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Rock Island County, Illinois

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Rock Island County, Illinois
Rock Island County Courthouse - Rock Island, Illinois — CC BY-SA 4.0, Farragutful · source

About Rock Island County

Rock Island County is a county located in the U.S. state of Illinois, bounded on the west by the Mississippi River. According to the 2020 census, it had a population of 144,672. Its county seat is Rock Island; its largest city is neighboring Moline. Rock Island County is one of the four counties that make up the Davenport–Moline–Rock Island, IA–IL Metropolitan Statistical Area.

Description adapted from Wikipedia, CC BY-SA 4.0.

Rock Island County at a glance

County seat
Rock Island
Population
144,672 (2020)
Land area
451 sq mi
Founded
1831

Largest communities in Rock Island County

  1. Moline42,985
  2. Rock Island County seat37,108
  3. South Moline Township36,613
  4. Moline Township22,930
  5. Hampton Township21,709

History of Rock Island County

Rock Island County was formed in 1831 out of Jo Daviess County. It was named for Rock Island, an island in the Mississippi River now known as Arsenal Island. The Rock River (which the Sauk and Meskwaki peoples called Sinnissippi, meaning "rocky waters") flows from Whiteside County and points further east and north and joins the Mississippi River at Rock Island. The Sinnissippi Mounds, dating from the Hopewell period and on the National Register of Historic Places are upriver at Sterling in Whiteside County.

Adapted from Wikipedia, CC BY-SA 4.0.

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  2. 02

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Official channels

Rock Island County election resources

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Neighboring counties

Part of Illinois Voter Check

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