Places beginning with CA in Illinois, United States
- Cabery
- Cable
- Cabrini Addition (subdivision)
- Cache
- Cache Election Precinct
- Cache Election Precinct
- Cache Lake
- Cache, Township of
- Cadiz
- Cadwell
- Cahokia
- Cahokia, Township of
- Cairo
- Cairo Election Precinct
- Cairo Junction
- Caldwell
- Caledonia
- Caledonia (historical)
- Caledonia, Township of
- Calftown (historical)
- Calhoun
- Calhoun County
- California Park (subdivision)
- Calumet
- Calumet City
- Calumet Heights (subdivision)
- Calumet Park
- Calumet, Township of
- Calvin
- Camargo
- Camargo, Township of
- Cambon
- Cambria
- Cambridge
- Cambridge, Township of
- Camden
- Camden
- Camden, Township of
- Cameron
- Camp Algonquin
- Campbell
- Campbell
- Campbell
- Campbell Hill
- Campbellsburg (historical)
- Camp Ground
- Camp Grove
- Camp Logan
- Camp Point
- Camp Point, Township of
- Campton
- Campton Pines
- Campton, Township of
- Camp Travis
- Campus
- Canalport (subdivision)
- Canal Trustees (subdivision)
- Canaryville (subdivision)
- Canoe Creek, Township of
- Canteen, Township of
- Canton
- Canton, Township of
- Cantrall
- Canyon Ridge (subdivision)
- Capital, Township of
- Capitol Oaks
- Capri Village
- Capron
- Carbon
- Carbon Cliff
- Carbondale
- Carbondale, Township of
- Carbon Hill
- Cardiff
- Cardinal Court
- Carle Springs
- Carlin Election Precinct
- Carlinville
- Carlinville, Township of
- Carlock
- Carl Sandburg Village (subdivision)
- Carlsburg
- Carlyle
- Carlyle, Township of
- Carman
- Carman, Township of
- Carmi
- Carmi, Township of
- Carol Stream
- Carpenter
- Carpenters Addition (subdivision)
- Carpentersville
- Carriage Lane Estates
- Carrier Mills
- Carrier Mills, Township of
- Carrigan, Township of
- Carroll County
- Carrollton
- Carrollton, Township of
- Carroll, Township of
- Carson, Township of
- Carterville
- Carthage
- Carthage
- Carthage Lake
- Carthage, Township of
- Cartter
- Cartwright, Township of
- Carville (subdivision)
- Cary
- Cascade
- Casey
- Casey, Township of
- Caseyville
- Caseyville, Township of
- Casner
- Casner, Township of
- Caspars
- Cass County
- Cass (historical)
- Cass, Township of
- Castle Fin
- Castle Junction
- Castleton
- Catfish (historical)
- Catharine
- Catlin
- Catlin, Township of
- Caton Farm
- Cave-in-Rock
- Cave-In-Rock Election Precinct
- Cave, Township of
- Cayuga
- Cazenovia
- Cazenovia, Township of