All Counties › North Carolina
Onslow County, North Carolina
Onslow County lies on North Carolina's southeastern coast, dominated by Camp Lejeune and Marine Corps Air Station New River, with Jacksonville as its seat and Swansboro, Richlands, and Holly Ridge as other growth towns. The Marine Corps drives the local economy and steady military-family turnover, while Camp Lejeune's boundary, AICUZ noise-zone limits, and CAMA coastal permitting shape where new subdivisions and waterfront lots can be built.
Open the live Onslow County map →
Onslow County at a glance
- 217,000Population (2025)
- JacksonvilleCounty seat
- 762 sq miLand area
- 285 / sq miDensity
- $68,000Median household income
- $235,000Median home value
What the live Onslow County map shows
Free in your browser, nothing to download:
- City Boundaries: 6
- School Boundaries - Elementary: 23
- School Boundaries - Middle: 7
- School Boundaries - High: 7
- Congressional Districts: 2
- Soils: 67
- State House Districts: 6
- State Senate Districts: 3
- Development News: 2
Cities and towns in Onslow County
Holly Ridge, Jacksonville, North Topsail Beach, Richlands, Surf City, Swansboro.