Sullivan County, New Hampshire

Sullivan County
Location within the U.S. state of New Hampshire
New Hampshire's location within the U.S.
Coordinates: 43°20′39″N 72°14′50″W / 43.3442°N 72.2472°W / 43.3442; -72.2472
Country United States
State New Hampshire
Founded1827
Named afterJohn Sullivan
SeatNewport
Largest cityClaremont
Area
  Total
552.1 sq mi (1,430 km2)
  Land537.5 sq mi (1,392 km2)
  Water14.6 sq mi (38 km2)  2.6%
Population
 (2020)
  Total
43,063
  Density80.1/sq mi (30.9/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district2nd
Websitesullivancountynh.gov

Sullivan County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 43,063, making it the second-least populous county in New Hampshire. Its county seat is Newport.

Sullivan County is included in the Claremont-Lebanon, NH-VT Micropolitan Statistical Area.