| Mason City to Benavente | 4,211.85 mi (6,778.32 km) |
| Mason City to Bombarral | 4,184.45 mi (6,734.22 km) |
| Mason City to Bougado | 4,132.48 mi (6,650.58 km) |
| Mason City to Braga | 4,130.54 mi (6,647.47 km) |
| Mason City to Braganca | 4,192.71 mi (6,747.52 km) |
| Mason City to Cabeceiras de Basto | 4,148.70 mi (6,676.69 km) |
| Mason City to Cacem | 4,196.68 mi (6,753.90 km) |
| Mason City to Cadaval | 4,188.24 mi (6,740.33 km) |
| Mason City to Caldas da Rainha | 4,180.01 mi (6,727.07 km) |
| Mason City to Calheta | 4,063.46 mi (6,539.51 km) |
| Mason City to Camara de Lobos | 4,073.68 mi (6,555.95 km) |
| Mason City to Canico | 4,081.92 mi (6,569.21 km) |
| Mason City to Cantanhede | 4,168.28 mi (6,708.19 km) |
| Mason City to Carregal do Sal | 4,191.07 mi (6,744.88 km) |
| Mason City to Cartaxo | 4,205.55 mi (6,768.18 km) |
