Rockingham County, New Hampshire
Rockingham County, New Hampshire | |
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Aerial view of Portsmouth | |
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Flag Seal | |
Location within the U.S. state of New Hampshire | |
| Coordinates: 42°57′46″N 71°04′39″W / 42.962872°N 71.077621°W | |
| Country | United States |
| State | New Hampshire |
| Founded | 1769 |
| Named after | Charles Watson-Wentworth, 2nd Marquess of Rockingham |
| Seat | Brentwood |
| Largest town | Derry |
| Area | |
• Total | 795.2 sq mi (2,060 km2) |
| • Land | 695.4 sq mi (1,801 km2) |
| • Water | 99.9 sq mi (259 km2) 12.6% |
| Population (2020) | |
• Total | 314,176 |
• Estimate (2024) | 322,433 |
| • Density | 451.8/sq mi (174.4/km2) |
| Time zone | UTC−5 (Eastern) |
| • Summer (DST) | UTC−4 (EDT) |
| Congressional districts | 1st, 2nd |
| Website | rockinghamcountynh |
Rockingham County is the easternmost county in the U.S. state of New Hampshire. As of the 2020 census, the population was 314,176, making it New Hampshire's second-most populous county. The county seat is Brentwood. Rockingham County is part of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area and the greater Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area. Per the 2020 census, it was New Hampshire's fastest growing county from 2010 to 2020.
As of 2014–2018 estimates from the American Community Survey, Rockingham County was the fourth- wealthiest county in New England, with a median household income of $90,429.