Where is McLean County?

3 McLean Counties in 3 states · 190,223 people (2025)

There are 3 counties named McLean County in the United States, in Illinois, Kentucky and North Dakota. The most populous is McLean County, Illinois (county seat: Bloomington), with 171,419 people in 2025.

Map of the United States showing where all 3 McLean Counties are, labeled by state
Every McLean 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 3 McLean Counties

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

StateCounty seatPopulation 2025Land area (sq mi)EstablishedNamed after
McLean County, IllinoisBloomington171,4191,1831830John McLean
McLean County, KentuckyCalhoun9,0642531854Alney McLean
McLean County, North DakotaWashburn9,7402,1101883–

Questions about McLean Counties

How many McLean Counties are there?

There are 3 McLean Counties in the United States, in Illinois, Kentucky and North Dakota.

Which McLean County is the largest?

By population, McLean County, Illinois (171,419 people in 2025). By land area, McLean County, North Dakota (2,110 sq mi).

Which McLean County is the oldest?

McLean County, Illinois, established in 1830. The newest is McLean County, North Dakota (1883).

How do I find out which McLean 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