18 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Gorham | Cumberland County | 18,637 |
| Gray | Cumberland County | 8,867 |
| Gardiner | Kennebec County | 6,160 |
| Glenburn | Penobscot County | 4,805 |
| Greene | Androscoggin County | 4,590 |
| Greenville | Piscataquis County | 1,809 |
| Gouldsboro | Hancock County | 1,775 |
| Greenbush | Penobscot County | 1,580 |
| Guilford | Piscataquis County | 1,289 |
| Georgetown | Sagadahoc County | 1,090 |
| Garland | Penobscot County | 1,029 |
| Greenwood | Oxford County | 759 |
| Grand Isle | Aroostook County | 356 |
| Gilead | Oxford County | 199 |
| Grand Lake Stream | Washington County | 127 |
| Garfield | Aroostook County | 79 |
| Great Pond | Hancock County | 62 |
| Glenwood | Aroostook County | 4 |