| Piqua to Collegno | 4,417.22 mi (7,108.83 km) |
| Piqua to Cologno al Serio | 4,486.06 mi (7,219.61 km) |
| Piqua to Cologno Monzese | 4,470.90 mi (7,195.21 km) |
| Piqua to Colorno | 4,538.38 mi (7,303.81 km) |
| Piqua to Comacchio | 4,620.66 mi (7,436.23 km) |
| Piqua to Comiso | 5,038.37 mi (8,108.47 km) |
| Piqua to Como | 4,452.64 mi (7,165.84 km) |
| Piqua to Concordia Sagittaria | 4,605.91 mi (7,412.49 km) |
| Piqua to Concorezzo | 4,470.98 mi (7,195.35 km) |
| Piqua to Conegliano | 4,579.23 mi (7,369.56 km) |
| Piqua to Conselice | 4,613.56 mi (7,424.80 km) |
| Piqua to Conselve | 4,587.17 mi (7,382.33 km) |
| Piqua to Conversano | 4,974.57 mi (8,005.80 km) |
| Piqua to Copertino | 5,042.97 mi (8,115.87 km) |
| Piqua to Copparo | 4,598.70 mi (7,400.89 km) |
