Where is Miami County?

3 Miami Counties in 3 states · 183,361 people (2025)

There are 3 counties named Miami County in the United States, in Indiana, Kansas and Ohio. The most populous is Miami County, Ohio (county seat: Troy), with 112,634 people in 2025. 3 of them are named after Miami people, Native American nation originally found in what is now Indiana, Michigan, and Ohio.

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

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Miami County, IndianaPeru34,4873741832Miami people
Miami County, KansasPaola36,2405761855Miami people
Miami County, OhioTroy112,6344071807Miami people

Questions about Miami Counties

How many Miami Counties are there?

There are 3 Miami Counties in the United States, in Indiana, Kansas and Ohio.

Which Miami County is the largest?

By population, Miami County, Ohio (112,634 people in 2025). By land area, Miami County, Kansas (576 sq mi).

Which Miami County is the oldest?

Miami County, Ohio, established in 1807. The newest is Miami County, Kansas (1855).

Why are there so many Miami Counties?

3 of the 3 are named after Miami people, Native American nation originally found in what is now Indiana, Michigan, and Ohio. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Miami 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