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Illinois Counties

There are one hundred and two counties in Illinois. St. Clair County was the first county established in what is today Illinois. Most counties in Illinois were named after early American leaders, especially of the American Revolutionary War, as well as soldiers from the Battle of Tippecanoe and the War of 1812.

Piatt County, Illinois

Piatt County Education, Geography, and HistoryPiatt County, Illinois Courthouse

Piatt County is a county located in the state of Illinois. According to the 2010 census, it had a population of 16,729. Piatt County was created on January 27, 1841. The county seat is Monticello. The county is named for John Piatt, the patriarch of a prominent settler family in the early history of the county.

Piatt County is part of the Champaign-Urbana, IL Metropolitan Statistical Area.

Etymology - Origin of Piatt County Name

The county is named for John Piatt, the patriarch of a prominent settler family in the early history of the county.


County QuickFacts: CensusBureau Quick Facts

Piatt County History

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 Territory (1790-1801).

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).

Geography: Land and Water

As reported by the 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.

 Piatt county is located close to the center of Illinois.

Neighboring Counties

Bordering counties are as follows:

  • Northeast: Champaign County
  • Southeast: Douglas County
  • South: Moultrie County
  • Southwest: Macon County
  • Northwest: DeWitt County; McLean County


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