Where is Lyon County?

5 Lyon Counties in 5 states · 144,515 people (2025)

There are 5 counties named Lyon County in the United States, in Iowa, Kansas, Kentucky, Minnesota and Nevada. The most populous is Lyon County, Nevada (county seat: Yerington), with 65,088 people in 2025. 4 of them are named after Nathaniel Lyon, first Union general to be killed in the American Civil War.

Map of the United States showing where all 5 Lyon Counties are, labeled by state
Every Lyon 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 5 Lyon Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Lyon County, IowaRock Rapids12,3545881851Nathaniel Lyon
Lyon County, KansasEmporia32,2668481855Nathaniel Lyon
Lyon County, KentuckyEddyville9,1232141854Chittenden Lyon
Lyon County, MinnesotaMarshall25,6847141869Nathaniel Lyon
Lyon County, NevadaYerington65,0882,0031861Nathaniel Lyon

Questions about Lyon Counties

How many Lyon Counties are there?

There are 5 Lyon Counties in the United States, in Iowa, Kansas, Kentucky, Minnesota and Nevada.

Which Lyon County is the largest?

By population, Lyon County, Nevada (65,088 people in 2025). By land area, Lyon County, Nevada (2,003 sq mi).

Which Lyon County is the oldest?

Lyon County, Iowa, established in 1851. The newest is Lyon County, Minnesota (1869).

Why are there so many Lyon Counties?

4 of the 5 are named after Nathaniel Lyon, first Union general to be killed in the American Civil War. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Lyon 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