| Pittsburgh to Clacton-on-Sea | 3,757.63 mi (6,047.32 km) |
| Pittsburgh to Clay Cross | 3,623.11 mi (5,830.83 km) |
| Pittsburgh to Clayton | 3,593.37 mi (5,782.96 km) |
| Pittsburgh to Clayton le Moors | 3,571.48 mi (5,747.74 km) |
| Pittsburgh to Cleckheaton | 3,598.30 mi (5,790.91 km) |
| Pittsburgh to Cleethorpes | 3,667.75 mi (5,902.67 km) |
| Pittsburgh to Clevedon | 3,606.52 mi (5,804.14 km) |
| Pittsburgh to Clifton | 3,638.43 mi (5,855.49 km) |
| Pittsburgh to Clifton | 3,616.56 mi (5,820.30 km) |
| Pittsburgh to Cliftonville | 3,778.59 mi (6,081.05 km) |
| Pittsburgh to Clitheroe | 3,569.06 mi (5,743.85 km) |
| Pittsburgh to Clydebank | 3,451.46 mi (5,554.58 km) |
| Pittsburgh to Coalville | 3,635.18 mi (5,850.26 km) |
| Pittsburgh to Coatbridge | 3,466.10 mi (5,578.15 km) |
| Pittsburgh to Cobham | 3,707.70 mi (5,966.96 km) |
