Allendale County, South Carolina

Allendale County population, land area and income

Allendale County had 7,551 residents in the Census Vintage 2024 estimate, on 408.1 square miles of land. It ranks 46th of 46 in South Carolina by population and 41st by land area. That works out to 18.5 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in South Carolina has 60,098 residents, so Allendale County has 13% of the typical county's population.

Its SAIPE 2023 median household income of $35,477 is in the bottom quarter among 3,143 counties with an estimate.

How Allendale County's population changed since 2020

Allendale County lost 383 residents between the July 2020 and July 2024 estimates, a drop of 4.8%. That ranks 46th 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, Allendale County recorded 297 births and 534 deaths, a natural change of -237. Net international migration added +25 and net domestic migration, people moving to or from other US counties, came to -262. The largest single component was domestic migration, which removed 262 people.

Where Allendale County is

The Census internal point of Allendale County is at 32.979800, -81.363300. 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 Allendale County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Allendale County

2 incorporated places of 1,000+ people have residents in Allendale County, 3,885 people together, or 51% of the county. Each figure counts only the part of the town inside Allendale County; towns marked "part" extend into another county. The largest is Allendale with 2,496.

Counties bordering Allendale County

The Census 2024 county adjacency file lists 6 neighbors for Allendale County, including 2 across a state line. The most populous is Colleton County, SC, with 39,259 residents. Distances run between Census internal points in a straight line.

• Colleton County

  39,259 people

  42 mi ESE

• GA

  Burke County, GA

  24,472 people

  37 mi W

• Barnwell County

  20,495 people

  20 mi NNW

• Hampton County

  18,172 people

  19 mi SE

• GA

  Screven County, GA

  14,325 people

  22 mi SW

• Bamberg County

  12,870 people

  24 mi NE

Distance to Columbia and the nearest big city

Columbia is 73.1 miles NNE of Allendale County's internal point in a straight line. The nearest place of 100,000 or more is Augusta-Richmond County, GA (population 201,737), 49.0 miles away. The nearest place of 10,000 or more is Aiken, SC (population 32,694), 43.5 miles away.

Allendale County FIPS code

The FIPS code of Allendale County is 45005: state code 45 for South Carolina plus county code 005. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $35,477.