ILLINOIS STATE ARCHIVES
301 N. Main St.
Mt. Carroll, IL 61053
815-244-0221 — County Clerk
815-244-0230 — Circuit Clerk
815-244-0223 — Recorder
Regional History Center
Founders Memorial Library
Northern Illinois University
DeKalb, IL 60115
- February 22, 1839 (Laws, 1839, p. 160)
Origin of the name of the county
- Named for Charles Carroll of Carrollton, Illinois, a statesman of the American Revolutionary period, signer of the Declaration of Independence, and United States Senator from Maryland.
Present area, or parts of it, formerly included in
- 1827–1839 — JoDaviess
- 1825–1827 — Putnam
- 1825–1827 — Henry
- 1823–1825 — Fulton
- 1821–1823 — Pike
- 1812–1821 — Madison
- 1795–1812 — St. Clair
- 1839–1843 — Savanna
- 1843–present — Mt. Carroll
History of county governing board
- 1839–1850 — County Commissioners’ Court
- 1850–present — County Board of Supervisors
- Adopted — November 6, 1849
- Cherry Grove — Originally included the area of Shannon (first designated Lost Grove) as a temporary attachment.
- Elkhorn Grove
- Fairhaven — Formed from territories originally attached to Harlem (York) and Wysox (date unknown).
- Lima — Originally included the east half of Rock Creek as a temporary attachment.
- Mt. Carroll
- Rock Creek — The west half of township was originally attached temporarily to Rosehall (Salem) and the east half to Lima (date of uniting two halves unknown).
- Salem — Name changed from Rosehall (date unknown); originally included west half of Rock Creek as a temporary attachment.
- Savanna — Originally included as temporary attachments an area called Rush Creek (eastern part of Washington) and an area called Portsmouth (western part of Washington).
- Shannon — Formed from territory originally designated Lost Grove and attached temporarily to Cherry Grove (date unknown).
- Washington — Created from territories originally designated Portsmouth (western part) and Rush Creek (eastern part) and attached temporarily to Savanna (date unknown).
- Wysox — Originally included southeast part of Fairhaven as a temporary attachment.
- York — Name changed from Harlem (date unknown); originally included much of Fairhaven as a temporary attachment; western part, originally designated Bluffville, was also included as a temporary attachment that later became permanent.