Where is Madison County?

19 Madison Counties in 19 states · 1.5 million people (2025)

There are 19 counties named Madison County in the United States, in Alabama, Arkansas, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kentucky, Mississippi, Missouri, Montana, Nebraska, New York, North Carolina, Ohio, Tennessee, Texas and Virginia. The most populous is Madison County, Alabama (county seat: Huntsville), with 433,516 people in 2025. 19 of them are named after James Madison, President of the United States from 1809 to 1817 (1751–1836).

Map of the United States showing where all 19 Madison Counties are, labeled by state
Every Madison 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 19 Madison Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Madison County, AlabamaHuntsville433,5168021808James Madison
Madison County, ArkansasHuntsville18,4108341836James Madison
Madison County, FloridaMadison18,7596971827James Madison
Madison County, GeorgiaDanielsville32,9192821811James Madison
Madison County, IdahoRexburg55,1724691913James Madison
Madison County, IllinoisEdwardsville263,1107161812James Madison
Madison County, IndianaAnderson135,0884521823James Madison
Madison County, IowaWinterset17,2705611846James Madison
Madison County, KentuckyRichmond101,6964381785James Madison
Madison County, MississippiCanton116,2987141828James Madison
Madison County, MissouriFredericktown12,8584941818James Madison
Madison County, MontanaVirginia City10,0263,5881865James Madison
Madison County, NebraskaMadison36,1065731856James Madison
Madison County, New YorkWampsville67,1206551806James Madison
Madison County, North CarolinaMarshall22,5534501851James Madison
Madison County, OhioLondon46,9854671810James Madison
Madison County, TennesseeJackson100,7905571821James Madison
Madison County, TexasMadisonville14,2264661853James Madison
Madison County, VirginiaMadison14,2373211793James Madison

Questions about Madison Counties

How many Madison Counties are there?

There are 19 Madison Counties in the United States, in Alabama, Arkansas, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kentucky, Mississippi, Missouri, Montana, Nebraska, New York, North Carolina, Ohio, Tennessee, Texas and Virginia.

Which Madison County is the largest?

By population, Madison County, Alabama (433,516 people in 2025). By land area, Madison County, Montana (3,588 sq mi).

Which Madison County is the oldest?

Madison County, Kentucky, established in 1785. The newest is Madison County, Idaho (1913).

Why are there so many Madison Counties?

19 of the 19 are named after James Madison, President of the United States from 1809 to 1817 (1751–1836). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Madison 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