18 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Gorham | Cumberland County | 18,591 |
| Gray | Cumberland County | 8,725 |
| Gardiner | Kennebec County | 6,160 |
| Glenburn | Penobscot County | 4,795 |
| Greene | Androscoggin County | 4,541 |
| Gouldsboro | Hancock County | 1,764 |
| Greenville | Piscataquis County | 1,743 |
| Greenbush | Penobscot County | 1,547 |
| Guilford | Piscataquis County | 1,296 |
| Georgetown | Sagadahoc County | 1,091 |
| Garland | Penobscot County | 1,030 |
| Greenwood | Oxford County | 766 |
| Grand Isle | Aroostook County | 359 |
| Gilead | Oxford County | 199 |
| Grand Lake Stream | Washington County | 127 |
| Garfield | Aroostook County | 79 |
| Great Pond | Hancock County | 62 |
| Glenwood | Aroostook County | 4 |