 |
| 04930 | Dexter | 4,258 |
| 04474 | Orrington | 3,853 |
| 04469 | Orono | 3,531 |
| 04428 | Eddington | 3,334 |
| 04953 | Newport | 3,143 |
| 04461 | Milford | 3,095 |
| 04456 | Levant | 3,069 |
| 04427 | Corinth | 2,990 |
| 04419 | Carmel | 2,941 |
| 04928 | Corinna | 2,192 |
| 04493 | West Enfield | 1,840 |
| 04418 | Greenbush | 1,649 |
| 04411 | Bradley | 1,645 |
| 04448 | Howland | 1,540 |
| 04430 | East Millinocket | 1,495 |
| 04765 | Patten | 1,434 |
| 04450 | Kenduskeag | 1,333 |
| 04969 | Plymouth | 1,319 |
| 04410 | Bradford | 1,254 |
| 04434 | Etna | 1,252 |
| 04449 | Hudson | 1,251 |
| 04932 | Dixmont | 1,207 |
| 04488 | Stetson | 1,151 |
| 04422 | Charleston | 1,117 |
| 04460 | Medway | 1,111 |
| 04435 | Exeter | 1,093 |
| 04455 | Lee | 925 |
| 04487 | Springfield | 838 |
| 04939 | Garland | 823 |
| 04453 | Lagrange | 785 |
| 04777 | Stacyville | 478 |
| 04475 | Passadumkeag | 384 |
| 04417 | Burlington | 355 |
| 04495 | Winn | 287 |
| 04489 | Stillwater | 214 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 41 ZCTAs in Penobscot County, Maine (US Census).