| Romeoville to Cascais | 4,007.77 mi (6,449.88 km) |
| Romeoville to Castelo Branco | 4,057.40 mi (6,529.76 km) |
| Romeoville to Castro Daire | 4,000.23 mi (6,437.75 km) |
| Romeoville to Celorico de Basto | 3,980.78 mi (6,406.45 km) |
| Romeoville to Chamusca | 4,028.46 mi (6,483.18 km) |
| Romeoville to Chaves | 3,992.51 mi (6,425.33 km) |
| Romeoville to Cinfaes | 3,984.35 mi (6,412.18 km) |
| Romeoville to Coimbra | 4,001.20 mi (6,439.30 km) |
| Romeoville to Condeixa-a-Nova | 4,001.19 mi (6,439.30 km) |
| Romeoville to Corroios | 4,023.13 mi (6,474.60 km) |
| Romeoville to Coruche | 4,040.16 mi (6,502.00 km) |
| Romeoville to Costa de Caparica | 4,018.14 mi (6,466.56 km) |
| Romeoville to Covilha | 4,041.16 mi (6,503.62 km) |
| Romeoville to Eiras | 4,000.37 mi (6,437.97 km) |
| Romeoville to Elvas | 4,106.98 mi (6,609.55 km) |
