Where is Marion County?

17 Marion Counties in 17 states · 2.2 million people (2025)

There are 17 counties named Marion County in the United States, in Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Mississippi, Missouri, Ohio, Oregon, South Carolina, Tennessee, Texas and West Virginia. The most populous is Marion County, Indiana (county seat: Indianapolis), with 992,196 people in 2025. 17 of them are named after Francis Marion, American politician, Continental Army officer (1732-1795).

Map of the United States showing where all 17 Marion Counties are, labeled by state
Every Marion 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 17 Marion Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Marion County, AlabamaHamilton29,0977421818Francis Marion
Marion County, ArkansasYellville17,5935971835Francis Marion
Marion County, FloridaOcala442,6601,5881844Francis Marion
Marion County, GeorgiaBuena Vista7,6763661827Francis Marion
Marion County, IllinoisSalem36,3825731823Francis Marion
Marion County, IndianaIndianapolis992,1963961822Francis Marion
Marion County, IowaKnoxville34,1925551845Francis Marion
Marion County, KansasMarion11,6349441855Francis Marion
Marion County, KentuckyLebanon20,1153441834Francis Marion
Marion County, MississippiColumbia24,0015421811Francis Marion
Marion County, MissouriPalmyra28,5254371826Francis Marion
Marion County, OhioMarion65,1154041820Francis Marion
Marion County, OregonSalem355,7771,1811843Francis Marion
Marion County, South CarolinaMarion28,2424891800Francis Marion
Marion County, TennesseeJasper29,8044981817Francis Marion
Marion County, TexasJefferson9,8963811860Francis Marion
Marion County, West VirginiaFairmont55,5843091842Francis Marion

Questions about Marion Counties

How many Marion Counties are there?

There are 17 Marion Counties in the United States, in Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Mississippi, Missouri, Ohio, Oregon, South Carolina, Tennessee, Texas and West Virginia.

Which Marion County is the largest?

By population, Marion County, Indiana (992,196 people in 2025). By land area, Marion County, Florida (1,588 sq mi).

Which Marion County is the oldest?

Marion County, South Carolina, established in 1800. The newest is Marion County, Texas (1860).

Why are there so many Marion Counties?

17 of the 17 are named after Francis Marion, American politician, Continental Army officer (1732-1795). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Marion 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