| Rank | County | Population (2012) |
|---|---|---|
| 1 | Cumberland County, Maine | 283,921 |
| 2 | York County, Maine | 199,005 |
| 3 | Penobscot County, Maine | 153,746 |
| 4 | Kennebec County, Maine | 121,853 |
| 5 | Androscoggin County, Maine | 107,609 |
| 6 | Aroostook County, Maine | 70,868 |
| 7 | Oxford County, Maine | 57,481 |
| 8 | Hancock County, Maine | 54,558 |
| 9 | Somerset County, Maine | 51,910 |
| 10 | Knox County, Maine | 39,668 |
| 11 | Waldo County, Maine | 38,820 |
| 12 | Sagadahoc County, Maine | 35,191 |
| 13 | Lincoln County, Maine | 34,180 |
| 14 | Washington County, Maine | 32,462 |
| 15 | Franklin County, Maine | 30,630 |
| 16 | Piscataquis County, Maine | 17,290 |
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