The following counties in Illinois have historic locations on the National Register of Historic places. Please select a county in Illinois to see the different historic places in the county.

Adams County Historic Locations	Alexander County Historic Locations
Bond County Historic Locations	Boone County Historic Locations
Brown County Historic Locations	Bureau County Historic Locations
Calhoun County Historic Locations	Carroll County Historic Locations
Cass County Historic Locations	Champaign County Historic Locations
Christian County Historic Locations	Clark County Historic Locations
Clay County Historic Locations	Clinton County Historic Locations
Coles County Historic Locations	Cook County Historic Locations
Crawford County Historic Locations	Cumberland County Historic Locations
De Kalb County Historic Locations	De Witt County Historic Locations
Douglas County Historic Locations	Du Page County Historic Locations
Edgar County Historic Locations	Effingham County Historic Locations
Fayette County Historic Locations	Ford County Historic Locations
Franklin County Historic Locations	Fulton County Historic Locations
Gallatin County Historic Locations	Greene County Historic Locations
Grundy County Historic Locations	Hamilton County Historic Locations
Hancock County Historic Locations	Hardin County Historic Locations
Henderson County Historic Locations	Henry County Historic Locations
Iroquois County Historic Locations	Jackson County Historic Locations
Jasper County Historic Locations	Jefferson County Historic Locations
Jersey County Historic Locations	Jo Daviess County Historic Locations
Johnson County Historic Locations	Kane County Historic Locations
Kankakee County Historic Locations	Kendall County Historic Locations
Knox County Historic Locations	Lake County Historic Locations
La Salle County Historic Locations	Lee County Historic Locations
Livingston County Historic Locations	Logan County Historic Locations
Macon County Historic Locations	Macoupin County Historic Locations
Madison County Historic Locations	Marion County Historic Locations
Marshall County Historic Locations	Mason County Historic Locations
Massac County Historic Locations	McDonough County Historic Locations
McHenry County Historic Locations	McLean County Historic Locations
Menard County Historic Locations	Mercer County Historic Locations
Monroe County Historic Locations	Montgomery County Historic Locations
Morgan County Historic Locations	Moultrie County Historic Locations
Ogle County Historic Locations	Peoria County Historic Locations
Perry County Historic Locations	Piatt County Historic Locations
Pike County Historic Locations	Pope County Historic Locations
Pulaski County Historic Locations	Putnam County Historic Locations
Randolph County Historic Locations	Richland County Historic Locations
Rock Island County Historic Locations	Saline County Historic Locations
Sangamon County Historic Locations	Schuyler County Historic Locations
Scott County Historic Locations	Shelby County Historic Locations
Stark County Historic Locations	St. Clair County Historic Locations
Stephenson County Historic Locations	St. Louis County Historic Locations
Tazewell County Historic Locations	Union County Historic Locations
Vermilion County Historic Locations	Wabash County Historic Locations
Warren County Historic Locations	Washington County Historic Locations
Wayne County Historic Locations	White County Historic Locations
Whiteside County Historic Locations	Will County Historic Locations
Williamson County Historic Locations	Winnebago County Historic Locations
Woodford County Historic Locations