| Round Rock to Cascais | 4,852.83 mi (7,809.88 km) |
| Round Rock to Castelo Branco | 4,914.88 mi (7,909.73 km) |
| Round Rock to Castro Daire | 4,863.42 mi (7,826.92 km) |
| Round Rock to Celorico de Basto | 4,846.78 mi (7,800.14 km) |
| Round Rock to Chamusca | 4,880.39 mi (7,854.24 km) |
| Round Rock to Chaves | 4,861.84 mi (7,824.37 km) |
| Round Rock to Cinfaes | 4,848.30 mi (7,802.59 km) |
| Round Rock to Coimbra | 4,858.86 mi (7,819.58 km) |
| Round Rock to Condeixa-a-Nova | 4,858.08 mi (7,818.32 km) |
| Round Rock to Corroios | 4,868.34 mi (7,834.83 km) |
| Round Rock to Coruche | 4,889.37 mi (7,868.68 km) |
| Round Rock to Costa de Caparica | 4,863.32 mi (7,826.75 km) |
| Round Rock to Covilha | 4,901.57 mi (7,888.31 km) |
| Round Rock to Eiras | 4,858.25 mi (7,818.59 km) |
| Round Rock to Elvas | 4,959.29 mi (7,981.20 km) |
