ILLINOIS STATE ARCHIVES
LaSalle County Governmental Center
707 Etna Rd.
Ottawa, IL 61350
815-434-8202 — County Clerk
815-434-8226 — Recorder
LaSalle County Courthouse
Madison & Columbus St.
Ottawa, Illinois 61350
Regional History Center
Founders Memorial Library
Northern Illinois University
DeKalb, IL 60115
January 15, 1831 (Laws, 1831, p. 54)
Origin of the name of the county
Named for Robert de LaSalle, the French explorer who effected the first white settlements in Illinois and explored the Mississippi to the Gulf.
Present area, or parts of it, formerly included in
North of Illinois River
1825–1831 — Putnam
1823–1825 — Fulton
1821–1823 — Pike
South of Illinois River
1827–1831 — Tazewell
1821–1827 — Fayette
1819–1821 — Clark
1816–1819 — Crawford
1815–1816 — Edwards
1812–1815 — Madison
1801–1812 — St. Clair
1790–180 — Knox, Northwest Territory
1831– — Ottawa
History of county governing board
1831–1850 — County Commissioners’ Court
1850– — County Board of Supervisors
Adopted — November 6, 1849
Allen — Formed from Bruce (date unknown).
Fall River — Formed from Grand Rapids (date unknown).
Groveland — Formed from Eagle (date unknown; before September, 1856).
LaSalle — Formed from Peru (date unknown).
Mendota — Formed from Meriden in February, 1856.
Miller — Formed from Manlius and Mission (date unknown).
Ophir — Name changed from Fremont in May, 1850.
Osage — Formed from Eagle (date unknown, before September, 1856).
Otter Creek — Formed from Bruce (date unknown).
Peru — Name changed from Salisbury September 27, 1856.
Richland — Formed from Bruce (date unknown).
Rutland — Name changed from Trenton in May, 1850.
Serena — Name changed from Warren in May, 1850
Wallace — Formed from Dayton (date unknown).
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