County Maps US

Sumter County, South Carolina

A county in South Carolina, ranked 16 of 46 by population.

CountyFIPS 45085

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

Download SVGFull South Carolina map downloads

Population
105,067
-342 (-0.3%) since 2020
Land area
665.1
square miles. A further 2.5% of the total area is water
Population density
158
people per square mile, computed rather than published
County seat
Sumter
Seat of county government.
Established
1800
225 years ago
Largest city
Sumter city
Population 43,094.

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 Sumter 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 Sumter 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 685 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 Sumter 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
Population105,06716th of 46598th of 3,144
Land area665.1 sq mi20th of 461,413th of 3,144
Population density158 per sq mi16th of 46674th of 3,144
Median household income$56,69324th of 462,361st of 3,143

Full data for Sumter County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population105,067Vintage 2025 Population Estimates
Population in 2020105,409Vintage 2025 Population Estimates
2020 estimates base?105,557Vintage 2025 Population Estimates
Land area665.1 sq mi2025 Gazetteer Files
Water area17.0 sq mi2025 Gazetteer Files
Total area682.1 sq mi2025 Gazetteer Files
Population density?158 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$56,693American Community Survey 2020-2024 5-Year Estimates
Median home value$165,300American Community Survey 2020-2024 5-Year Estimates
Median age38.0American Community Survey 2020-2024 5-Year Estimates
Households41,083American Community Survey 2020-2024 5-Year Estimates
Housing units47,582American 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
+9
1,300 births, 1,291 deaths
Net migration
+256
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 Sumter 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
Richland CountySouth Carolina48 mi434,956
Clarendon CountySouth Carolina46 mi31,043
Lee CountySouth Carolina43 mi15,730
Florence CountySouth Carolina17 mi138,504
Calhoun CountySouth Carolina11 mi14,188
Kershaw CountySouth Carolina11 mi73,166

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.