Piatt County is a county located in the state of Illinois. According to the 2010 census, it had a population of 16,729. Its county
seat is Monticello.
Piatt County is part of the Champaign–Urbana, IL Metropolitan Statistical Area.
James A. Piatt, Sr., settled in that area in 1829.
County QuickFacts: Census Bureau Quick Facts
Piatt County was created on January 27, 1841 (Laws, 1841, p. 71) and was formed from DeWitt and Macon Counties.
Present area, or parts of it, formerly included in: DeWitt County (1839–1841), Macon County (1831–1841), McLean County
(1831–1839), Shelby County (1827–1831), Fayette County (1821–1827), Clark County (1819–1821), Crawford County
(1816–1819), Edwards County (1815–1816), Madison County (1812–1815), St. Clair County (1801–1812) and Knox, Northwest
The County was named for James A. Piatt, Sr., who settled in area of the present county in 1829, coming from Indiana. The County Seat is Monticello (Temporary designation 1841-1842; Permanent designation 1842-Present).
According to the US Census Bureau, the county has a total area of 440 square miles (1,140 km2), of which, 440
square miles (1,140 km2) of it is land and 0 square miles (1 km2) of it (0.07%) is water.
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