| Walnut Creek to Oberkirch | 5,727.78 mi (9,217.97 km) |
| Walnut Creek to Obernburg am Main | 5,684.65 mi (9,148.56 km) |
| Walnut Creek to Obernkirchen | 5,550.03 mi (8,931.91 km) |
| Walnut Creek to Oberschleissheim | 5,838.04 mi (9,395.41 km) |
| Walnut Creek to Oberstdorf | 5,850.69 mi (9,415.78 km) |
| Walnut Creek to Obertraubling | 5,813.11 mi (9,355.30 km) |
| Walnut Creek to Obertshausen | 5,663.90 mi (9,115.16 km) |
| Walnut Creek to Oberursel | 5,649.52 mi (9,092.02 km) |
| Walnut Creek to Ochsenfurt | 5,719.77 mi (9,205.08 km) |
| Walnut Creek to Ochsenhausen | 5,804.62 mi (9,341.63 km) |
| Walnut Creek to Ochtrup | 5,503.43 mi (8,856.92 km) |
| Walnut Creek to Odenthal | 5,564.97 mi (8,955.96 km) |
| Walnut Creek to Oelde | 5,548.84 mi (8,930.00 km) |
| Walnut Creek to Oelsnitz | 5,730.68 mi (9,222.65 km) |
| Walnut Creek to Oer-Erkenschwick | 5,535.56 mi (8,908.62 km) |
