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- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
McLean County is the largest county by land area in the U.S. state of Illinois. According to the 2010 census, it had a population of 169,572. Its county seat is Bloomington. McLean County is included in the Bloomington–Normal, IL Metropolitan Statistical Area.
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 late in 1830 out of Tazewell County. It was named for John McLean, United States Senator for Illinois, who died in 1830.
Timeline
| Date | Event | Source
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| 1830 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1831 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1831 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1831 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1831 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1840 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1850 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1877 | Birth records recorded | Source:Red Book: American State, County, and Town Sources
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Population History
- source: Source:Population of States and Counties of the United States: 1790-1990
| Census Year | Population
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| 1840 | 6,565
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| 1850 | 10,163
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| 1860 | 28,772
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| 1870 | 53,988
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| 1880 | 60,100
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| 1890 | 63,036
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| 1900 | 67,843
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| 1910 | 68,008
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| 1920 | 70,107
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| 1930 | 73,117
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| 1940 | 73,930
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| 1950 | 76,577
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| 1960 | 83,877
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| 1970 | 104,389
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| 1980 | 119,149
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| 1990 | 129,180
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Research Tips
Resources
- Outstanding guide to McLean County family history and genealogy resources (FamilySearch Research Wiki). Birth, marriage, and death records, censuses, wills, deeds, county histories, cemeteries, churches, naturalizations, newspapers, libraries, and genealogical societies.
- McLean County, Illinois Government
- McLean County ILGenWeb
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