Where Is Hardin County? All 6 Hardin Counties on a Map

Where is Hardin County?

6 Hardin Counties in 6 states · 250,303 people (2025)

There are 6 counties named Hardin County in the United States, in Illinois, Iowa, Kentucky, Ohio, Tennessee and Texas. The most populous is Hardin County, Kentucky (county seat: Elizabethtown), with 113,482 people in 2025. 3 of them are named after John Hardin, Revolutionary War Militia Officer & Indian Fighter.

All 6 Hardin Counties

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

State	County seat	Population 2025	Land area (sq mi)	Established	Named after
Hardin County, Illinois	Elizabethtown	3,588	177	1839	John Hardin
Hardin County, Iowa	Eldora	16,455	569	1851	John J. Hardin
Hardin County, Kentucky	Elizabethtown	113,482	624	1792	John Hardin
Hardin County, Ohio	Kenton	30,072	470	1820	John Hardin
Hardin County, Tennessee	Savannah	27,983	578	1819	Joseph Hardin
Hardin County, Texas	Kountze	58,723	891	1858	–

Questions about Hardin Counties

How many Hardin Counties are there?

There are 6 Hardin Counties in the United States, in Illinois, Iowa, Kentucky, Ohio, Tennessee and Texas.

Which Hardin County is the largest?

By population, Hardin County, Kentucky (113,482 people in 2025). By land area, Hardin County, Texas (891 sq mi).

Which Hardin County is the oldest?

Hardin County, Kentucky, established in 1792. The newest is Hardin County, Texas (1858).

Why are there so many Hardin Counties?

3 of the 6 are named after John Hardin, Revolutionary War Militia Officer & Indian Fighter. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Hardin 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? →