Adams County, Illinois
Formed in 1825 from Pike County
Bureau County, Illinois
Bureau County was formed in 1837 from Putnam County.
Clark County, Illinois
Clark County was formed in 1819 from Crawford County.
Coles County, Illinois
Coles County was formed in 1830 from Clark and Edgar Counties.
Crawford County, Illinois
Crawford County was formed in 1816 from Edwards County.