Where is Columbia County?

8 Columbia Counties in 8 states · 507,902 people (2025)

There are 8 counties named Columbia County in the United States, in Arkansas, Florida, Georgia, New York, Oregon, Pennsylvania, Washington and Wisconsin. The most populous is Columbia County, Georgia (county seat: Appling), with 169,189 people in 2025. 5 of them are named after Christopher Columbus, Italian navigator, explorer, and colonist (1451–1506).

Map of the United States showing where all 8 Columbia Counties are, labeled by state
Every Columbia 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 8 Columbia Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Columbia County, ArkansasMagnolia21,8947661852Christopher Columbus
Columbia County, FloridaLake City74,0947971832Columbia
Columbia County, GeorgiaAppling169,1892901790Christopher Columbus
Columbia County, New YorkHudson60,1686351786Christopher Columbus
Columbia County, OregonSt. Helens54,0916591854Columbia River
Columbia County, PennsylvaniaBloomsburg66,1934831813Christopher Columbus
Columbia County, WashingtonDayton4,1418691875Columbia River
Columbia County, WisconsinPortage58,1327661846Christopher Columbus

Questions about Columbia Counties

How many Columbia Counties are there?

There are 8 Columbia Counties in the United States, in Arkansas, Florida, Georgia, New York, Oregon, Pennsylvania, Washington and Wisconsin.

Which Columbia County is the largest?

By population, Columbia County, Georgia (169,189 people in 2025). By land area, Columbia County, Washington (869 sq mi).

Which Columbia County is the oldest?

Columbia County, New York, established in 1786. The newest is Columbia County, Washington (1875).

Why are there so many Columbia Counties?

5 of the 8 are named after Christopher Columbus, Italian navigator, explorer, and colonist (1451–1506). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Columbia 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