| Ottumwa to Octeville | 4,175.73 mi (6,720.18 km) |
| Ottumwa to Oignies | 4,322.07 mi (6,955.70 km) |
| Ottumwa to Oissel | 4,291.31 mi (6,906.19 km) |
| Ottumwa to Olivet | 4,376.92 mi (7,043.97 km) |
| Ottumwa to Ollioules | 4,719.58 mi (7,595.44 km) |
| Ottumwa to Olonne-sur-Mer | 4,279.13 mi (6,886.59 km) |
| Ottumwa to Oloron-Sainte-Marie | 4,450.69 mi (7,162.70 km) |
| Ottumwa to Onet Village | 4,538.21 mi (7,303.55 km) |
| Ottumwa to Onnaing | 4,347.56 mi (6,996.72 km) |
| Ottumwa to Orange | 4,637.02 mi (7,462.56 km) |
| Ottumwa to Orchies | 4,331.19 mi (6,970.38 km) |
| Ottumwa to Orleans | 4,375.81 mi (7,042.18 km) |
| Ottumwa to Orly | 4,363.19 mi (7,021.88 km) |
| Ottumwa to Ormesson-sur-Marne | 4,367.21 mi (7,028.35 km) |
| Ottumwa to Orsay | 4,357.00 mi (7,011.92 km) |
