| South Houston to Cascais | 4,765.00 mi (7,668.53 km) |
| South Houston to Castelo Branco | 4,830.99 mi (7,774.73 km) |
| South Houston to Castro Daire | 4,781.68 mi (7,695.38 km) |
| South Houston to Celorico de Basto | 4,766.11 mi (7,670.32 km) |
| South Houston to Chamusca | 4,794.72 mi (7,716.35 km) |
| South Houston to Chaves | 4,782.39 mi (7,696.51 km) |
| South Houston to Cinfaes | 4,766.88 mi (7,671.56 km) |
| South Houston to Coimbra | 4,775.18 mi (7,684.91 km) |
| South Houston to Condeixa-a-Nova | 4,774.13 mi (7,683.22 km) |
| South Houston to Corroios | 4,780.51 mi (7,693.49 km) |
| South Houston to Coruche | 4,802.78 mi (7,729.32 km) |
| South Houston to Costa de Caparica | 4,775.50 mi (7,685.42 km) |
| South Houston to Covilha | 4,818.74 mi (7,755.01 km) |
| South Houston to Eiras | 4,774.64 mi (7,684.04 km) |
| South Houston to Elvas | 4,873.54 mi (7,843.20 km) |
