| Rock Island to Cascais | 4,127.94 mi (6,643.28 km) |
| Rock Island to Castelo Branco | 4,175.88 mi (6,720.42 km) |
| Rock Island to Castro Daire | 4,117.90 mi (6,627.12 km) |
| Rock Island to Celorico de Basto | 4,098.02 mi (6,595.13 km) |
| Rock Island to Chamusca | 4,147.73 mi (6,675.13 km) |
| Rock Island to Chaves | 4,109.19 mi (6,613.10 km) |
| Rock Island to Cinfaes | 4,101.91 mi (6,601.38 km) |
| Rock Island to Coimbra | 4,119.69 mi (6,630.00 km) |
| Rock Island to Condeixa-a-Nova | 4,119.80 mi (6,630.18 km) |
| Rock Island to Corroios | 4,143.27 mi (6,667.95 km) |
| Rock Island to Coruche | 4,159.77 mi (6,694.51 km) |
| Rock Island to Costa de Caparica | 4,138.28 mi (6,659.92 km) |
| Rock Island to Covilha | 4,159.22 mi (6,693.62 km) |
| Rock Island to Eiras | 4,118.84 mi (6,628.63 km) |
| Rock Island to Elvas | 4,226.14 mi (6,801.31 km) |
