| Clayton to Cascais | 1,102.06 mi (1,773.60 km) |
| Clayton to Castelo Branco | 1,000.89 mi (1,610.77 km) |
| Clayton to Castro Daire | 934.18 mi (1,503.42 km) |
| Clayton to Celorico de Basto | 903.03 mi (1,453.29 km) |
| Clayton to Chamusca | 1,045.14 mi (1,682.00 km) |
| Clayton to Chaves | 871.80 mi (1,403.03 km) |
| Clayton to Cinfaes | 923.77 mi (1,486.66 km) |
| Clayton to Coimbra | 987.07 mi (1,588.54 km) |
| Clayton to Condeixa-a-Nova | 994.37 mi (1,600.29 km) |
| Clayton to Corroios | 1,103.71 mi (1,776.25 km) |
| Clayton to Coruche | 1,071.97 mi (1,725.18 km) |
| Clayton to Costa de Caparica | 1,102.99 mi (1,775.09 km) |
| Clayton to Covilha | 969.57 mi (1,560.38 km) |
| Clayton to Eiras | 984.94 mi (1,585.10 km) |
| Clayton to Elvas | 1,060.78 mi (1,707.16 km) |
