6 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Jay town | Franklin County | 4,654 |
| Jefferson town | Lincoln County | 2,766 |
| Jonesport town | Washington County | 1,270 |
| Jackman town | Somerset County | 782 |
| Jonesboro town | Washington County | 642 |
| Jackson town | Waldo County | 630 |