| Walnut Park to Oberkirch | 5,847.64 mi (9,410.87 km) |
| Walnut Park to Obernburg am Main | 5,812.25 mi (9,353.91 km) |
| Walnut Park to Obernkirchen | 5,686.20 mi (9,151.06 km) |
| Walnut Park to Oberschleissheim | 5,967.12 mi (9,603.15 km) |
| Walnut Park to Oberstdorf | 5,973.03 mi (9,612.66 km) |
| Walnut Park to Obertraubling | 5,946.38 mi (9,569.78 km) |
| Walnut Park to Obertshausen | 5,791.44 mi (9,320.42 km) |
| Walnut Park to Oberursel | 5,776.83 mi (9,296.91 km) |
| Walnut Park to Ochsenfurt | 5,849.32 mi (9,413.57 km) |
| Walnut Park to Ochsenhausen | 5,928.29 mi (9,540.66 km) |
| Walnut Park to Ochtrup | 5,634.30 mi (9,067.53 km) |
| Walnut Park to Odenthal | 5,691.31 mi (9,159.28 km) |
| Walnut Park to Oelde | 5,680.89 mi (9,142.50 km) |
| Walnut Park to Oelsnitz | 5,868.83 mi (9,444.96 km) |
| Walnut Park to Oer-Erkenschwick | 5,664.50 mi (9,116.14 km) |
