| Mason City to Orthez | 4,378.45 mi (7,046.43 km) |
| Mason City to Orvault | 4,196.84 mi (6,754.16 km) |
| Mason City to Osny | 4,269.03 mi (6,870.35 km) |
| Mason City to Ostwald | 4,497.36 mi (7,237.80 km) |
| Mason City to Ouistreham | 4,173.44 mi (6,716.49 km) |
| Mason City to Oullins | 4,508.53 mi (7,255.78 km) |
| Mason City to Outreau | 4,188.25 mi (6,740.33 km) |
| Mason City to Oyonnax | 4,518.12 mi (7,271.21 km) |
| Mason City to Ozoir-la-Ferriere | 4,303.14 mi (6,925.24 km) |
| Mason City to Pace | 4,157.93 mi (6,691.55 km) |
| Mason City to Palaiseau | 4,289.41 mi (6,903.13 km) |
| Mason City to Pamiers | 4,490.41 mi (7,226.62 km) |
| Mason City to Panazol | 4,367.71 mi (7,029.15 km) |
| Mason City to Pantin | 4,288.07 mi (6,900.99 km) |
| Mason City to Paray-le-Monial | 4,451.56 mi (7,164.10 km) |
