- Cabin John (Population: 1,734)
- California (Population: 9,307)
- Calvert Beach-Long Beach (Population: 2,487)
- Calverton (Population: 12,610)
- Cambridge (Population: 10,911)
- Camp Springs (Population: 17,968)
- Cape St. Claire (Population: 8,022)
- Capitol Heights (Population: 4,138)
- Carmody Hills-Pepper Mill Village (Population: 4,801)
- Carney (Population: 28,264)
- Catonsville (Population: 39,820)
- Cavetown (Population: 1,486)
- Centreville (Population: 1,970)
- Charlestown (Population: 1,019)
- Charlotte Hall (Population: 1,214)
- Chesapeake Beach (Population: 3,180)
- Chesapeake Ranch Estates-Drum Point (Population: 11,503)
- Chester (Population: 3,723)
- Chestertown (Population: 4,746)
- Cheverly (Population: 6,433)
- Chevy Chase (Population: 2,726)
- Chevy Chase Village (Population: 2,043)
- Chillum (Population: 34,252)
- Clarksburg (Population: 1,834)
- Clinton (Population: 26,064)
- Clover Hill (Population: 3,260)
- Cloverly (Population: 7,835)
- Cockeysville (Population: 19,388)
- Colesville (Population: 19,810)
- College Park (Population: 24,657)
- Colmar Manor (Population: 1,257)
- Columbia (Population: 88,254)
- Coral Hills (Population: 10,720)
- Cottage City (Population: 1,136)
- Cresaptown-Bel Air (Population: 5,884)
- Crisfield (Population: 2,723)
- Crofton (Population: 20,091)
- Crownsville (Population: 1,670)
- Cumberland (Population: 21,518)
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