| Piqua to Cordele (Georgia) | 566.79 mi (912.16 km) |
| Piqua to Corinth (Mississippi) | 428.78 mi (690.05 km) |
| Piqua to Corinth (Texas) | 858.70 mi (1,381.94 km) |
| Piqua to Cornelius (North Carolina) | 371.64 mi (598.10 km) |
| Piqua to Cornelius (Oregon) | 1,980.92 mi (3,187.99 km) |
| Piqua to Corning (New York) | 398.44 mi (641.23 km) |
| Piqua to Corona (California) | 1,877.39 mi (3,021.37 km) |
| Piqua to Coronado (California) | 1,890.02 mi (3,041.70 km) |
| Piqua to Corpus Christi (Texas) | 1,139.16 mi (1,833.30 km) |
| Piqua to Corsicana (Texas) | 879.51 mi (1,415.43 km) |
| Piqua to Cortland (New York) | 450.90 mi (725.66 km) |
| Piqua to Corvallis (Oregon) | 1,996.70 mi (3,213.38 km) |
| Piqua to Coshocton (Ohio) | 126.67 mi (203.85 km) |
| Piqua to Costa Mesa (California) | 1,901.11 mi (3,059.54 km) |
| Piqua to Coto de Caza (California) | 1,885.79 mi (3,034.89 km) |
