| Rank | County | Percentage with High School Diploma |
|---|---|---|
| 1 | Cumberland County, Maine | 93.6% |
| 2 | Sagadahoc County, Maine | 92.3% |
| 3 | Lincoln County, Maine | 92.3% |
| 4 | Hancock County, Maine | 91.7% |
| 5 | Kennebec County, Maine | 90.9% |
| 6 | York County, Maine | 90.9% |
| 7 | Knox County, Maine | 90.3% |
| 8 | Waldo County, Maine | 90.0% |
| 9 | Penobscot County, Maine | 89.9% |
| 10 | Franklin County, Maine | 88.7% |
| 11 | Oxford County, Maine | 88.2% |
| 12 | Piscataquis County, Maine | 87.9% |
| 13 | Androscoggin County, Maine | 87.0% |
| 14 | Somerset County, Maine | 86.7% |
| 15 | Washington County, Maine | 85.9% |
| 16 | Aroostook County, Maine | 84.2% |
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