| Round Rock to Cividale del Friuli | 5,618.32 mi (9,041.82 km) |
| Round Rock to Civita Castellana | 5,729.70 mi (9,221.06 km) |
| Round Rock to Civitanova Marche | 5,743.62 mi (9,243.47 km) |
| Round Rock to Civitavecchia | 5,712.00 mi (9,192.58 km) |
| Round Rock to Civitella in Val di Chiana | 5,656.44 mi (9,103.16 km) |
| Round Rock to Clusone | 5,488.98 mi (8,833.66 km) |
| Round Rock to Coccaglio | 5,502.29 mi (8,855.09 km) |
| Round Rock to Codigoro | 5,616.76 mi (9,039.29 km) |
| Round Rock to Codogno | 5,506.55 mi (8,861.93 km) |
| Round Rock to Codroipo | 5,606.10 mi (9,022.14 km) |
| Round Rock to Cogoleto | 5,492.05 mi (8,838.59 km) |
| Round Rock to Colle di Val d'Elsa | 5,633.01 mi (9,065.45 km) |
| Round Rock to Colle Salvetti | 5,598.30 mi (9,009.60 km) |
| Round Rock to Collecchio | 5,543.05 mi (8,920.67 km) |
| Round Rock to Colleferro | 5,777.66 mi (9,298.25 km) |
