| Clemson to Cascais | 3,964.04 mi (6,379.50 km) |
| Clemson to Castelo Branco | 4,032.55 mi (6,489.77 km) |
| Clemson to Castro Daire | 3,985.00 mi (6,413.24 km) |
| Clemson to Celorico de Basto | 3,970.38 mi (6,389.71 km) |
| Clemson to Chamusca | 3,995.05 mi (6,429.41 km) |
| Clemson to Chaves | 3,987.76 mi (6,417.68 km) |
| Clemson to Cinfaes | 3,970.49 mi (6,389.88 km) |
| Clemson to Coimbra | 3,976.94 mi (6,400.27 km) |
| Clemson to Condeixa-a-Nova | 3,975.69 mi (6,398.26 km) |
| Clemson to Corroios | 3,979.54 mi (6,404.45 km) |
| Clemson to Coruche | 4,002.51 mi (6,441.42 km) |
| Clemson to Costa de Caparica | 3,974.53 mi (6,396.39 km) |
| Clemson to Covilha | 4,021.13 mi (6,471.38 km) |
| Clemson to Eiras | 3,976.46 mi (6,399.50 km) |
| Clemson to Elvas | 4,073.76 mi (6,556.09 km) |
