| Tonawanda to Oberkirch | 3,975.23 mi (6,397.51 km) |
| Tonawanda to Obernburg am Main | 3,971.48 mi (6,391.47 km) |
| Tonawanda to Obernkirchen | 3,888.71 mi (6,258.28 km) |
| Tonawanda to Oberschleissheim | 4,122.20 mi (6,634.04 km) |
| Tonawanda to Oberstdorf | 4,102.26 mi (6,601.95 km) |
| Tonawanda to Obertraubling | 4,119.17 mi (6,629.17 km) |
| Tonawanda to Obertshausen | 3,951.81 mi (6,359.82 km) |
| Tonawanda to Oberursel | 3,937.28 mi (6,336.44 km) |
| Tonawanda to Ochsenfurt | 4,013.78 mi (6,459.55 km) |
| Tonawanda to Ochsenhausen | 4,065.19 mi (6,542.29 km) |
| Tonawanda to Ochtrup | 3,818.65 mi (6,145.53 km) |
| Tonawanda to Odenthal | 3,853.58 mi (6,201.73 km) |
| Tonawanda to Oelde | 3,866.75 mi (6,222.93 km) |
| Tonawanda to Oelsnitz | 4,066.50 mi (6,544.40 km) |
| Tonawanda to Oer-Erkenschwick | 3,838.98 mi (6,178.24 km) |
