Where is Montgomery County?

18 Montgomery Counties in 18 states · 4.1 million people (2025)

There are 18 counties named Montgomery County in the United States, in Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Mississippi, Missouri, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Texas and Virginia. The most populous is Montgomery County, Maryland (county seat: Rockville), with 1,074,582 people in 2025. 15 of them are named after Richard Montgomery, Irish-born soldier in the British Army, later in the American Continental Army (1738–1775).

Map of the United States showing where all 18 Montgomery Counties are, labeled by state
Every Montgomery 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 18 Montgomery Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
Montgomery County, AlabamaMontgomery225,8917851816Lemuel Purnell Montgomery
Montgomery County, ArkansasMount Ida8,5797811842Richard Montgomery
Montgomery County, GeorgiaMount Vernon8,6352411793Richard Montgomery
Montgomery County, IllinoisHillsboro28,0767041821Richard Montgomery
Montgomery County, IndianaCrawfordsville38,9545051823Richard Montgomery
Montgomery County, IowaRed Oak10,0024241851Richard Montgomery
Montgomery County, KansasIndependence30,1776441867Richard Montgomery
Montgomery County, KentuckyMount Sterling28,8221971796Richard Montgomery
Montgomery County, MarylandRockville1,074,5824931776Richard Montgomery
Montgomery County, MississippiWinona9,3544071871Montgomery County, Richard Montgomery
Montgomery County, MissouriMontgomery City11,5905351818Richard Montgomery
Montgomery County, New YorkFonda50,0464031772Richard Montgomery
Montgomery County, North CarolinaTroy26,4034921779Richard Montgomery
Montgomery County, OhioDayton539,5984611803Richard Montgomery
Montgomery County, PennsylvaniaNorristown877,6434831784Richard Montgomery, Montgomeryshire
Montgomery County, TennesseeClarksville249,9355391796John Montgomery
Montgomery County, TexasConroe781,1941,0421837Montgomery
Montgomery County, VirginiaChristiansburg98,434387–Richard Montgomery

Questions about Montgomery Counties

How many Montgomery Counties are there?

There are 18 Montgomery Counties in the United States, in Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Mississippi, Missouri, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Texas and Virginia.

Which Montgomery County is the largest?

By population, Montgomery County, Maryland (1,074,582 people in 2025). By land area, Montgomery County, Texas (1,042 sq mi).

Which Montgomery County is the oldest?

Montgomery County, New York, established in 1772. The newest is Montgomery County, Mississippi (1871).

Why are there so many Montgomery Counties?

15 of the 18 are named after Richard Montgomery, Irish-born soldier in the British Army, later in the American Continental Army (1738–1775). Many counties took their names from the same founders, presidents and generals as new states were organized.

How do I find out which Montgomery 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