7 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kennebunk | York County | 12,013 |
| Kittery | York County | 11,876 |
| Kennebunkport | York County | 3,694 |
| Kenduskeag | Penobscot County | 1,427 |
| Kingfield | Franklin County | 1,029 |
| Knox | Waldo County | 822 |
| Kingsbury | Piscataquis County | 32 |