ILLINOIS STATE ARCHIVES

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Piatt County

Established
January 27, 1841 (Laws, 1841, p. 71)

Origin of the name of the county
Named for James A. Piatt, Sr., who settled in area of the present county in 1829, coming from Indiana.

Present area, or parts of it, formerly included in
1839–1841 — DeWitt
1831–1841 — Macon
1831–1839 — McLean
1827–1831 — Shelby
1821–1827 — Fayette
1819–1821 — Clark
1816–1819 — Crawford
1815–1816 — Edwards
1812–1815 — Madison
1801–1812 — St. Clair
1790–1801 — Knox, Northwest Territory

County Seats
1841–1842 — Monticello—Temporary designation.
1842–  — Monticello—Permanent designation.

History of county governing board
1841–1849 — County Commissioners’ Court
1849–1860 — County Court
1860–   — County Board of Supervisors

Township Government
Adopted — November 8, 1859

Township Names
Bement
Blue Ridge
Cerro Gordo
Goose Creek
Monticello
Sangamon
Unity — Name changed from Douglas (date unknown, probably 1860).
Willow Branch — Name changed from Liberty (date unknown, probably 1860).

Township Map

Pertinent Databases
Federal Township Plats of Illinois
Illinois Public Domain Land Tract Sales Database
Illinois Statewide Death Index, 1916–1950
Illinois Statewide Marriage Index
Local Governmental Records Database
Name Index to Illinois Local Governments