Rockingham County
Sign in to savecounty in New Hampshire, United States
Key facts
- Country
- United States
- State
- New Hampshire
- Named after
- Charles Watson-Wentworth, 2nd Marquess of Rockingham
- Seat
- Brentwood
- Largest town
- Derry
- Total
- 795.2 sq mi (2,060 km )
- Land
- 695.4 sq mi (1,801 km )
- Water
- 99.9 sq mi (259 km ) 12.6%
- Estimate 2025
- 324,077
- Density
- 451.8/sq mi (174.4/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
- Congressional districts
- 1st , 2nd
- Website
- rockinghamcountynh .org
via Wikipedia infobox
Article
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.