| North Tonawanda to Oberkirch | 3,973.14 mi (6,394.15 km) |
| North Tonawanda to Obernburg am Main | 3,969.35 mi (6,388.04 km) |
| North Tonawanda to Obernkirchen | 3,886.52 mi (6,254.75 km) |
| North Tonawanda to Oberschleissheim | 4,120.09 mi (6,630.64 km) |
| North Tonawanda to Oberstdorf | 4,100.18 mi (6,598.59 km) |
| North Tonawanda to Obertraubling | 4,117.04 mi (6,625.73 km) |
| North Tonawanda to Obertshausen | 3,949.68 mi (6,356.39 km) |
| North Tonawanda to Oberursel | 3,935.14 mi (6,333.00 km) |
| North Tonawanda to Ochsenfurt | 4,011.64 mi (6,456.12 km) |
| North Tonawanda to Ochsenhausen | 4,063.09 mi (6,538.91 km) |
| North Tonawanda to Ochtrup | 3,816.48 mi (6,142.03 km) |
| North Tonawanda to Odenthal | 3,851.43 mi (6,198.28 km) |
| North Tonawanda to Oelde | 3,864.57 mi (6,219.43 km) |
| North Tonawanda to Oelsnitz | 4,064.33 mi (6,540.90 km) |
| North Tonawanda to Oer-Erkenschwick | 3,836.82 mi (6,174.76 km) |
