County Maps US

Allendale County, South Carolina

The least populous of South Carolina's 46 counties.

CountyFIPS 45005

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

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Population
7,355
-585 (-7.4%) since 2020
Land area
408.1
square miles. A further 1.0% of the total area is water
Population density
18.0
people per square mile, computed rather than published
County seat
Allendale
Seat of county government.
Established
1919
106 years ago
Largest city
Allendale town
Population 2,427.

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 Allendale 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 Allendale 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 747 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 Allendale 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
Population7,35546th of 462,631st of 3,144
Land area408.1 sq mi41st of 462,479th of 3,144
Population density18.0 per sq mi46th of 462,306th of 3,144
Median household income$32,32846th of 463,133rd of 3,143

Full data for Allendale County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population7,355Vintage 2025 Population Estimates
Population in 20207,940Vintage 2025 Population Estimates
2020 estimates base?8,037Vintage 2025 Population Estimates
Land area408.1 sq mi2025 Gazetteer Files
Water area4.3 sq mi2025 Gazetteer Files
Total area412.4 sq mi2025 Gazetteer Files
Population density?18.0 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$32,328American Community Survey 2020-2024 5-Year Estimates
Median home value$76,200American Community Survey 2020-2024 5-Year Estimates
Median age44.7American Community Survey 2020-2024 5-Year Estimates
Households3,238American Community Survey 2020-2024 5-Year Estimates
Housing units4,050American 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
-52
71 births, 123 deaths
Net migration
-122
More people moved out than moved in.

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

The 6 areas bordering Allendale 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
Screven CountyGeorgia45 mi14,408
Hampton CountySouth Carolina31 mi18,174
Barnwell CountySouth Carolina27 mi20,653
Burke CountyGeorgia12 mi24,408
Bamberg CountySouth Carolina10 mi12,796
Colleton CountySouth Carolinaa single point39,382

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.