Where is Iron County?

4 Iron Counties in 4 states · 94,343 people (2025)

There are 4 counties named Iron County in the United States, in Michigan, Missouri, Utah and Wisconsin. The most populous is Iron County, Utah (county seat: Parowan), with 67,141 people in 2025. 3 of them are named after iron, chemical element with symbol Fe and atomic number 26.

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

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Iron County, MichiganCrystal Falls11,7571,1661885iron
Iron County, MissouriIronton9,3185501857iron ore
Iron County, UtahParowan67,1413,2961850iron
Iron County, WisconsinHurley6,1277581893iron

Questions about Iron Counties

How many Iron Counties are there?

There are 4 Iron Counties in the United States, in Michigan, Missouri, Utah and Wisconsin.

Which Iron County is the largest?

By population, Iron County, Utah (67,141 people in 2025). By land area, Iron County, Utah (3,296 sq mi).

Which Iron County is the oldest?

Iron County, Utah, established in 1850. The newest is Iron County, Wisconsin (1893).

Why are there so many Iron Counties?

3 of the 4 are named after iron, chemical element with symbol Fe and atomic number 26. Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Iron 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