Where is Cass County?

9 Cass Counties in 9 states · 520,327 people (2025)

There are 9 counties named Cass County in the United States, in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Nebraska, North Dakota and Texas. The most populous is Cass County, North Dakota (county seat: Fargo), with 201,794 people in 2025. 8 of them are named after Lewis Cass, American politician (1782-1866).

Map of the United States showing where all 9 Cass Counties are, labeled by state
Every Cass 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 9 Cass Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Cass County, IllinoisVirginia12,4633761837Lewis Cass
Cass County, IndianaLogansport37,8364121829Lewis Cass
Cass County, IowaAtlantic12,9605641851Lewis Cass
Cass County, MichiganCassopolis51,6774901829Lewis Cass
Cass County, MinnesotaWalker31,4302,0221851Lewis Cass
Cass County, MissouriHarrisonville115,8596971833Lewis Cass
Cass County, NebraskaPlattsmouth27,6575571854Lewis Cass
Cass County, North DakotaFargo201,7941,7651873George Washington Cass
Cass County, TexasLinden28,6519371846Lewis Cass

Questions about Cass Counties

How many Cass Counties are there?

There are 9 Cass Counties in the United States, in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Nebraska, North Dakota and Texas.

Which Cass County is the largest?

By population, Cass County, North Dakota (201,794 people in 2025). By land area, Cass County, Minnesota (2,022 sq mi).

Which Cass County is the oldest?

Cass County, Indiana, established in 1829. The newest is Cass County, North Dakota (1873).

Why are there so many Cass Counties?

8 of the 9 are named after Lewis Cass, American politician (1782-1866). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Cass 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.

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Other common county names