| Ottumwa to Oschatz | 4,649.83 mi (7,483.18 km) |
| Ottumwa to Oschersleben | 4,556.52 mi (7,333.01 km) |
| Ottumwa to Osnabruck | 4,435.44 mi (7,138.15 km) |
| Ottumwa to Ostbevern | 4,437.87 mi (7,142.05 km) |
| Ottumwa to Osterburg | 4,542.40 mi (7,310.29 km) |
| Ottumwa to Ostercappeln | 4,439.20 mi (7,144.20 km) |
| Ottumwa to Osterhofen | 4,758.28 mi (7,657.72 km) |
| Ottumwa to Osterholz-Scharmbeck | 4,424.70 mi (7,120.86 km) |
| Ottumwa to Osternienburg | 4,591.64 mi (7,389.54 km) |
| Ottumwa to Osterode | 4,534.03 mi (7,296.81 km) |
| Ottumwa to Osterwieck | 4,540.32 mi (7,306.93 km) |
| Ottumwa to Ostfildern | 4,620.90 mi (7,436.62 km) |
| Ottumwa to Osthofen | 4,547.65 mi (7,318.73 km) |
| Ottumwa to Ostrhauderfehn | 4,388.07 mi (7,061.91 km) |
| Ottumwa to Ostringen | 4,581.31 mi (7,372.91 km) |
