Illinois Counties
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Illinois Counties

There are one hundred and two counties in Illinois. St. Clair County was the first county established in what is today Illinois. Most counties in Illinois were named after early American leaders, especially of the American Revolutionary War, as well as soldiers from the Battle of Tippecanoe and the War of 1812.

Peoria County, Illinois

Peoria County Education, Geography, and HistoryPeoria County, Illinois Courthouse

Peoria County is a county located in the state of Illinois. According to the 2010 census, it had a population of 186,494. Peoria County was created on January 13, 1825. The county seat is Peoria. The county is named for the Peoria Native American tribe.

Peoria County is part of the Peoria, IL Metropolitan Statistical Area.

Etymology - Origin of Peoria County Name

 The county is named for the Peoria Native American tribe.   


County QuickFacts: CensusBureau Quick Facts

Peoria County History

Peoria County was created on January 13, 1825 (Laws, 1825, p. 85) and was formed from unorganized land and Fulton County. Present area), or parts of it), formerly included in: Fulton County (1823-1825), Pike County (1821-1823), Bond County (1817-1821), Madison County (1812-1821) and St. Clair County (1801-1812).

The County was named for the Indian tribe called the Peorias, one of the tribes from the Illinois confederacy. The County Seat is Peoria (1825-Present).

Geography: Land and Water

As reported by the Census Bureau, the county has a total area of 631 square miles (1,634 km2), of which, 620 square miles (1,605 km2) of it is land and 11 square miles (29 km2) of it (1.80%) is water.

 Peoria county is located close to the center of Illinois. Hazel & Bill Rutherford Wildlife Prairie State Park and Jubilee College State Park are located in this county.

Neighboring Counties

Bordering counties are as follows:

  • North: Stark County
  • Northeast: Marshall County
  • East: Woodford County
  • Southeast: Tazewell County
  • Southwest: Fulton County
  • Northwest: Knox County


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