| Rank | County | Percentage with High School Diploma |
|---|---|---|
| 1 | Rockingham County, New Hampshire | 93.9% |
| 2 | Merrimack County, New Hampshire | 91.8% |
| 3 | Carroll County, New Hampshire | 91.1% |
| 4 | Grafton County, New Hampshire | 91.0% |
| 5 | Hillsborough County, New Hampshire | 90.5% |
| 6 | Strafford County, New Hampshire | 90.3% |
| 7 | Sullivan County, New Hampshire | 90.1% |
| 8 | Cheshire County, New Hampshire | 90.0% |
| 9 | Belknap County, New Hampshire | 89.8% |
| 10 | Coos County, New Hampshire | 84.5% |
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