| Mason City to Noventa Vicentina | 4,779.92 mi (7,692.54 km) |
| Mason City to Novi di Modena | 4,774.22 mi (7,683.37 km) |
| Mason City to Novi Ligure | 4,701.06 mi (7,565.63 km) |
| Mason City to Nuoro | 4,921.51 mi (7,920.40 km) |
| Mason City to Occhiobello | 4,798.09 mi (7,721.78 km) |
| Mason City to Oderzo | 4,792.25 mi (7,712.38 km) |
| Mason City to Oggiono | 4,677.01 mi (7,526.92 km) |
| Mason City to Olbia | 4,900.79 mi (7,887.06 km) |
| Mason City to Oleggio | 4,658.38 mi (7,496.93 km) |
| Mason City to Olgiate Comasco | 4,662.77 mi (7,504.00 km) |
| Mason City to Olgiate Olona | 4,666.25 mi (7,509.60 km) |
| Mason City to Omegna | 4,637.77 mi (7,463.76 km) |
| Mason City to Opera | 4,689.70 mi (7,547.34 km) |
| Mason City to Oppeano | 4,766.30 mi (7,670.62 km) |
| Mason City to Orbassano | 4,642.91 mi (7,472.04 km) |
