| Piqua to Cadillac (Michigan) | 289.47 mi (465.86 km) |
| Piqua to Caguas (Puerto Rico) | 1,862.31 mi (2,997.10 km) |
| Piqua to Cahokia (Illinois) | 335.39 mi (539.75 km) |
| Piqua to Calabasas (California) | 1,928.25 mi (3,103.21 km) |
| Piqua to Caldwell (Idaho) | 1,673.62 mi (2,693.43 km) |
| Piqua to Caledonia (Wisconsin) | 262.30 mi (422.13 km) |
| Piqua to Calera (Alabama) | 504.74 mi (812.31 km) |
| Piqua to Calexico (California) | 1,801.94 mi (2,899.94 km) |
| Piqua to Calhoun (Georgia) | 392.89 mi (632.30 km) |
| Piqua to California (Maryland) | 433.93 mi (698.34 km) |
| Piqua to California City (California) | 1,860.10 mi (2,993.54 km) |
| Piqua to Callaway (Florida) | 695.96 mi (1,120.03 km) |
| Piqua to Calumet City (Illinois) | 200.10 mi (322.03 km) |
| Piqua to Calverton (Maryland) | 395.51 mi (636.51 km) |
| Piqua to Camano (Washington) | 1,951.75 mi (3,141.04 km) |
