| Clarksburg to Cascais | 3,554.16 mi (5,719.87 km) |
| Clarksburg to Castelo Branco | 3,617.64 mi (5,822.03 km) |
| Clarksburg to Castro Daire | 3,567.50 mi (5,741.34 km) |
| Clarksburg to Celorico de Basto | 3,551.66 mi (5,715.84 km) |
| Clarksburg to Chamusca | 3,582.34 mi (5,765.22 km) |
| Clarksburg to Chaves | 3,567.74 mi (5,741.72 km) |
| Clarksburg to Cinfaes | 3,552.61 mi (5,717.37 km) |
| Clarksburg to Coimbra | 3,561.72 mi (5,732.04 km) |
| Clarksburg to Condeixa-a-Nova | 3,560.80 mi (5,730.55 km) |
| Clarksburg to Corroios | 3,569.67 mi (5,744.83 km) |
| Clarksburg to Coruche | 3,591.00 mi (5,779.16 km) |
| Clarksburg to Costa de Caparica | 3,564.65 mi (5,736.75 km) |
| Clarksburg to Covilha | 3,604.93 mi (5,801.58 km) |
| Clarksburg to Eiras | 3,561.15 mi (5,731.12 km) |
| Clarksburg to Elvas | 3,661.22 mi (5,892.16 km) |
