Onslow County, North Carolina

Onslow County
Onslow County Courthouse
Location within the U.S. state of North Carolina
North Carolina's location within the U.S.
Coordinates: 34°46′N 77°30′W / 34.76°N 77.50°W / 34.76; -77.50
Country United States
State North Carolina
Founded1734
Named afterArthur Onslow
SeatJacksonville
Largest communityJacksonville
Area
  Total
905.20 sq mi (2,344.5 km2)
  Land762.08 sq mi (1,973.8 km2)
  Water143.12 sq mi (370.7 km2)  15.81%
Population
 (2020)
  Total
204,576
  Estimate 
(2023)
213,676
  Density268.44/sq mi (103.65/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district3rd
Websitewww.onslowcountync.gov

Onslow County is a county located in the U.S. state of North Carolina. As of the 2020 census, the population was 204,576. Its county seat is Jacksonville. The county was created in 1734 as Onslow Precinct and gained county status in 1739. Onslow County comprises the Jacksonville, NC Metropolitan Statistical Area. The southern border of the county is the coast of the Atlantic Ocean.