| Southborough to Cadiz | 1,061.01 mi (1,707.53 km) |
| Southborough to Calafell | 690.92 mi (1,111.93 km) |
| Southborough to Calahorra | 621.13 mi (999.62 km) |
| Southborough to Calasparra | 898.43 mi (1,445.89 km) |
| Southborough to Calatayud | 683.77 mi (1,100.42 km) |
| Southborough to Caldas de Montbuy | 664.40 mi (1,069.25 km) |
| Southborough to Caldas de Reyes | 724.37 mi (1,165.76 km) |
| Southborough to Calella | 669.09 mi (1,076.80 km) |
| Southborough to Callosa de Segura | 902.52 mi (1,452.46 km) |
| Southborough to Calpe | 864.76 mi (1,391.69 km) |
| Southborough to Calvia | 808.33 mi (1,300.88 km) |
| Southborough to Camas | 999.40 mi (1,608.38 km) |
| Southborough to Cambados | 734.77 mi (1,182.50 km) |
| Southborough to Cambre | 676.51 mi (1,088.74 km) |
| Southborough to Cambrils | 698.36 mi (1,123.91 km) |
