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Clark County, Illinois

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Clark County, Illinois
Clark County Courthouse in Marshall, southwestern angle — Public domain, Nyttend · source

About Clark County

Clark County is a county located in the southeastern part of the U.S. state of Illinois, along the Indiana state line. As of the 2020 census, the population was 15,455. Its county seat is Marshall. The county was named for George Rogers Clark, an officer who served in the American Revolution.

Description adapted from Wikipedia, CC BY-SA 4.0.

Clark County at a glance

County seat
Marshall
Population
15,455 (2020)
Land area
505 sq mi
Founded
1819

Largest communities in Clark County

  1. Marshall Township4,581
  2. Marshall County seat3,947
  3. Casey Township3,459
  4. Casey2,404
  5. Wabash Township2,081

History of Clark County

Clark County was formed in 1819 out of Crawford County. At the time of its formation, Clark County included about a third of Illinois and extended as far north as the present state of Wisconsin. In 1821, the northern part of Clark County became part of the newly created Pike County on January 31, and the newly created Fayette County took the western part of Clark County on February 14. Edgar County was created from the northern part of Clark County on January 3, 1823. The creation of Coles County occupied additional land from western Clark County, effective December 25, 1830. The boundaries of Clark County have been unchanged since. Clark County was named for George Rogers Clark (older brother of William Clark of the Lewis and Clark Expedition), an officer of the army of Virginia that captured the Northwest Territory from the British during the Revolutionary War.

Adapted from Wikipedia, CC BY-SA 4.0.

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Official channels

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Part of Illinois Voter Check

This is the Clark 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 Clark County or the Illinois State Board of Elections publishes, they are right and this page is not.