Places beginning with CL in Illinois, United States
- Clank
- Clare
- Claremont
- Claremont Cottages (subdivision)
- Claremont, Township of
- Clarence
- Clarendon Hills
- Clarion
- Clarion, Township of
- Clark
- Clark Center
- Clark County
- Clarkdale (subdivision)
- Clarke City
- Clarksburg
- Clarksburg IL
- Clarksburg, Township of
- Clarksdale
- Clarksville
- Clarksville
- Clarmin
- Claus
- Clay City
- Clay City, Township of
- Clay County
- Claypool
- Claypool Woods
- Clays Prairie
- Claysville
- Clayton
- Clayton, Township of
- Clayton, Township of
- Claytonville
- Clearing
- Clearing (subdivision)
- Clear Lake
- Clear Lake
- Clear Lake, Township of
- Cleaverville (subdivision)
- Cleburne
- Clements
- Clement, Township of
- Cleone
- Cleveland
- Cleveland Subdivision (subdivision)
- Cliffdale
- Clifford
- Clifton
- Clifton Terrace
- Clifty Heights
- Clinton
- Clinton County
- Clintonia, Township of
- Clinton, Township of
- Clintonville
- Cloverdale
- Cloverdale
- Clover, Township of
- Clyde (subdivision)
- Clyde, Township of