| Grass Valley to Collegno | 5,796.89 mi (9,329.20 km) |
| Grass Valley to Cologno al Serio | 5,830.85 mi (9,383.84 km) |
| Grass Valley to Cologno Monzese | 5,821.82 mi (9,369.32 km) |
| Grass Valley to Colorno | 5,886.71 mi (9,473.75 km) |
| Grass Valley to Comacchio | 5,950.57 mi (9,576.52 km) |
| Grass Valley to Comiso | 6,466.39 mi (10,406.65 km) |
| Grass Valley to Como | 5,800.66 mi (9,335.25 km) |
| Grass Valley to Concordia Sagittaria | 5,907.91 mi (9,507.86 km) |
| Grass Valley to Concorezzo | 5,820.08 mi (9,366.51 km) |
| Grass Valley to Conegliano | 5,886.08 mi (9,472.73 km) |
| Grass Valley to Conselice | 5,951.23 mi (9,577.59 km) |
| Grass Valley to Conselve | 5,911.45 mi (9,513.56 km) |
| Grass Valley to Conversano | 6,302.63 mi (10,143.10 km) |
| Grass Valley to Copertino | 6,369.24 mi (10,250.30 km) |
| Grass Valley to Copparo | 5,929.46 mi (9,542.54 km) |
