| Guadarrama to Cividale del Friuli | 953.80 mi (1,535.00 km) |
| Guadarrama to Civita Castellana | 859.94 mi (1,383.93 km) |
| Guadarrama to Civitanova Marche | 931.23 mi (1,498.67 km) |
| Guadarrama to Civitavecchia | 828.32 mi (1,333.05 km) |
| Guadarrama to Civitella in Val di Chiana | 831.47 mi (1,338.12 km) |
| Guadarrama to Clusone | 791.12 mi (1,273.19 km) |
| Guadarrama to Coccaglio | 784.37 mi (1,262.32 km) |
| Guadarrama to Codigoro | 869.18 mi (1,398.81 km) |
| Guadarrama to Codogno | 762.43 mi (1,227.02 km) |
| Guadarrama to Codroipo | 930.20 mi (1,497.01 km) |
| Guadarrama to Cogoleto | 696.47 mi (1,120.85 km) |
| Guadarrama to Colle di Val d'Elsa | 802.31 mi (1,291.19 km) |
| Guadarrama to Colle Salvetti | 772.38 mi (1,243.03 km) |
| Guadarrama to Collecchio | 777.67 mi (1,251.54 km) |
| Guadarrama to Colleferro | 890.76 mi (1,433.54 km) |
