| Rock Island to Benavente | 4,146.87 mi (6,673.74 km) |
| Rock Island to Bombarral | 4,119.82 mi (6,630.21 km) |
| Rock Island to Bougado | 4,074.55 mi (6,557.36 km) |
| Rock Island to Braga | 4,073.42 mi (6,555.54 km) |
| Rock Island to Braganca | 4,138.54 mi (6,660.34 km) |
| Rock Island to Cabeceiras de Basto | 4,092.06 mi (6,585.54 km) |
| Rock Island to Cacem | 4,130.45 mi (6,647.32 km) |
| Rock Island to Cadaval | 4,123.60 mi (6,636.29 km) |
| Rock Island to Caldas da Rainha | 4,115.80 mi (6,623.74 km) |
| Rock Island to Calheta | 3,969.94 mi (6,389.01 km) |
| Rock Island to Camara de Lobos | 3,980.34 mi (6,405.74 km) |
| Rock Island to Canico | 3,988.62 mi (6,419.07 km) |
| Rock Island to Cantanhede | 4,107.46 mi (6,610.32 km) |
| Rock Island to Carregal do Sal | 4,131.31 mi (6,648.69 km) |
| Rock Island to Cartaxo | 4,141.10 mi (6,664.46 km) |
