| North Adams to Oberkirch | 3,756.88 mi (6,046.11 km) |
| North Adams to Obernburg am Main | 3,759.31 mi (6,050.02 km) |
| North Adams to Obernkirchen | 3,685.95 mi (5,931.96 km) |
| North Adams to Oberschleissheim | 3,907.49 mi (6,288.50 km) |
| North Adams to Oberstdorf | 3,882.85 mi (6,248.84 km) |
| North Adams to Obertraubling | 3,907.84 mi (6,289.07 km) |
| North Adams to Obertshausen | 3,740.10 mi (6,019.10 km) |
| North Adams to Oberursel | 3,725.76 mi (5,996.02 km) |
| North Adams to Ochsenfurt | 3,802.11 mi (6,118.91 km) |
| North Adams to Ochsenhausen | 3,847.65 mi (6,192.19 km) |
| North Adams to Ochtrup | 3,613.30 mi (5,815.04 km) |
| North Adams to Odenthal | 3,643.44 mi (5,863.55 km) |
| North Adams to Oelde | 3,661.05 mi (5,891.89 km) |
| North Adams to Oelsnitz | 3,860.50 mi (6,212.87 km) |
| North Adams to Oer-Erkenschwick | 3,631.42 mi (5,844.21 km) |
