Onslow County Map, North Carolina

Onslow County map

The Onslow County map at right shows Onslow County highlighted on the official North Carolina county boundary layer, sourced from the U.S. Census Bureau TIGER/Line shapefiles and NC OneMap. The map of Onslow County uses the county's true geographic outline — not a simplified illustration — so the boundary, neighboring counties, and the position of the county seat (Jacksonville) are all accurate to the official statewide GIS layer.

Use the interactive Onslow County, NC map to:

• See exactly where Onslow County sits within North Carolina and the Coastal Plain region.
• Identify the 4 counties that share a border with Onslow County.
• Compare Onslow County's size and shape to the other 99 NC counties.
• Locate Jacksonville, the Onslow County seat, relative to the rest of the state.

Need a printable or offline copy? Open the interactive NC county map and use Map Studio to export a Onslow County map as a free PDF, PNG, or SVG. The download includes the county boundary, the county seat marker, and the surrounding Coastal Plain region for context — suitable for classroom handouts, reports, or planning documents.

Where is Onslow County?

Onslow County is one of North Carolina's 100 counties and sits in the eastern flatland portion of the state, stretching from the inner fall line toward the Atlantic Ocean. The terrain is low, sandy, and frequently crossed by slow-moving rivers, swamps, and pocosins. Its county seat — the municipality that serves as the seat of local government — is Jacksonville. The county covers approximately 763 square miles of land area, ranking #12 of 100 NC counties by area.

On the statewide map at right, Onslow County is highlighted. Use the interactive NC county map to compare its position to neighboring counties, or browse the full directory of all 100 NC counties.

Neighboring counties map — counties that border Onslow County

Onslow County shares a land border with 4 counties inside North Carolina's 100-county system. Each neighbor below links to its own dedicated county map page, so you can step from the Onslow County map straight into the surrounding coastal plain landscape — useful for planning trips, comparing regional demographics, or studying how county lines were drawn.

Want the full picture? Open the interactive NC county map to pan, zoom, and inspect every county that touches Onslow County.

Population & density

The latest U.S. Census Bureau data recorded 204,576 residents in Onslow County, making it the 13th most populous of North Carolina's 100 counties and the 4th most populous of the 40 counties in the Coastal Plain region. Population density works out to approximately 268 people per square mile across 763 square miles of land area.

Onslow County's population represents roughly 1.96% of North Carolina's statewide total. For ranked comparisons across all 100 counties, see the full NC county population page, or jump straight to the largest counties or smallest counties lists.

Source: U.S. Census Bureau, latest available data (Decennial Census P1 totals plus annual Vintage population estimates). Figures are rounded; see our methodology for the full sourcing trail.

Geography & climate

Onslow County's terrain follows the broader pattern of the Coastal Plain region. The Mountains region is defined by Blue Ridge ridgelines, cool summers, frost-prone shoulder seasons, and snow at elevation; the Piedmont is rolling hills with hot, humid summers and mild winters; and the Coastal Plain is flat, sandy, and hurricane-exposed in late summer and early fall. Within the Coastal Plain, the Inner Coastal Plain transitions gradually from the Piedmont, while the Outer (Tidewater) Coastal Plain — closest to the Atlantic — is most exposed to coastal storms and tidal flooding.

For county-level climate data, the NOAA NCEI county-level climate page provides 30-year normals, monthly temperature and precipitation, and historical extremes. Hurricane and severe-weather climatology for North Carolina counties is published annually by the State Climate Office at NC State University.

Economy

Agriculture (hogs, poultry, tobacco, sweet potatoes), commercial fishing, coastal tourism, military installations, and forest products are the leading economic sectors.

Up-to-date county-level labor force, unemployment rate, average weekly wage, and industry-mix data for Onslow County are published by the U.S. Bureau of Labor Statistics (Quarterly Census of Employment and Wages and Local Area Unemployment Statistics) and by the North Carolina Department of Commerce's Labor & Economic Analysis Division (LEAD). For a non-statistical view, the county's own Economic Development office is typically the most current source for major employers and active industrial sites.

Cities & towns in Onslow County

Onslow County contains the following major incorporated places, ranked by population (most recent U.S. Census Bureau data):

Looking for a city not listed? See our full NC cities directory or the city-to-county lookup.

Government & civic data

Like all North Carolina counties, Onslow County is governed by an elected Board of County Commissioners and provides a standardized set of statutory services: the Register of Deeds, Sheriff's Office, county Board of Elections, Department of Social Services, Health Department, Tax Administration, and a court system under the unified state Administrative Office of the Courts. Jacksonville is the seat of county government and the location of the courthouse.

Public schools in Onslow County operate under one or more local education agencies (LEAs) overseen by the North Carolina Department of Public Instruction. Property records, parcel data, and county GIS layers are typically published through the county GIS or Tax department's portal and aggregated statewide on NC OneMap.

History

Onslow County was formed in 1734, before North Carolina's statehood, while the territory was still part of the Province of North Carolina. No additional counties have been created in North Carolina since 1911, and none have been dissolved or merged. Historic county-formation records are maintained by the North Carolina Department of the Secretary of State and the State Archives.

Frequently asked questions about Onslow County