| Piqua to Carrollwood (Florida) | 841.32 mi (1,353.98 km) |
| Piqua to Carson (California) | 1,914.51 mi (3,081.10 km) |
| Piqua to Carson City (Nevada) | 1,877.36 mi (3,021.31 km) |
| Piqua to Carteret (New Jersey) | 527.82 mi (849.44 km) |
| Piqua to Cartersville (Georgia) | 414.74 mi (667.46 km) |
| Piqua to Carthage (Missouri) | 581.57 mi (935.95 km) |
| Piqua to Cary (Illinois) | 252.31 mi (406.06 km) |
| Piqua to Cary (North Carolina) | 422.23 mi (679.52 km) |
| Piqua to Casa de Oro-Mount Helix (California) | 1,877.03 mi (3,020.79 km) |
| Piqua to Casa Grande (Arizona) | 1,600.13 mi (2,575.16 km) |
| Piqua to Casas Adobes (Arizona) | 1,578.73 mi (2,540.73 km) |
| Piqua to Cascades (Virginia) | 372.82 mi (600.00 km) |
| Piqua to Casper (Wyoming) | 1,154.09 mi (1,857.33 km) |
| Piqua to Casselberry (Florida) | 810.91 mi (1,305.04 km) |
| Piqua to Castaic (California) | 1,917.25 mi (3,085.52 km) |
