Where is Ottawa County?

4 Ottawa Counties in 4 states · 384,122 people (2025)

There are 4 counties named Ottawa County in the United States, in Kansas, Michigan, Ohio and Oklahoma. The most populous is Ottawa County, Michigan (county seat: Grand Haven), with 308,459 people in 2025. 4 of them are named after Odawa, indigenous people in what is known as Michigan and Ontario.

Map of the United States showing where all 4 Ottawa Counties are, labeled by state
Every Ottawa 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 4 Ottawa Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Ottawa County, KansasMinneapolis5,7447211860Odawa
Ottawa County, MichiganGrand Haven308,4595641831Odawa
Ottawa County, OhioPort Clinton39,4812551840Odawa
Ottawa County, OklahomaMiami30,4384711907Odawa

Questions about Ottawa Counties

How many Ottawa Counties are there?

There are 4 Ottawa Counties in the United States, in Kansas, Michigan, Ohio and Oklahoma.

Which Ottawa County is the largest?

By population, Ottawa County, Michigan (308,459 people in 2025). By land area, Ottawa County, Kansas (721 sq mi).

Which Ottawa County is the oldest?

Ottawa County, Michigan, established in 1831. The newest is Ottawa County, Oklahoma (1907).

Why are there so many Ottawa Counties?

4 of the 4 are named after Odawa, indigenous people in what is known as Michigan and Ontario. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Ottawa 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