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McLean County, Illinois Genealogy project is a free genealogical site about the people and history of this county. We hope you find helpful clues for your research of ancestors and relatives of McLean county.

The first white settlers in what became McLean County arrived around 1821. The first settlement was Blooming Grove, established in 1822 near present-day Bloomington. McLean County was formed on December 25, 1830, out of Tazewell County. It was named for John McLean, United States Senator for Illinois, who died in 1830.

McLean County is the largest county by land area in the state of Illinois with a total of 1,186 square miles of which 1,183 square miles is land and 2.9 square miles is water. According to the 2020 Census, it had a population of 170,954. Its county seat is Bloomington.

Thanks to the many years Carol Genung was County Coordiantor for McLean County.

This county is adoptable.
See this webpage for more information if you are interested.

Contact: ILGenWeb State Coordinator

Please consider contributing your pieces of McLean county family history. YOUR HELP IS NEEDED. Our combined efforts can make this a great site for all who visit!

Corrections, updates, and additions to this site are always welcome. Web sites go away and website addresses change. Please contact me. if you find a broken link on McLean county web pages.

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This McLean County site is part of the ILGenWeb and The USGenWeb Project; which are dedicated to providing free genealogy access online. This site is maintained by a volunteer County Coordinator/ Webmaster.