| Round Rock to Collegno | 5,422.08 mi (8,726.00 km) |
| Round Rock to Cologno al Serio | 5,490.29 mi (8,835.77 km) |
| Round Rock to Cologno Monzese | 5,475.27 mi (8,811.60 km) |
| Round Rock to Colorno | 5,542.80 mi (8,920.27 km) |
| Round Rock to Comacchio | 5,624.71 mi (9,052.09 km) |
| Round Rock to Comiso | 6,042.10 mi (9,723.82 km) |
| Round Rock to Como | 5,456.90 mi (8,782.04 km) |
| Round Rock to Concordia Sagittaria | 5,608.84 mi (9,026.56 km) |
| Round Rock to Concorezzo | 5,475.31 mi (8,811.66 km) |
| Round Rock to Conegliano | 5,582.30 mi (8,983.84 km) |
| Round Rock to Conselice | 5,617.83 mi (9,041.02 km) |
| Round Rock to Conselve | 5,590.96 mi (8,997.78 km) |
| Round Rock to Conversano | 5,979.17 mi (9,622.55 km) |
| Round Rock to Copertino | 6,047.62 mi (9,732.70 km) |
| Round Rock to Copparo | 5,602.73 mi (9,016.72 km) |
