| Mason City to Cascais | 4,194.51 mi (6,750.42 km) |
| Mason City to Castelo Branco | 4,236.70 mi (6,818.30 km) |
| Mason City to Castro Daire | 4,176.24 mi (6,721.01 km) |
| Mason City to Celorico de Basto | 4,155.07 mi (6,686.94 km) |
| Mason City to Chamusca | 4,211.21 mi (6,777.28 km) |
| Mason City to Chaves | 4,164.50 mi (6,702.12 km) |
| Mason City to Cinfaes | 4,159.95 mi (6,694.79 km) |
| Mason City to Coimbra | 4,180.67 mi (6,728.14 km) |
| Mason City to Condeixa-a-Nova | 4,181.14 mi (6,728.90 km) |
| Mason City to Corroios | 4,209.71 mi (6,774.88 km) |
| Mason City to Coruche | 4,224.41 mi (6,798.52 km) |
| Mason City to Costa de Caparica | 4,204.76 mi (6,766.91 km) |
| Mason City to Covilha | 4,218.73 mi (6,789.39 km) |
| Mason City to Eiras | 4,179.72 mi (6,726.61 km) |
| Mason City to Elvas | 4,289.10 mi (6,902.64 km) |
