Johnston County Map, North Carolina

Johnston County map

The Johnston County map at right shows Johnston 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 Johnston County uses the county's true geographic outline — not a simplified illustration — so the boundary, neighboring counties, and the position of the county seat (Smithfield) are all accurate to the official statewide GIS layer.

Use the interactive Johnston County, NC map to:

• See exactly where Johnston County sits within North Carolina and the Coastal Plain region.
• Identify the 6 counties that share a border with Johnston County.
• Compare Johnston County's size and shape to the other 99 NC counties.
• Locate Smithfield, the Johnston 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 Johnston 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 Johnston County?

Johnston 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 Smithfield. The county covers approximately 791 square miles of land area, ranking #10 of 100 NC counties by area.

On the statewide map at right, Johnston 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 Johnston County

Johnston County shares a land border with 6 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 Johnston 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 Johnston County.

Population & density

The latest U.S. Census Bureau data recorded 215,999 residents in Johnston County, making it the 12th most populous of North Carolina's 100 counties and the 3rd most populous of the 40 counties in the Coastal Plain region. Population density works out to approximately 273 people per square mile across 791 square miles of land area.

Johnston County's population represents roughly 2.07% 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

Johnston 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 Johnston 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 Johnston County

Johnston County's largest community is its county seat, Smithfield. The county also contains a number of smaller unincorporated communities and townships. For a comprehensive list of every incorporated municipality statewide, see our NC cities directory.

Government & civic data

Like all North Carolina counties, Johnston 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. Smithfield is the seat of county government and the location of the courthouse.

Public schools in Johnston 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

Johnston County was formed in 1746, 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 Johnston County