| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Franklin County | 1 | 5.12% | 30,978 | 29,468 |
| Androscoggin County | 2 | 4.4% | 116,067 | 111,178 |
| Cumberland County | 3 | 4.2% | 316,360 | 303,606 |
| York County | 4 | 4.2% | 221,169 | 212,263 |
| Lincoln County | 5 | 3.59% | 36,522 | 35,256 |
| Oxford County | 6 | 3.58% | 59,963 | 57,892 |
| Piscataquis County | 7 | 3.43% | 17,378 | 16,801 |
| Kennebec County | 8 | 3.42% | 128,986 | 124,723 |
| Penobscot County | 9 | 3.4% | 157,351 | 152,179 |
| Hancock County | 10 | 2.84% | 57,091 | 55,512 |
| Waldo County | 11 | 2.72% | 40,744 | 39,666 |
| Sagadahoc County | 12 | 2.43% | 37,623 | 36,730 |
| Somerset County | 13 | 2.04% | 51,505 | 50,473 |
| Washington County | 14 | 0.68% | 31,320 | 31,108 |
| Knox County | 15 | 0.63% | 40,918 | 40,663 |
| Aroostook County | 16 | -0.97% | 66,403 | 67,053 |
Maine's counties show varied growth patterns from 2020 to 2025. Franklin County leads with 5.12% annualized growth, followed by Androscoggin County (4.4%) and Cumberland County (4.2%). The largest counties are Cumberland County (316,360), York County (221,169), and Penobscot County (157,351). Of the 16 counties in Maine, 15 are growing while just 1 has experienced population decline. Overall, counties averaged 2.86% annualized growth, with total population growing by 3.36% annually.
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