| Williamstown to Oberkirch | 3,959.78 mi (6,372.66 km) |
| Williamstown to Obernburg am Main | 3,965.40 mi (6,381.69 km) |
| Williamstown to Obernkirchen | 3,896.42 mi (6,270.68 km) |
| Williamstown to Oberschleissheim | 4,112.10 mi (6,617.79 km) |
| Williamstown to Oberstdorf | 4,085.00 mi (6,574.16 km) |
| Williamstown to Obertraubling | 4,114.14 mi (6,621.07 km) |
| Williamstown to Obertshausen | 3,946.44 mi (6,351.17 km) |
| Williamstown to Oberursel | 3,932.21 mi (6,328.27 km) |
| Williamstown to Ochsenfurt | 4,008.39 mi (6,450.87 km) |
| Williamstown to Ochsenhausen | 4,050.86 mi (6,519.23 km) |
| Williamstown to Ochtrup | 3,822.75 mi (6,152.12 km) |
| Williamstown to Odenthal | 3,850.67 mi (6,197.06 km) |
| Williamstown to Oelde | 3,870.29 mi (6,228.62 km) |
| Williamstown to Oelsnitz | 4,069.34 mi (6,548.97 km) |
| Williamstown to Oer-Erkenschwick | 3,839.86 mi (6,179.66 km) |
