7 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Kennebunk | York County | 12,204 |
| Kittery | York County | 11,586 |
| Kennebunkport | York County | 3,716 |
| Kenduskeag | Penobscot County | 1,420 |
| Kingfield | Franklin County | 1,043 |
| Knox | Waldo County | 807 |
| Kingsbury | Piscataquis County | 30 |