| Marshalltown to Orbetello | 4,936.76 mi (7,944.94 km) |
| Marshalltown to Oria | 5,272.42 mi (8,485.13 km) |
| Marshalltown to Oristano | 4,945.72 mi (7,959.37 km) |
| Marshalltown to Orta Nova | 5,160.22 mi (8,304.57 km) |
| Marshalltown to Orte | 4,981.07 mi (8,016.25 km) |
| Marshalltown to Ortona | 5,062.86 mi (8,147.88 km) |
| Marshalltown to Orvieto | 4,958.78 mi (7,980.39 km) |
| Marshalltown to Orzinuovi | 4,756.88 mi (7,655.45 km) |
| Marshalltown to Osimo | 4,976.06 mi (8,008.19 km) |
| Marshalltown to Ospitaletto | 4,755.38 mi (7,653.04 km) |
| Marshalltown to Ostuni | 5,259.29 mi (8,464.01 km) |
| Marshalltown to Ottaviano | 5,135.72 mi (8,265.14 km) |
| Marshalltown to Ovada | 4,740.87 mi (7,629.70 km) |
| Marshalltown to Ozieri | 4,932.27 mi (7,937.72 km) |
| Marshalltown to Paceco | 5,193.32 mi (8,357.84 km) |
