Lamar County, Georgia
County seat: Barnesville · Population 20,941 (2025) · 184 sq mi
Lamar County is the 89th most populous of Georgia's 159 counties, with 20,941 people (2025 estimate). Its county seat is Barnesville. It is part of the Three Rivers region, one of the 12 Georgia Regional Commissions. The map shows its 3 cities and towns and the 5 neighboring counties.
Lamar County facts
- County seat
- Barnesville
- Population (2025 estimate)
- 20,941 +13.2% since 2020
- Land area
- 184 sq mi 146th largest of 159
- Water area
- 2 sq mi
- Population density
- 114 per sq mi
- Established
- 1920
- Named after
- Lucius Quintus Cincinnatus Lamar American lawyer, politician and judge (1825-1893)
- Largest city
- Barnesville 6,329
- Median household income
- $67,062
- Cities and towns
- 3
- ZIP codes
- 9
- Time zone
- Eastern
- FIPS code
- 13171
Cities and towns in Lamar County
Lamar County has 3 incorporated cities, towns and villages. Populations count the people living inside Lamar County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Barnesville (county seat) | City | 6,329 | |
| Milner | City | 819 | |
| Aldora | Town | 192 |
ZIP codes in Lamar County
9 ZIP codes reach into Lamar County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 30204 also Upson and Monroe counties
- 30224 also Spalding and Pike counties
- 30233 also Butts, Monroe, Henry and Newton counties
- 30256 also Pike and Upson counties
- 30257 also Pike County
- 30285 also Upson and Pike counties
- 30295 also Pike County
- 31016 also Monroe, Upson and Crawford counties
- 31097 also Upson and Monroe counties
Population of Lamar County, 2020–2025
Lamar County grew by 2,436 people (+13.2%) between April 2020 and July 2025: 234 more deaths than births and a net gain of 2,577 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 18,555 |
| 2021 | 18,700 |
| 2022 | 19,465 |
| 2023 | 20,377 |
| 2024 | 20,639 |
| 2025 | 20,941 |
Neighboring counties
- Monroe County east · 32,023 people
- Pike County west · 20,932 people
- Upson County southwest · 28,500 people
- Spalding County northwest · 70,775 people
- Butts County northeast · 27,218 people
Printable Lamar County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (68 KB)
- PNG (2400 px) (62 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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