| City | County | 2026 Pop. ↓ |
|---|---|---|
| Auburn | Androscoggin County | 25,651 |
| Augusta | Kennebec County | 19,130 |
| Arundel | York County | 4,657 |
| Alfred | York County | 3,190 |
| Acton | York County | 2,738 |
| Anson | Somerset County | 2,335 |
| Albion | Kennebec County | 2,092 |
| Appleton | Knox County | 1,483 |
| Addison | Washington County | 1,207 |
| Ashland | Aroostook County | 1,176 |
| Athens | Somerset County | 946 |
| Andover | Oxford County | 882 |
| Alton | Penobscot County | 841 |
| Alna | Lincoln County | 730 |
| Abbot | Piscataquis County | 632 |
| Alexander | Washington County | 515 |
| Arrowsic | Sagadahoc County | 501 |
| Avon | Franklin County | 448 |
| Amherst | Hancock County | 269 |
| Amity | Aroostook County | 249 |
| Allagash | Aroostook County | 234 |
| Aurora | Hancock County | 93 |