Where is Linn County?

4 Linn Counties in 4 states · 386,636 people (2025)

There are 4 counties named Linn County in the United States, in Iowa, Kansas, Missouri and Oregon. The most populous is Linn County, Iowa (county seat: Cedar Rapids), with 232,028 people in 2025. 4 of them are named after Lewis F. Linn, Jacksonian Democratic U.S. Senator for the state of Missouri born in Kentucky (1796-1843).

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

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Linn County, IowaCedar Rapids232,0287171837Lewis F. Linn
Linn County, KansasMound City9,9505941855Lewis F. Linn
Linn County, MissouriLinneus11,8156161837Lewis F. Linn
Linn County, OregonAlbany132,8432,2901847Lewis F. Linn

Questions about Linn Counties

How many Linn Counties are there?

There are 4 Linn Counties in the United States, in Iowa, Kansas, Missouri and Oregon.

Which Linn County is the largest?

By population, Linn County, Iowa (232,028 people in 2025). By land area, Linn County, Oregon (2,290 sq mi).

Which Linn County is the oldest?

Linn County, Iowa, established in 1837. The newest is Linn County, Kansas (1855).

Why are there so many Linn Counties?

4 of the 4 are named after Lewis F. Linn, Jacksonian Democratic U.S. Senator for the state of Missouri born in Kentucky (1796-1843). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Linn 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