Hillsborough County, New Hampshire
Hillsborough County, New Hampshire | |
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Manchester skyline | |
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Seal | |
Location within the U.S. state of New Hampshire | |
| Coordinates: 42°53′44″N 71°34′58″W / 42.895584°N 71.582741°W | |
| Country | United States |
| State | New Hampshire |
| Founded | 1769 |
| Named after | The Earl of Hillsborough |
| Seat | Manchester and Nashua |
| Largest city | Manchester |
| Area | |
• Total | 892.5 sq mi (2,312 km2) |
| • Land | 876.5 sq mi (2,270 km2) |
| • Water | 15.9 sq mi (41 km2) 1.8% |
| Population (2020) | |
• Total | 422,937 |
• Estimate (2024) | 430,462 |
| • Density | 491.1/sq mi (189.6/km2) |
| Time zone | UTC−5 (Eastern) |
| • Summer (DST) | UTC−4 (EDT) |
| Congressional districts | 1st, 2nd |
| Website | hcnh |
Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2020 census, the population was 422,937, almost one-third the population of the entire state. Its county seats are Manchester and Nashua, the state's two biggest cities. Hillsborough is northern New England's most populous county as well as its most densely populated.
Hillsborough County comprises the Manchester-Nashua, NH Metropolitan Statistical Area, which in turn constitutes a portion of the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.