Where is Monroe County?

17 Monroe Counties in 17 states · 1.6 million people (2025)

There are 17 counties named Monroe County in the United States, in Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kentucky, Michigan, Mississippi, Missouri, New York, Ohio, Pennsylvania, Tennessee, West Virginia and Wisconsin. The most populous is Monroe County, New York (county seat: Rochester), with 750,506 people in 2025. 17 of them are named after James Monroe, president of the United States from 1817 to 1825 (1758–1831).

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

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Monroe County, AlabamaMonroeville18,9651,0261815James Monroe
Monroe County, ArkansasClarendon6,2446081829James Monroe
Monroe County, FloridaKey West80,4069831823James Monroe
Monroe County, GeorgiaForsyth32,0233961821James Monroe
Monroe County, IllinoisWaterloo34,8403851816James Monroe
Monroe County, IndianaBloomington143,3453951818James Monroe
Monroe County, IowaAlbia7,4064341843James Monroe
Monroe County, KentuckyTompkinsville11,1913301820James Monroe
Monroe County, MichiganMonroe156,0045491817James Monroe
Monroe County, MississippiAberdeen33,3187651821James Monroe
Monroe County, MissouriParis8,9596481831James Monroe
Monroe County, New YorkRochester750,5066571821James Monroe
Monroe County, OhioWoodsfield12,9944561813James Monroe
Monroe County, PennsylvaniaStroudsburg167,1796081836James Monroe
Monroe County, TennesseeMadisonville49,7306361819James Monroe
Monroe County, West VirginiaUnion12,4914731799James Monroe
Monroe County, WisconsinSparta46,5729011854James Monroe

Questions about Monroe Counties

How many Monroe Counties are there?

There are 17 Monroe Counties in the United States, in Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Iowa, Kentucky, Michigan, Mississippi, Missouri, New York, Ohio, Pennsylvania, Tennessee, West Virginia and Wisconsin.

Which Monroe County is the largest?

By population, Monroe County, New York (750,506 people in 2025). By land area, Monroe County, Alabama (1,026 sq mi).

Which Monroe County is the oldest?

Monroe County, West Virginia, established in 1799. The newest is Monroe County, Wisconsin (1854).

Why are there so many Monroe Counties?

17 of the 17 are named after James Monroe, president of the United States from 1817 to 1825 (1758–1831). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Monroe 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