County Maps US

Lamar County, Georgia

A county in Georgia, ranked 89 of 159 by population.

CountyFIPS 13171

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

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Population
20,941
+2,386 (+12.9%) since 2020
Land area
183.5
square miles. A further 1.3% of the total area is water
Population density
114
people per square mile, computed rather than published
County seat
Barnesville
Seat of county government.
Established
1920
105 years ago
Largest city
Barnesville city
Population 6,329.

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 Lamar 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 Lamar County, Georgia 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 591 by 800 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 Lamar County ranks

Position among the 159 counties of Georgia, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn GeorgiaNationally
Population20,94189th of 1591,776th of 3,144
Land area183.5 sq mi146th of 1593,025th of 3,144
Population density114 per sq mi58th of 159827th of 3,144
Median household income$67,06253rd of 1591,431st of 3,143

Full data for Lamar County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population20,941Vintage 2025 Population Estimates
Population in 202018,555Vintage 2025 Population Estimates
2020 estimates base?18,505Vintage 2025 Population Estimates
Land area183.5 sq mi2025 Gazetteer Files
Water area2.3 sq mi2025 Gazetteer Files
Total area185.8 sq mi2025 Gazetteer Files
Population density?114 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$67,062American Community Survey 2020-2024 5-Year Estimates
Median home value$216,500American Community Survey 2020-2024 5-Year Estimates
Median age39.2American Community Survey 2020-2024 5-Year Estimates
Households7,133American Community Survey 2020-2024 5-Year Estimates
Housing units7,866American 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
-21
255 births, 276 deaths
Net migration
+323
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 5 areas bordering Lamar 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
Monroe CountyGeorgia23 mi32,023
Pike CountyGeorgia15 mi20,932
Upson CountyGeorgia13 mi28,500
Spalding CountyGeorgia9.4 mi70,775
Butts CountyGeorgia4.8 mi27,218

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 159 counties of Georgia

Open the interactive Georgia county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.