Where is Warren County?

14 Warren Counties in 14 states · 894,993 people (2025)

There are 14 counties named Warren County in the United States, in Georgia, Illinois, Indiana, Iowa, Kentucky, Mississippi, Missouri, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee and Virginia. The most populous is Warren County, Ohio (county seat: Lebanon), with 257,181 people in 2025. 14 of them are named after Joseph Warren, American doctor (1741-1775).

Map of the United States showing where all 14 Warren Counties are, labeled by state
Every Warren 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 14 Warren Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Warren County, GeorgiaWarrenton5,2692841793Joseph Warren
Warren County, IllinoisMonmouth16,2225421825Joseph Warren
Warren County, IndianaWilliamsport8,4743651827Joseph Warren
Warren County, IowaIndianola57,3315701846Joseph Warren
Warren County, KentuckyBowling Green149,3755421796Joseph Warren
Warren County, MississippiVicksburg41,7595891809Joseph Warren
Warren County, MissouriWarrenton39,0164291833Joseph Warren
Warren County, New JerseyBelvidere112,9533571824Joseph Warren
Warren County, New YorkQueensbury65,0208671813Joseph Warren
Warren County, North CarolinaWarrenton18,8984291779Joseph Warren
Warren County, OhioLebanon257,1814011803Joseph Warren
Warren County, PennsylvaniaWarren37,0388841800Joseph Warren
Warren County, TennesseeMcMinnville43,7174331807Joseph Warren
Warren County, VirginiaFront Royal42,7402151836Joseph Warren

Questions about Warren Counties

How many Warren Counties are there?

There are 14 Warren Counties in the United States, in Georgia, Illinois, Indiana, Iowa, Kentucky, Mississippi, Missouri, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee and Virginia.

Which Warren County is the largest?

By population, Warren County, Ohio (257,181 people in 2025). By land area, Warren County, Pennsylvania (884 sq mi).

Which Warren County is the oldest?

Warren County, North Carolina, established in 1779. The newest is Warren County, Iowa (1846).

Why are there so many Warren Counties?

14 of the 14 are named after Joseph Warren, American doctor (1741-1775). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Warren 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