18 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Gorham | Cumberland County | 18,458 |
| Gray | Cumberland County | 8,333 |
| Gardiner | Kennebec County | 6,271 |
| Glenburn | Penobscot County | 4,801 |
| Greene | Androscoggin County | 4,442 |
| Greenville | Piscataquis County | 1,790 |
| Gouldsboro | Hancock County | 1,742 |
| Greenbush | Penobscot County | 1,474 |
| Guilford | Piscataquis County | 1,304 |
| Georgetown | Sagadahoc County | 1,103 |
| Garland | Penobscot County | 1,028 |
| Greenwood | Oxford County | 774 |
| Grand Isle | Aroostook County | 364 |
| Gilead | Oxford County | 201 |
| Grand Lake Stream | Washington County | 130 |
| Garfield | Aroostook County | 80 |
| Great Pond | Hancock County | 62 |
| Glenwood | Aroostook County | 4 |