| Keystone to Cascais | 4,173.37 mi (6,716.39 km) |
| Keystone to Castelo Branco | 4,254.07 mi (6,846.27 km) |
| Keystone to Castro Daire | 4,213.97 mi (6,781.73 km) |
| Keystone to Celorico de Basto | 4,202.90 mi (6,763.92 km) |
| Keystone to Chamusca | 4,211.18 mi (6,777.23 km) |
| Keystone to Chaves | 4,223.86 mi (6,797.64 km) |
| Keystone to Cinfaes | 4,200.63 mi (6,760.27 km) |
| Keystone to Coimbra | 4,199.79 mi (6,758.91 km) |
| Keystone to Condeixa-a-Nova | 4,197.68 mi (6,755.52 km) |
| Keystone to Corroios | 4,188.71 mi (6,741.08 km) |
| Keystone to Coruche | 4,215.53 mi (6,784.24 km) |
| Keystone to Costa de Caparica | 4,183.77 mi (6,733.13 km) |
| Keystone to Covilha | 4,246.19 mi (6,833.57 km) |
| Keystone to Eiras | 4,199.55 mi (6,758.53 km) |
| Keystone to Elvas | 4,288.74 mi (6,902.06 km) |
