ILLINOIS STATE ARCHIVES

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Mason County

Established
January 20, 1841 (Laws, 1841, p. 69)

Origin of the name of the county
Named after Mason County in Kentucky through the influence of emigrants from that county.

Present area, or parts of it, formerly included in
1827–1841 — Tazewell
1825–1827 — Peoria
1821–1839 — Sangamon
1839–1841 — Menard
1812–1821 — Madison
1790–1812 — St. Clair

County Seats
1841–1843 — Havana
1843–1851 — Bath
1851–  — Havana

History of county governing board
1841–1849 — County Commissioners’ Court
1849–1862 — County Court
1862–  — County Board of Supervisors

Township Government
Adopted — November 5, 1861

Township Names
Allens Grove
Bath
Crane Creek
Forest City — Name changed from Mason Plains (date unknown, before 1921).
Havana
Kilbourne — Formed from Bath (date unknown, before 1921).
Lynchburg
Manito
Mason City
Pennsylvania
Quiver
Salt Creek
Sherman — Formed from Havana, Pennsylvannia and Mason Plains (Forest City) on January 27, 1867.

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