Peoria County, Illinois

Peoria County is a county in the U.S. state of Illinois. In the 2020 census, 181,830 people lived there.^[1] The county seat is Peoria. It's one of few to have a flag

Peoria County, Illinois Media

Peoria County at creation, with unorganized territory attached to it.
Peoria County 1826–1827. The newly created Mercer and Warren Counties were temporarily attached to Peoria.
Peoria County 1827–1830. 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.
In 1831, Peoria County's present borders were established and Mercer County was attached to Warren.

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