What is the largest county in New Hampshire?
Hillsborough County is the largest county in New Hampshire with a population of 424,732, according to Census ACS 5-Year.
Context
New Hampshire has 10 counties.
Top 10
| Hillsborough County | 424,732 |
| Rockingham County | 317,163 |
| Merrimack County | 155,018 |
| Strafford County | 131,743 |
| Grafton County | 91,759 |
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Frequently Asked Questions
Hillsborough County is the largest county in New Hampshire with a population of 424,732, according to Census ACS 5-Year.