Where is Harrison County?

8 Harrison Counties in 8 states · 450,351 people (2025)

There are 8 counties named Harrison County in the United States, in Indiana, Iowa, Kentucky, Mississippi, Missouri, Ohio, Texas and West Virginia. The most populous is Harrison County, Mississippi (county seat: Biloxi, Gulfport), with 217,136 people in 2025. 4 of them are named after William Henry Harrison, president of the United States in 1841 (1773-1841).

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

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Harrison County, IndianaCorydon40,4374841808William Henry Harrison
Harrison County, IowaLogan14,6236971851William Henry Harrison
Harrison County, KentuckyCynthiana19,6273071793Benjamin Harrison V
Harrison County, MississippiBiloxi, Gulfport217,1365741841William Henry Harrison
Harrison County, MissouriBethany8,2817231843Albert Galliton Harrison
Harrison County, OhioCadiz14,0704021813William Henry Harrison
Harrison County, TexasMarshall71,9569001839Jonas Harrison
Harrison County, West VirginiaClarksburg64,2214161784Benjamin Harrison V

Questions about Harrison Counties

How many Harrison Counties are there?

There are 8 Harrison Counties in the United States, in Indiana, Iowa, Kentucky, Mississippi, Missouri, Ohio, Texas and West Virginia.

Which Harrison County is the largest?

By population, Harrison County, Mississippi (217,136 people in 2025). By land area, Harrison County, Texas (900 sq mi).

Which Harrison County is the oldest?

Harrison County, West Virginia, established in 1784. The newest is Harrison County, Iowa (1851).

Why are there so many Harrison Counties?

4 of the 8 are named after William Henry Harrison, president of the United States in 1841 (1773-1841). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Harrison 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.

What county am I in? →

Other common county names