| Sleaford to Cividale del Friuli | 780.27 mi (1,255.73 km) |
| Sleaford to Civita Castellana | 947.23 mi (1,524.42 km) |
| Sleaford to Civitanova Marche | 931.71 mi (1,499.44 km) |
| Sleaford to Civitavecchia | 941.28 mi (1,514.85 km) |
| Sleaford to Civitella in Val di Chiana | 863.67 mi (1,389.94 km) |
| Sleaford to Clusone | 675.67 mi (1,087.38 km) |
| Sleaford to Coccaglio | 693.70 mi (1,116.39 km) |
| Sleaford to Codigoro | 798.95 mi (1,285.79 km) |
| Sleaford to Codogno | 707.73 mi (1,138.98 km) |
| Sleaford to Codroipo | 770.93 mi (1,240.69 km) |
| Sleaford to Cogoleto | 722.88 mi (1,163.37 km) |
| Sleaford to Colle di Val d'Elsa | 847.75 mi (1,364.33 km) |
| Sleaford to Colle Salvetti | 818.04 mi (1,316.51 km) |
| Sleaford to Collecchio | 745.38 mi (1,199.57 km) |
| Sleaford to Colleferro | 996.90 mi (1,604.35 km) |
