| Ottumwa to Opwijk | 4,347.57 mi (6,996.74 km) |
| Ottumwa to Ostend | 4,291.63 mi (6,906.72 km) |
| Ottumwa to Oud-Heverlee | 4,370.27 mi (7,033.26 km) |
| Ottumwa to Oud-Turnhout | 4,363.59 mi (7,022.52 km) |
| Ottumwa to Oudenaarde | 4,330.48 mi (6,969.23 km) |
| Ottumwa to Oudenburg | 4,296.15 mi (6,913.98 km) |
| Ottumwa to Oupeye | 4,410.66 mi (7,098.26 km) |
| Ottumwa to Overijse | 4,367.26 mi (7,028.43 km) |
| Ottumwa to Overpelt | 4,383.06 mi (7,053.85 km) |
| Ottumwa to Paal | 4,380.94 mi (7,050.45 km) |
| Ottumwa to Peer | 4,387.58 mi (7,061.12 km) |
| Ottumwa to Pepinster | 4,422.42 mi (7,117.19 km) |
| Ottumwa to Peruwelz | 4,342.22 mi (6,988.12 km) |
| Ottumwa to Perwez | 4,383.60 mi (7,054.72 km) |
| Ottumwa to Philippeville | 4,389.88 mi (7,064.83 km) |
