Where is Ohio County?

3 Ohio Counties in 3 states · 70,424 people (2025)

There are 3 counties named Ohio County in the United States, in Indiana, Kentucky and West Virginia. The most populous is Ohio County, West Virginia (county seat: Wheeling), with 40,496 people in 2025. 3 of them are named after Ohio River, river in the midwestern United States.

Map of the United States showing where all 3 Ohio Counties are, labeled by state
Every Ohio 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 3 Ohio Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Ohio County, IndianaRising Sun5,994861844Ohio River
Ohio County, KentuckyHartford23,9345871798Ohio River
Ohio County, West VirginiaWheeling40,4961061776Ohio River

Questions about Ohio Counties

How many Ohio Counties are there?

There are 3 Ohio Counties in the United States, in Indiana, Kentucky and West Virginia.

Which Ohio County is the largest?

By population, Ohio County, West Virginia (40,496 people in 2025). By land area, Ohio County, Kentucky (587 sq mi).

Which Ohio County is the oldest?

Ohio County, West Virginia, established in 1776. The newest is Ohio County, Indiana (1844).

Why are there so many Ohio Counties?

3 of the 3 are named after Ohio River, river in the midwestern United States. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Ohio 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