Cities and Communities in Southern Ontario
(check also Northern Ontario)
| Cache Bay | Castleford | Clarence-Rockland | Coppin's Corners |
| Caesarea | Castleton | Clarence Creek | Corbeil |
| Cainsville | Cataraqui | Clarendon Station | Corbett |
| Cairngorm | Catchacoma | Clarington | Corbetton |
| Cairo | Cathcart | Clarke's Corners | Corbyville |
| Caistor Centre | Cavan | Clarksburg | Cordova Mines |
| Caistorville | Caverlys Landing | Clarkson | Corinth |
| Calabogie | Cawaja Beach | Clavering | Cormac |
| Caledon | Cayuga | Clayton | Cornwall |
| Caledon East | Cecebe | Clear Creek | Cornwall Island |
| Caledonia | Cedar Beach (Essex) | Clear Lake (Muskoka) | Corunna |
| Callander | Cedar Beach (Renfrew) | Clear Lake (Parry Sound) | Cotswold |
| Callum | Cedar Mills | Clifford | Cottam |
| Calton | Cedar Point | Clinton | Coulson |
| Camborne | Cedar Springs | Cloyne | Courtice |
| Cambray | Cedar Valley | Clyde | Courtland |
| Cambridge | Cedarhurst Park | Coatsworth | Courtright |
| Camden East | Central Elgin | Cobden | Coxvale |
| Cameron | Centralia | Coboconk | Craighurst |
| Camilla | Centre Dummer | Cobourg | Craigleith |
| Camlachie | Cenreton | Codes Corner | Cranbrook |
| Campbellcroft | Centreville (Lennox & Addington) | Codrington | Crediton |
| Campbellford | Centreville (Oxford) | Coe Hill | Creditville |
| Campbellford/Seymour | Ceylon | Colborne | Creemore |
| Campbellvale | Chaffeys Locks | Colchester | Creighton |
| Campbellville | Chalk River | Colchester-Essex-Harrow | Creighton Heights |
| Campden | Chambers Corners | Cold Springs | Crewsons Corners |
| Canborough | Champlain Park | Coldstream | Crieff |
| Canfield | Chantry | Coldwater | Cromarty |
| Cannifton | Charing Cross | Colebrook | Crooked Bay |
| Cannington | Charleston | Colgan | Crookston |
| Cape Croker | Chatham | Collingwood | Crosby |
| Cape Hurd | Chatham-Kent | Collins Bay | Crosshill |
| Cardiff | Chatsworth | Columbus | Croton |
| Cardinal | Cheapside | Colwell | Crow Lake |
| Cargill | Cheltenham | Comber | Crowes Landing |
| Carleton Place | Chenaux | Combermere | Crown Hill |
| Carling | Cheney | Comet | Cruikshank |
| Carlingford | Chepstow | Commanda | Crumlin |
| Carlisle (Hamilton-Wentworth) | Cherry Valley | Conestogo | Crysler |
| Carlisle (Middlesex) | Chesley | Coniston | Crystal Beach |
| Carlow | Chesterville | Conn | Crystal Falls |
| Carlsbad Springs | Chippawa | Connor | Crystal Srpings |
| Carlsruhe | Chippawa Hill | Consecon | Culloden |
| Carluke | Chiswick | Constance Bay | Cultus |
| Carnarvon | Christian Island | Conway | Cumberland |
| Carp | Churchill | Cooks Mills | Cumberland Beach |
| Carrying Place | Clandeboye | Cookstown | Curran |
| Carthage | Clappison's Corners | Copenhagen | Curve Lake |
| Casimir | Claremont | Copetown | Cutler |
| Casselman | Clarence | Copper Cliff |