Marion County, South Carolina

Marion County population, land area and income

Marion County had 28,368 residents in the Census Vintage 2024 estimate, on 489.4 square miles of land. It ranks 33rd of 46 in South Carolina by population and 36th by land area. That works out to 58.0 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in South Carolina has 60,098 residents, so Marion County has 47% of the typical county's population.

Its SAIPE 2023 median household income of $40,171 is in the bottom quarter among 3,143 counties with an estimate.

How Marion County's population changed since 2020

Marion County lost 714 residents between the July 2020 and July 2024 estimates, a drop of 2.5%. That ranks 40th 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, Marion County recorded 1,306 births and 2,143 deaths, a natural change of -837. Net international migration added +2 and net domestic migration, people moving to or from other US counties, came to +6. The largest single component was natural change, which removed 837 people.

Where Marion County is

The Census internal point of Marion County is at 34.083600, -79.354000. 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 Marion County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Marion County

2 incorporated places of 1,000+ people have residents in Marion County, 9,914 people together, or 35% of the county. Each figure counts only the part of the town inside Marion County; towns marked "part" extend into another county. The largest is Marion with 6,068.

Counties bordering Marion County

The Census 2024 county adjacency file lists 5 neighbors for Marion County. The most populous is Horry County, SC, with 413,391 residents. Distances run between Census internal points in a straight line.

• Horry County

  413,391 people

  25 mi ESE

• Florence County

  138,049 people

  21 mi W

• Georgetown County

  66,035 people

  46 mi S

• Williamsburg County

  29,865 people

  38 mi SSW

• Dillon County

  27,577 people

  21 mi N

Distance to Columbia and the nearest big city

Columbia is 96.4 miles W of Marion County's internal point in a straight line. The nearest place of 100,000 or more is Fayetteville, NC (population 209,496), 72.3 miles away. The nearest place of 10,000 or more is Conway, SC (population 29,656), 24.5 miles away.

Marion County FIPS code

The FIPS code of Marion County is 45067: state code 45 for South Carolina plus county code 067. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $40,171.