- California (Population: 5,274)
- Calumet-Norvelt (Population: 1,682)
- Cambridge Springs (Population: 2,363)
- Camp Hill (Population: 7,636)
- Campbelltown (Population: 2,415)
- Canonsburg (Population: 8,607)
- Canton (Population: 1,807)
- Carbondale (Population: 9,804)
- Carlisle (Population: 17,970)
- Carnegie (Population: 8,389)
- Carnot-Moon (Population: 10,637)
- Carroll Valley (Population: 3,291)
- Carrolltown (Population: 1,049)
- Castanea (Population: 1,189)
- Castle Shannon (Population: 8,556)
- Catasauqua (Population: 6,588)
- Catawissa (Population: 1,589)
- Cecil-Bishop (Population: 2,585)
- Centerville (Population: 3,390)
- Central City (Population: 1,258)
- Centre Hall (Population: 1,079)
- Chalfont (Population: 3,900)
- Chambersburg (Population: 17,862)
- Charleroi (Population: 4,871)
- Chester Heights (Population: 2,481)
- Chester (Population: 36,854)
- Chester Township (Population: 4,604)
- Chesterbrook (Population: 4,625)
- Cheswick (Population: 1,899)
- Chevy Chase Heights (Population: 1,511)
- Chicora (Population: 1,021)
- Christiana (Population: 1,124)
- Churchill (Population: 3,566)
- Churchville (Population: 4,469)
- Clairton (Population: 8,491)
- Clarion (Population: 6,185)
- Clarks Green (Population: 1,630)
- Clarks Summit (Population: 5,126)
- Claysburg (Population: 1,503)
- Clearfield (Population: 6,631)
- Cleona (Population: 2,148)
- Clifton Heights (Population: 6,779)
- Clymer (Population: 1,547)
- Coaldale (Population: 2,295)
- Coatesville (Population: 10,838)
- Cochranton (Population: 1,148)
- Collegeville (Population: 8,032)
- Collingdale (Population: 8,664)
- Colonial Park (Population: 13,259)
- Columbia (Population: 10,311)
- Colver (Population: 1,035)
- Colwyn (Population: 2,453)
- Conneaut Lakeshore (Population: 2,502)
- Connellsville (Population: 9,146)
- Conshohocken (Population: 7,589)
- Conway (Population: 2,290)
- Conyngham (Population: 1,958)
- Coopersburg (Population: 2,582)
- Coplay (Population: 3,387)
- Coraopolis (Population: 6,131)
- Cornwall (Population: 3,486)
- Cornwells Heights-Eddington (Population: 3,406)
- Corry (Population: 6,834)
- Coudersport (Population: 2,650)
- Crafton (Population: 6,706)
- Cresson (Population: 1,631)
- Cressona (Population: 1,635)
- Croydon (Population: 9,993)
- Curtisville (Population: 1,173)
- Curwensville (Population: 2,650)
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