Where is Lamar County?

4 Lamar Counties in 4 states · 153,434 people (2025)

There are 4 counties named Lamar County in the United States, in Alabama, Georgia, Mississippi and Texas. The most populous is Lamar County, Mississippi (county seat: Purvis), with 67,403 people in 2025. 3 of them are named after Lucius Quintus Cincinnatus Lamar, American lawyer, politician and judge (1825-1893).

Map of the United States showing where all 4 Lamar Counties are, labeled by state
Every Lamar County in the United States (red), labeled with its state. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).

All 4 Lamar Counties

Sorted by state. Each link opens the county's map.

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Lamar County, AlabamaVernon13,5876051867Lucius Quintus Cincinnatus Lamar
Lamar County, GeorgiaBarnesville20,9411841920Lucius Quintus Cincinnatus Lamar
Lamar County, MississippiPurvis67,4034971904Lucius Quintus Cincinnatus Lamar
Lamar County, TexasParis51,5039071840Mirabeau B. Lamar

Questions about Lamar Counties

How many Lamar Counties are there?

There are 4 Lamar Counties in the United States, in Alabama, Georgia, Mississippi and Texas.

Which Lamar County is the largest?

By population, Lamar County, Mississippi (67,403 people in 2025). By land area, Lamar County, Texas (907 sq mi).

Which Lamar County is the oldest?

Lamar County, Texas, established in 1840. The newest is Lamar County, Georgia (1920).

Why are there so many Lamar Counties?

3 of the 4 are named after Lucius Quintus Cincinnatus Lamar, American lawyer, politician and judge (1825-1893). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Lamar County an address is in?

Open the county map of the state: it has a search box for cities, towns and ZIP codes. On a phone, the "what county am I in" tool on our sister site uses your location.

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Other common county names