| Piqua to Crawfordsville (Indiana) | 140.44 mi (226.02 km) |
| Piqua to Crest Hill (Illinois) | 224.71 mi (361.64 km) |
| Piqua to Crestview (Florida) | 662.76 mi (1,066.60 km) |
| Piqua to Crestwood (Illinois) | 209.73 mi (337.52 km) |
| Piqua to Crestwood (Missouri) | 345.64 mi (556.25 km) |
| Piqua to Creve Coeur (Missouri) | 346.46 mi (557.57 km) |
| Piqua to Crofton (Maryland) | 410.24 mi (660.21 km) |
| Piqua to Crossville (Tennessee) | 293.18 mi (471.83 km) |
| Piqua to Crowley (Louisiana) | 824.88 mi (1,327.51 km) |
| Piqua to Crowley (Texas) | 896.27 mi (1,442.40 km) |
| Piqua to Crown Point (Indiana) | 184.25 mi (296.52 km) |
| Piqua to Crystal (Minnesota) | 573.01 mi (922.17 km) |
| Piqua to Crystal Lake (Illinois) | 256.76 mi (413.22 km) |
| Piqua to Cudahy (California) | 1,907.26 mi (3,069.44 km) |
| Piqua to Cudahy (Wisconsin) | 268.95 mi (432.83 km) |
