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Peoria County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 186,494.〔(【引用サイトリンク】url=http://quickfacts.census.gov/qfd/states/17/17143.html )〕 Its county seat is Peoria.〔(【引用サイトリンク】accessdate=2011-06-07 )〕 Peoria County is part of the Peoria, IL Metropolitan Statistical Area. ==History== 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. File:Peoria County Illinois 1825.png|Peoria County for the first year after its creation, including a large tract of unorganized territory temporarily attached to it.〔White, Jesse. ''Origin and Evolution of Illinois Counties.'' State of Illinois, March 2010. ()〕 File:Peoria County Illinois 1826.png|Peoria County between 1826 and 1827. The newly created Mercer and Warren Counties were temporarily attached to Peoria until county governments could be organized.〔 File:Peoria County Illinois 1827.png|Peoria County between 1827 and 1830. The creation of Tazewell County left Peoria with only a small tract of unorganized territory east of the Illinois River, whose border was not defined. File:Peoria County Illinois 1830.png|In 1830, Warren County organized a government. File:Peoria County Illinois 1831.png|In 1831, Peoria County's present borders were established and Mercer County was attached to Warren. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Peoria County, Illinois」の詳細全文を読む スポンサード リンク
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