| Southborough to Cascais | 980.63 mi (1,578.17 km) |
| Southborough to Castelo Branco | 868.16 mi (1,397.17 km) |
| Southborough to Castro Daire | 809.51 mi (1,302.78 km) |
| Southborough to Celorico de Basto | 781.25 mi (1,257.30 km) |
| Southborough to Chamusca | 918.75 mi (1,478.58 km) |
| Southborough to Chaves | 746.83 mi (1,201.91 km) |
| Southborough to Cinfaes | 801.82 mi (1,290.41 km) |
| Southborough to Coimbra | 863.70 mi (1,390.00 km) |
| Southborough to Condeixa-a-Nova | 871.20 mi (1,402.07 km) |
| Southborough to Corroios | 979.87 mi (1,576.95 km) |
| Southborough to Coruche | 944.48 mi (1,519.99 km) |
| Southborough to Costa de Caparica | 979.92 mi (1,577.03 km) |
| Southborough to Covilha | 838.56 mi (1,349.53 km) |
| Southborough to Eiras | 861.66 mi (1,386.70 km) |
| Southborough to Elvas | 922.23 mi (1,484.18 km) |
