| Marshalltown to Octeville | 4,147.88 mi (6,675.37 km) |
| Marshalltown to Oignies | 4,291.13 mi (6,905.90 km) |
| Marshalltown to Oissel | 4,262.53 mi (6,859.88 km) |
| Marshalltown to Olivet | 4,349.44 mi (6,999.74 km) |
| Marshalltown to Ollioules | 4,695.14 mi (7,556.09 km) |
| Marshalltown to Olonne-sur-Mer | 4,255.03 mi (6,847.82 km) |
| Marshalltown to Oloron-Sainte-Marie | 4,429.88 mi (7,129.20 km) |
| Marshalltown to Onet Village | 4,514.29 mi (7,265.05 km) |
| Marshalltown to Onnaing | 4,316.42 mi (6,946.61 km) |
| Marshalltown to Orange | 4,612.10 mi (7,422.46 km) |
| Marshalltown to Orchies | 4,300.12 mi (6,920.38 km) |
| Marshalltown to Orleans | 4,348.28 mi (6,997.88 km) |
| Marshalltown to Orly | 4,334.47 mi (6,975.66 km) |
| Marshalltown to Ormesson-sur-Marne | 4,338.38 mi (6,981.94 km) |
| Marshalltown to Orsay | 4,328.44 mi (6,965.94 km) |
