7 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kennebunk | York County | 12,116 |
| Kittery | York County | 11,325 |
| Kennebunkport | York County | 3,712 |
| Kenduskeag | Penobscot County | 1,415 |
| Kingfield | Franklin County | 1,029 |
| Knox | Waldo County | 809 |
| Kingsbury | Piscataquis County | 30 |