What county is peoria illinois in?

Peoria (/ p i ˈ ɔːr i ə / pee-OR-ee-ə) is the county seat of Peoria County, Illinois, and the largest city on the Illinois River. Established in 1691 by the French explorer Henri de Tonti, Peoria is the oldest European settlement in Illinois, and is named after the Peoria tribe. read more

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. In 1830, Warren County organized a government. read more

The Peoria County Board for the Care and Treatment of Persons with a Developmental Disability (Care and Treatment Board) is pleased to announce a record $900,000 award to five local agencies for the 2018-2019 service year. read more