New Hampshire counties ranked by the diversity index, the chance that two public school students picked at random from the county belong to different racial or ethnic groups. Counties need at least 3 schools and 1,000 students to qualify. The median ranked county is at 23.0%.
| # | County | State | Diversity index |
|---|---|---|---|
| 1 | Hillsborough County | NH | 48.6% |
| 2 | Strafford County | NH | 27.7% |
| 3 | Rockingham County | NH | 25.1% |
| 4 | Merrimack County | NH | 24.1% |
| 5 | Grafton County | NH | 23.0% |
| 6 | Cheshire County | NH | 20.1% |
| 7 | Sullivan County | NH | 18.4% |
| 8 | Belknap County | NH | 17.1% |
| 9 | Coos County | NH | 15.8% |