|Named for||Peoria tribe|
|• Total||631 sq mi (1,630 km2)|
|• Land||619 sq mi (1,600 km2)|
|• Water||11 sq mi (30 km2) 1.8%|
| • Estimate |
|• Density||300/sq mi (110/km2)|
|Time zone||UTC−6 (Central)|
|• Summer (DST)||UTC−5 (CDT)|
|Congressional districts||17th, 18th|
Peoria County is located in the U.S. state of Illinois. The 2010 United States Census listed its population at 186,494. Its county seat is Peoria. Peoria County is part of the Peoria, IL Metropolitan Statistical Area.
Peoria County was formed in 1825 out of Fulton County. It was named for the Peoria, an Illiniwek people who lived there. It included most of the western valley of the Illinois River up to the Chicago river portage.
According to the US Census Bureau, the county has a total area of 631 square miles (1,630 km2), of which 619 square miles (1,600 km2) is land and 11 square miles (28 km2) (1.8%) is water. The county is drained by Spoon River, Kickapoo Creek, Elbow Creek, and Copperas Creek.
|Climate chart (explanation)|
In recent years, average temperatures in the county seat of Peoria have ranged from a low of 14 °F (−10 °C) in January to a high of 86 °F (30 °C) in July, although a record low of −27 °F (−33 °C) was recorded in January 1884 and a record high of 113 °F (45 °C) was recorded in July 1936. Average monthly precipitation ranged from 1.50 inches (38 mm) in January to 4.17 inches (106 mm) in May.
|US Decennial Census|
As of the 2010 United States Census, there were 186,494 people, 75,793 households, and 47,248 families residing in the county. The population density was 301.2 inhabitants per square mile (116.3/km2). There were 83,034 housing units at an average density of 134.1 per square mile (51.8/km2). The racial makeup of the county was 74.4% white, 17.7% black or African American, 3.1% Asian, 0.3% American Indian, 1.6% from other races, and 2.8% from two or more races. Those of Hispanic or Latino origin made up 3.8% of the population. In terms of ancestry, 28.3% were German, 14.8% were Irish, 10.4% were English, and 5.5% were American.
Of the 75,793 households, 30.5% had children under the age of 18 living with them, 44.1% were married couples living together, 14.1% had a female householder with no husband present, 37.7% were non-families, and 31.0% of all households were made up of individuals. The average household size was 2.39 and the average family size was 3.00. The median age was 36.8 years.
The median income for a household in the county was $49,747 and the median income for a family was $63,163. Males had a median income of $51,246 versus $32,881 for females. The per capita income for the county was $28,157. About 10.3% of families and 14.5% of the population were below the poverty line, including 21.8% of those under age 18 and 7.8% of those age 65 or over.
See also: Peoria, Illinois § Points of interest
Further information: List of school districts in Illinois § Peoria County
See also: List of people from Peoria, Illinois
People from Peoria County other than in the city of Peoria:
Peoria County is governed by an 18-member County Board which meets on the second Thursday of each month. Each member represents a district with roughly 10,000 residents.
|District||Board Member||Residence||In office since||Party|
|1||Sharon K. Williams||Peoria||2012||Democratic|
|4||Andrew Rand (Chair)||Peoria||2008||Democratic|
|6||Dr. Eden Blair||Peoria||2019||Democratic|
|7||James C. Dillon||West Peoria||2006||Democratic|
|9||Kate Pastucha||Peoria Heights||2017||Democratic|
|11||Linda E. Daley||Peoria||2019||Republican|
|13||James Fennell (Vice-Chair)||Chillicothe||2010||Republican|
|15||Steven B. Rieker||Peoria||2016||Republican|
|17||Jennifer Groves Allison||Peoria||2019||Democratic|
The County also elects an Auditor, Circuit Clerk, Coroner, County Clerk, Sheriff, State's Attorney, Regional Superintendent, and Treasurer to four-year terms.
|Office||Current Holder||In office since||Party|
|Circuit Clerk||Bobby Spears||2002||Democratic|
|County Clerk||Rachael Parker||2019||Democratic|
|State's Attorney||Jodi Hoos||2019||Democratic|
|Regional Superintendent||Elizabeth Crider||2014||Democratic|
Prior to 1992, Peoria County usually voted for Republican candidates in presidential elections, only voting for Democratic Party candidates when they won nationally by a landslide. It began trending away from the GOP in the mid-1980s, as evidenced when Ronald Reagan only carried it with 55 percent of the vote in 1984 even as he was winning reelection in a landslide nationally.
From 1992 onward, the county has backed the Democratic candidate in every presidential election, though never by a margin greater than 10 percent aside from 2008 when Illinoisan Barack Obama won it by nearly 14 points. This relative closeness in results was most evident in 2004 when the county backed John Kerry over George W. Bush by only 70 votes.
In Congress, Peoria County is represented by Democrat Cheri Bustos of Illinois's 17th congressional district and Republican Darin LaHood of the Illinois's 18th congressional district
In the Illinois Senate, Peoria County is represented by Republican Chuck Weaver of the 37th Legislative District and Democrat Dave Koehler of the 46th Legislative District. In the Illinois House of Representatives, Peoria County is represented by Republican Ryan Spain of the 73rd Representative District, Republican Mike Unes of the 91st Representative District and Democrat Jehan Gordon-Booth of the 92nd Representative District.