| Mason City to Nyon | 4,534.57 mi (7,297.68 km) |
| Mason City to Oberriet | 4,617.59 mi (7,431.30 km) |
| Mason City to Obersiggenthal | 4,563.82 mi (7,344.76 km) |
| Mason City to Oberwil | 4,535.68 mi (7,299.46 km) |
| Mason City to Oberwingert | 4,579.91 mi (7,370.65 km) |
| Mason City to Oftringen | 4,557.39 mi (7,334.41 km) |
| Mason City to Olten | 4,555.35 mi (7,331.12 km) |
| Mason City to Onex | 4,538.01 mi (7,303.22 km) |
| Mason City to Opfikon | 4,576.16 mi (7,364.61 km) |
| Mason City to Ostermundigen | 4,557.13 mi (7,334.00 km) |
| Mason City to Payerne | 4,542.38 mi (7,310.26 km) |
| Mason City to Pfaffikon | 4,586.94 mi (7,381.96 km) |
| Mason City to Plan-les-Ouates | 4,539.34 mi (7,305.37 km) |
| Mason City to Pratteln | 4,540.87 mi (7,307.83 km) |
| Mason City to Prilly | 4,541.98 mi (7,309.61 km) |
