| Clayton to Cividale del Friuli | 858.01 mi (1,380.83 km) |
| Clayton to Civita Castellana | 1,026.41 mi (1,651.84 km) |
| Clayton to Civitanova Marche | 1,010.81 mi (1,626.74 km) |
| Clayton to Civitavecchia | 1,020.31 mi (1,642.03 km) |
| Clayton to Civitella in Val di Chiana | 942.89 mi (1,517.44 km) |
| Clayton to Clusone | 754.89 mi (1,214.87 km) |
| Clayton to Coccaglio | 772.94 mi (1,243.92 km) |
| Clayton to Codigoro | 878.02 mi (1,413.04 km) |
| Clayton to Codogno | 786.93 mi (1,266.43 km) |
| Clayton to Codroipo | 849.05 mi (1,366.41 km) |
| Clayton to Cogoleto | 801.45 mi (1,289.80 km) |
| Clayton to Colle di Val d'Elsa | 926.90 mi (1,491.70 km) |
| Clayton to Colle Salvetti | 897.08 mi (1,443.71 km) |
| Clayton to Collecchio | 824.59 mi (1,327.04 km) |
| Clayton to Colleferro | 1,076.09 mi (1,731.80 km) |
