Places beginning with CO in Ohio, United States
- Coalburg
- Coalgate
- Coal Grove
- Coal Hill
- Coalport
- Coal Ridge
- Coal Run
- Coalton
- Coal, Township of
- Coal, Township of
- Coats
- Cockrell Run
- Coddingville
- Coits
- Coitsville Center
- Coitsville, Township of
- Cokesbury Corners
- Colby
- Cold Springs
- Coldwater
- Coldwater Beach
- Cole
- Colebrook
- Colebrook, Township of
- Coleman
- Colerain
- Colerain Heights
- Colerain, Township of
- Colerain, Township of
- Colerain, Township of
- Coles Park
- Coletown
- Colfax
- Collamer
- College Corner
- College Hill
- College Hill
- College Hill
- College, Township of
- Collins
- Collinsville
- Collinwood
- Colonial Acres (subdivision)
- Colonial Heights
- Colton
- Columbia
- Columbia
- Columbia
- Columbia
- Columbia Center
- Columbia Center
- Columbia Heights (subdivision)
- Columbia Hills Corners
- Columbiana
- Columbiana County
- Columbia Station
- Columbia, Township of
- Columbia, Township of
- Columbia, Township of
- Columbus
- Columbus, City of
- Columbus Grove
- Columbus Park (subdivision)
- Comargo
- Comet
- Comet
- Commercial Point
- Compton Park
- Compton Woods
- Conant
- Concord
- Concord
- Concord
- Concord
- Concord Mobile Home Park (subdivision)
- Concord, Township of
- Concord, Township of
- Concord, Township of
- Concord, Township of
- Concord, Township of
- Concord, Township of
- Concord, Township of
- Condeville
- Condit
- Conesville
- Confederate Crossroads (historical)
- Congo
- Congress
- Congress Lake (historical)
- Congress, Township of
- Congress, Township of
- Conneaut
- Conneaut, City of
- Connett
- Connor
- Connorville
- Conotton
- Conover
- Consol (historical)
- Constitution
- Continental
- Contreras
- Converse
- Converse Station
- Convoy
- Conway Addition
- Cook
- Cook Subdivision
- Coolville
- Coon Crossing
- Cooney
- Coonville
- Coonville
- Cooper
- Cooperdale
- Coopersville
- Copley
- Copley Junction
- Copley, Township of
- Cora
- Cordelia
- Corinth
- Cork
- Cornelion
- Cornell Heights
- Corner
- Cornersburg
- Cornerville
- Corning
- Cornstalk
- Corryville
- Corryville
- Cortland
- Cortsville
- Corvin (historical)
- Corwin
- Coryville
- Coshocton
- Coshocton, City of
- Coshocton County
- Cosmos
- Costonia
- Cotillion Village
- Cottage Grove
- Cottage Hill
- Coulter
- Country Club Acres
- Country Haven Mobile Home Park
- Country Manor Estates
- Country Meadows
- County Line
- County Line (historical)
- Courtright (historical)
- Cove Cottage Area
- Covedale
- Coventry Estates (subdivision)
- Coventry, Township of
- Covington
- Cowans (historical)
- Cowlesville
- Cow Run
- Cox (historical)
- Cox Subdivision
- Coys Subdivision
- Cozaddale