| Piqua to Cloverleaf (Texas) | 944.73 mi (1,520.39 km) |
| Piqua to Cloverly (Maryland) | 392.10 mi (631.02 km) |
| Piqua to Clovis (California) | 1,917.49 mi (3,085.90 km) |
| Piqua to Clovis (New Mexico) | 1,111.05 mi (1,788.07 km) |
| Piqua to Clute (Texas) | 994.91 mi (1,601.15 km) |
| Piqua to Coachella (California) | 1,807.12 mi (2,908.28 km) |
| Piqua to Coalinga (California) | 1,966.31 mi (3,164.47 km) |
| Piqua to Coamo (Puerto Rico) | 1,860.31 mi (2,993.89 km) |
| Piqua to Coatesville (Pennsylvania) | 445.41 mi (716.82 km) |
| Piqua to Cockeysville (Maryland) | 406.64 mi (654.42 km) |
| Piqua to Cocoa (Florida) | 836.81 mi (1,346.72 km) |
| Piqua to Cocoa Beach (Florida) | 842.05 mi (1,355.14 km) |
| Piqua to Coconut Creek (Florida) | 986.34 mi (1,587.37 km) |
| Piqua to Coeur d'Alene (Idaho) | 1,687.37 mi (2,715.56 km) |
| Piqua to Cohoes (New York) | 574.39 mi (924.39 km) |
