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