Sumter County, South Carolina

Sumter County population, land area and income

Sumter County had 104,776 residents in the Census Vintage 2024 estimate, on 665.1 square miles of land. It ranks 16th of 46 in South Carolina by population and 20th by land area. That works out to 157.5 people per square mile, 1.6 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in South Carolina has 60,098 residents; Sumter County is somewhat larger.

Its SAIPE 2023 median household income of $55,481 is below the national county median among 3,143 counties with an estimate.

How Sumter County's population changed since 2020

Sumter County lost 717 residents between the July 2020 and July 2024 estimates, a drop of 0.7%. That ranks 35th of 46 in South Carolina for growth. The median South Carolina county changed by +2.9%, and the state as a whole by +6.8%.

Since the April 2020 estimates base, Sumter County recorded 5,662 births and 5,802 deaths, a natural change of -140. Net international migration added +394 and net domestic migration, people moving to or from other US counties, came to -1,071. The largest single component was domestic migration, which removed 1,071 people.

Where Sumter County is

The Census internal point of Sumter County is at 33.916100, -80.382400. It sits in UTM zone 17N. The map shades South Carolina's 46 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Sumter County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Sumter County

One incorporated place of 1,000+ people has residents in Sumter County, 42,958 people together, or 41% of the county. Each figure counts only the part of the town inside Sumter County; towns marked "part" extend into another county. The largest is Sumter with 42,958.

Counties bordering Sumter County

The Census 2024 county adjacency file lists 6 neighbors for Sumter County. The most populous is Richland County, SC, with 430,651 residents. Distances run between Census internal points in a straight line.

• Richland County

  430,651 people

  31 mi WNW

• Florence County

  138,049 people

  39 mi ENE

• Kershaw County

  71,698 people

  32 mi NNW

• Clarendon County

  31,030 people

  20 mi SSE

• Lee County

  15,958 people

  18 mi NNE

• Calhoun County

  14,249 people

  28 mi SW

Distance to Columbia and the nearest big city

Columbia is 37.9 miles W of Sumter County's internal point in a straight line. The nearest place of 100,000 or more is Columbia, SC (population 144,788), 31.2 miles away. The nearest place of 10,000 or more is Sumter, SC (population 42,958), 1.9 miles away.

Sumter County FIPS code

The FIPS code of Sumter County is 45085: state code 45 for South Carolina plus county code 085. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $55,481.