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Mercer County, Illinois

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Mercer County, Illinois
Mercer County Courthouse Image — CC BY-SA 3.0, Boscophotos · source

About Mercer County

Mercer County is a county in Illinois. According to the 2020 census, it had a population of 15,699. Its county seat is Aledo. Mercer County is included in the Davenport-Moline-Rock Island, IA-IL Metropolitan Statistical Area.

Description adapted from Wikipedia, CC BY-SA 4.0.

Mercer County at a glance

County seat
Aledo
Population
15,699 (2020)
Land area
561 sq mi
Founded
1825

Largest communities in Mercer County

  1. Mercer Township3,964
  2. Aledo County seat3,633
  3. Richland Grove Township2,333
  4. Preemption Township1,687
  5. Greene Township1,431

History of Mercer County

Mercer County is named for Hugh Mercer (1726–1777), a physician and general during the American Revolution who died from wounds suffered at the Battle of Princeton. In May 1812, Congress passed an act which set aside lands in Arkansas, Michigan, and Illinois as payment to volunteer soldiers in the War of 1812. Mercer County was part of this "Military Tract." Seven years after Illinois became a state, Mercer County was founded. It was formed from unorganized territory near Pike County on January 13, 1825. Although the county had been created, its government was not organized for several years; for administration purposes it was attached first to Schuyler County (until 1826), then to Peoria (until 1831), and finally to Warren County. The organization of the county government was finally completed in 1835, after a large influx of settlers following the Black Hawk War.

Adapted from Wikipedia, CC BY-SA 4.0.

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Part of Illinois Voter Check

This is the Mercer County page of Illinois Voter Check, a project of True the Vote, pointing Illinois voters at the official tools that already exist — and at Scan Check Protect to verify your registration.

Where anything here differs from what Mercer County or the Illinois State Board of Elections publishes, they are right and this page is not.