Founded in 1816, Penobscot County is one of 16 counties in the state of Maine. Historically, Penobscot County, formerly known as Penobscot County, Massachusetts was formed from part of Hancock County. The city of Bangor is the county seat. With FIPS code of 19, Penobscot County has a population of 152,765 and area of 3,556 square miles (9,210 km2).
List of all cities in Penobscot County, ME alphabetically
| City/Town | Postal Code | Area Code |
| Alton, ME | 04468 | 207 |
| Argyle Township, ME | 04468 | 207 |
| Bangor, ME | 04401 | 207 |
| 04402 | 207 | |
| Bradford, ME | 04410 | 207 |
| Bradley, ME | 04411 | 207 |
| Brewer, ME | 04412 | 207 |
| Burlington, ME | 04417 | 207 |
| Cardville, ME | 04418 | 207 |
| Carmel, ME | 04419 | 207 |
| Carroll Plt, ME | 04487 | 207 |
| Charleston, ME | 04422 | 207 |
| Chester, ME | 04457 | 207 |
| Clifton, ME | 04428 | 207 |
| Corinna, ME | 04928 | 207 |
| Corinth, ME | 04427 | 207 |
| Costigan, ME | 04418 | 207 |
| Dedham, ME | 04429 | 207 |
| Dexter, ME | 04930 | 207 |
| Dixmont, ME | 04932 | 207 |
| East Corinth, ME | 04427 | 207 |
| East Holden, ME | 04429 | 207 |
| East Millinocket, ME | 04430 | 207 |
| East Newport, ME | 04933 | 207 |
| Eddington, ME | 04428 | 207 |
| Enfield, ME | 04493 | 207 |
| Etna, ME | 04434 | 207 |
| Exeter, ME | 04435 | 207 |
| Garland, ME | 04939 | 207 |
| Glenburn, ME | 04401 | 207 |
| Greenbush, ME | 04418 | 207 |
| Greenfield Township, ME | 04418 | 207 |
| Greenfld Township, ME | 04418 | 207 |
| Hampden, ME | 04444 | 207 |
| Hermon, ME | 04401 | 207 |
| Herseytown Township, ME | 04777 | 207 |
| Holden, ME | 04429 | 207 |
| Howland, ME | 04448 | 207 |
| Hrsytown Township, ME | 04777 | 207 |
| Hudson, ME | 04449 | 207 |
| Indian Island, ME | 04468 | 207 |
| Kenduskeag, ME | 04450 | 207 |
| Kingman, ME | 04451 | 207 |
| Kingman Township, ME | 04451 | 207 |
| Lagrange, ME | 04453 | 207 |
| Lakeville, ME | 04487 | 207 |
| Lee, ME | 04455 | 207 |
| Levant, ME | 04456 | 207 |
| Lincoln, ME | 04457 | 207 |
| Lincoln Center, ME | 04457 | 207 |
| Lowell, ME | 04493 | 207 |
| Macwahoc Plt, ME | 04451 | 207 |
| Mattamisc Township, ME | 04457 | 207 |
| Mattamiscontis Township, ME | 04457 | 207 |
| Mattawamkeag, ME | 04459 | 207 |
| Maxfield, ME | 04453 | 207 |
| Medway, ME | 04460 | 207 |
| Milford, ME | 04461 | 207 |
| Millinocket, ME | 04462 | 207 |
| Molunkus Township, ME | 04459 | 207 |
| Mount Chase, ME | 04765 | 207 |
| Newburgh, ME | 04444 | 207 |
| Newport, ME | 04953 | 207 |
| Olamon, ME | 04418 | 207 |
| Old Town, ME | 04468 | 207 |
| Orono, ME | 04469 | 207 |
| 04473 | 207 | |
| Orrington, ME | 04474 | 207 |
| Passadumkeag, ME | 04475 | 207 |
| Patten, ME | 04765 | 207 |
| Plymouth, ME | 04969 | 207 |
| Prentiss Township, ME | 04487 | 207 |
| Ripley, ME | 04930 | 207 |
| Seboeis Plt, ME | 04448 | 207 |
| Sherman Station, ME | 04777 | 207 |
| Springfield, ME | 04487 | 207 |
| Stacyville, ME | 04777 | 207 |
| Stetson, ME | 04488 | 207 |
| Stillwater, ME | 04489 | 207 |
| University of Maine, ME | 04469 | 207 |
| Veazie, ME | 04401 | 207 |
| Webster Plt, ME | 04487 | 207 |
| West Enfield, ME | 04493 | 207 |
| Winn, ME | 04495 | 207 |
| Woodville, ME | 04457 | 207 |