There are 18 cities in Knox County, Maine.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rockland | 1 | 7,059 | 6,948 | 0.4% | 549 | 12.8 | City |
| Camden | 2 | 5,167 | 5,233 | -1.09% | 283 | 18.2 | Town |
| Warren | 3 | 4,946 | 4,880 | 0.08% | 106 | 46.5 | Town |
| Rockport | 4 | 3,646 | 3,651 | -0.87% | 168 | 21.6 | Town |
| Thomaston | 5 | 2,732 | 2,740 | -0.87% | 250 | 10.9 | Town |
| St. George | 6 | 2,590 | 2,597 | -0.77% | 103 | 25.0 | Town |
| Union | 7 | 2,446 | 2,383 | 0.29% | 76 | 32.2 | Town |
| Hope | 8 | 1,721 | 1,699 | -0.64% | 78 | 22.0 | Town |
| Washington | 9 | 1,566 | 1,595 | -1.26% | 41 | 38.0 | Town |
| South Thomaston | 10 | 1,515 | 1,513 | -1.11% | 133 | 11.4 | Town |
| Owls Head | 11 | 1,493 | 1,501 | -1% | 168 | 8.9 | Town |
| Cushing | 12 | 1,478 | 1,501 | -1.14% | 77 | 19.2 | Town |
| Appleton | 13 | 1,449 | 1,412 | 0.14% | 44 | 32.7 | Town |
| Vinalhaven | 14 | 1,253 | 1,287 | -1.42% | 53 | 23.5 | Town |
| Friendship | 15 | 1,141 | 1,145 | -0.87% | 81 | 14.1 | Town |
| North Haven | 16 | 424 | 419 | -0.24% | 36 | 11.6 | Town |
| Isle au Haut | 17 | 88 | 88 | 0% | 7 | 12.5 | Town |
| Matinicus Isle plantation | 18 | 50 | 51 | -1.96% | 21 | 2.4 | Plantation |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Rockland is the largest city in Knox County.
Matinicus Isle plantation is the smallest city in Knox County.
There are 18 cities in Knox County, Maine.