| Piqua to Clarksdale (Mississippi) | 538.84 mi (867.18 km) |
| Piqua to Clarkston (Georgia) | 437.98 mi (704.85 km) |
| Piqua to Clarksville (Indiana) | 150.35 mi (241.97 km) |
| Piqua to Clarksville (Tennessee) | 298.93 mi (481.08 km) |
| Piqua to Clawson (Michigan) | 174.35 mi (280.59 km) |
| Piqua to Clay (Alabama) | 464.71 mi (747.88 km) |
| Piqua to Clayton (California) | 2,012.88 mi (3,239.41 km) |
| Piqua to Clayton (Missouri) | 341.13 mi (549.00 km) |
| Piqua to Clayton (North Carolina) | 442.63 mi (712.34 km) |
| Piqua to Clayton (Ohio) | 19.98 mi (32.15 km) |
| Piqua to Clearfield (Utah) | 1,452.07 mi (2,336.88 km) |
| Piqua to Clearlake (California) | 2,030.72 mi (3,268.12 km) |
| Piqua to Clearwater (Florida) | 845.20 mi (1,360.22 km) |
| Piqua to Cleburne (Texas) | 908.58 mi (1,462.22 km) |
| Piqua to Clemmons (North Carolina) | 353.46 mi (568.84 km) |
