Where is Marshall County?

12 Marshall Counties in 12 states · 374,373 people (2025)

There are 12 counties named Marshall County in the United States, in Alabama, Illinois, Indiana, Iowa, Kansas, Kentucky, Minnesota, Mississippi, Oklahoma, South Dakota, Tennessee and West Virginia. The most populous is Marshall County, Alabama (county seat: Guntersville), with 103,537 people in 2025. 8 of them are named after John Marshall, chief justice of the United States from 1801 to 1835, (1755-1835).

Map of the United States showing where all 12 Marshall Counties are, labeled by state
Every Marshall 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 12 Marshall Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Marshall County, AlabamaGuntersville103,5375661836John Marshall
Marshall County, IllinoisLacon11,4733871839John Marshall
Marshall County, IndianaPlymouth46,5994441835John Marshall
Marshall County, IowaMarshalltown39,8905731846John Marshall
Marshall County, KansasMarysville9,8529001855Frank J. Marshall
Marshall County, KentuckyBenton31,6593021842John Marshall
Marshall County, MinnesotaWarren8,7981,7751879William Rainey Marshall
Marshall County, MississippiHolly Springs34,6547061836John Marshall
Marshall County, OklahomaMadill16,2553721907Miss Marshall
Marshall County, South DakotaBritton4,4268381885Marshall Vincent
Marshall County, TennesseeLewisburg38,0713761836John Marshall
Marshall County, West VirginiaMoundsville29,1593051835John Marshall

Questions about Marshall Counties

How many Marshall Counties are there?

There are 12 Marshall Counties in the United States, in Alabama, Illinois, Indiana, Iowa, Kansas, Kentucky, Minnesota, Mississippi, Oklahoma, South Dakota, Tennessee and West Virginia.

Which Marshall County is the largest?

By population, Marshall County, Alabama (103,537 people in 2025). By land area, Marshall County, Minnesota (1,775 sq mi).

Which Marshall County is the oldest?

Marshall County, Indiana, established in 1835. The newest is Marshall County, Oklahoma (1907).

Why are there so many Marshall Counties?

8 of the 12 are named after John Marshall, chief justice of the United States from 1801 to 1835, (1755-1835). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Marshall 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