| | | Cambria County | PA | 42021 | | Johnstown, PA 27780 | Johnstown-Somerset, PA 306 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=CambriaCounty+PA |
| | | Cameron County | PA | 42023 | | | | Non-metropolitan | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=CameronCounty+PA |
| | | Carbon County | PA | 42025 | | Allentown-Bethlehem-Easton,
PA-NJ 10900 | New York-Newark,
NY-NJ-CT-PA 408 | Central | metro county (urban) | recreation | https://maps.google.com/?q=CarbonCounty+PA |
| | | Centre County | PA | 42027 | | State College, PA 44300 | State College-DuBois, PA 524 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=CentreCounty+PA |
| | | Chester County | PA | 42029 | Montgomery County-Bucks
County-Chester County, PA 33874 | Philadelphia-Camden-Wilmington,
PA-NJ-DE-MD 37980 | Philadelphia-Reading-Camden,
PA-NJ-DE-MD 428 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ChesterCounty+PA |
| | | Clarion County | PA | 42031 | | | | Non-metropolitan | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=ClarionCounty+PA |
| | | Clearfield County | PA | 42033 | | DuBois, PA 20180 | State College-DuBois, PA 524 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ClearfieldCounty+PA |
| | | Clinton County | PA | 42035 | | Lock Haven, PA 30820 | Williamsport-Lock Haven,
PA 558 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=ClintonCounty+PA |
| | | Columbia County | PA | 42037 | | Bloomsburg-Berwick, PA 14100 | Bloomsburg-Berwick-Sunbury,
PA 146 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ColumbiaCounty+PA |
| | | Crawford County | PA | 42039 | | Meadville, PA 32740 | Erie-Meadville, PA 240 | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=CrawfordCounty+PA |
