County Maps US

Richland County, South Carolina

A county in South Carolina, ranked 3 of 46 by population.

CountyFIPS 45079

Within South Carolina
Richland County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Columbia, the county seat, located via the 2025 Census Gazetteer.

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Population
434,956
+19,201 (+4.6%) since 2020
Land area
757.3
square miles. A further 1.9% of the total area is water
Population density
574
people per square mile, computed rather than published
County seat
Columbia
Seat of county government.
Established
1785
240 years ago
Largest city
Columbia city
Population 146,401 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Richland County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Richland County, South Carolina from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 690 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Richland County ranks

Position among the 46 counties of South Carolina, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn South CarolinaNationally
Population434,9563rd of 46173rd of 3,144
Land area757.3 sq mi13th of 461,161st of 3,144
Population density574 per sq mi2nd of 46255th of 3,144
Median household income$63,78417th of 461,722nd of 3,143

Full data for Richland County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population434,956Vintage 2025 Population Estimates
Population in 2020415,755Vintage 2025 Population Estimates
2020 estimates base?416,131Vintage 2025 Population Estimates
Land area757.3 sq mi2025 Gazetteer Files
Water area14.7 sq mi2025 Gazetteer Files
Total area772 sq mi2025 Gazetteer Files
Population density?574 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$63,784American Community Survey 2020-2024 5-Year Estimates
Median home value$242,800American Community Survey 2020-2024 5-Year Estimates
Median age34.4American Community Survey 2020-2024 5-Year Estimates
Households167,961American Community Survey 2020-2024 5-Year Estimates
Housing units187,611American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+1,012
4,572 births, 3,560 deaths
Net migration
+3,117
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Richland County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Sumter CountySouth Carolina48 mi105,067
Calhoun CountySouth Carolina41 mi14,188
Fairfield CountySouth Carolina37 mi20,340
Lexington CountySouth Carolina36 mi317,588
Kershaw CountySouth Carolina25 mi73,166
Newberry CountySouth Carolina3.5 mi39,561

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 46 counties of South Carolina

Open the interactive South Carolina county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.