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There are 102 Counties in the state of Illinois.

Piatt County, Illinois

Piatt County History, Geography, and Demographics

County Seat: Monticello
Year Organized: 1841
Square Miles: 440
Court House:

101 West Washington Street
County Courthouse
Monticello, IL 61856-1672

Etymology - Origin of County Name

James A. Piatt, Sr., settled in that area in 1829.


County QuickFacts: Census Bureau Quick Facts

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).


According to the U.S. Census Bureau, the county has a total area of 440 square miles (1,140 kmē), of which, 440 square miles (1,140 kmē) of it is land and 0 square miles (1 kmē) of it (0.07%) is water.

Neighboring Counties:

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

Cities and Towns:

- Bement village Incorporated Area
- Blue Ridge township
- Cerro Gordo village Incorporated Area
- Cisco village Incorporated Area
- De Land village Incorporated Area
- Goose Creek township
- Hammond village Incorporated Area
- Mansfield village Incorporated Area
- Monticello (County Seat) city Incorporated Area
- Sangamon township
- Willow Branch township

County Resources:

Enter County Resources and Information Here

County Resources
Counties: US Map
The history of our nation was a prolonged struggle to define the relative roles and powers of our governments: federal, state, and local. And the names given the counties, our most locally based jurisdictions, reflects the "characteristic features of this country!"