| Mercer Island to Cascais | 5,188.33 mi (8,349.81 km) |
| Mercer Island to Castelo Branco | 5,194.47 mi (8,359.70 km) |
| Mercer Island to Castro Daire | 5,122.23 mi (8,243.43 km) |
| Mercer Island to Celorico de Basto | 5,094.35 mi (8,198.57 km) |
| Mercer Island to Chamusca | 5,186.01 mi (8,346.08 km) |
| Mercer Island to Chaves | 5,092.86 mi (8,196.16 km) |
| Mercer Island to Cinfaes | 5,104.94 mi (8,215.60 km) |
| Mercer Island to Coimbra | 5,142.14 mi (8,275.47 km) |
| Mercer Island to Condeixa-a-Nova | 5,144.75 mi (8,279.67 km) |
| Mercer Island to Corroios | 5,202.06 mi (8,371.91 km) |
| Mercer Island to Coruche | 5,205.41 mi (8,377.30 km) |
| Mercer Island to Costa de Caparica | 5,197.54 mi (8,364.64 km) |
| Mercer Island to Covilha | 5,169.56 mi (8,319.60 km) |
| Mercer Island to Eiras | 5,140.67 mi (8,273.11 km) |
| Mercer Island to Elvas | 5,257.17 mi (8,460.60 km) |
