| Towson to Oberkirch | 4,040.46 mi (6,502.49 km) |
| Towson to Obernburg am Main | 4,044.84 mi (6,509.54 km) |
| Towson to Obernkirchen | 3,973.88 mi (6,395.34 km) |
| Towson to Oberschleissheim | 4,192.15 mi (6,746.62 km) |
| Towson to Oberstdorf | 4,165.96 mi (6,704.46 km) |
| Towson to Obertraubling | 4,193.51 mi (6,748.81 km) |
| Towson to Obertshausen | 4,025.77 mi (6,478.86 km) |
| Towson to Oberursel | 4,011.50 mi (6,455.88 km) |
| Towson to Ochsenfurt | 4,087.76 mi (6,578.61 km) |
| Towson to Ochsenhausen | 4,131.43 mi (6,648.90 km) |
| Towson to Ochtrup | 3,900.69 mi (6,277.56 km) |
| Towson to Odenthal | 3,929.62 mi (6,324.12 km) |
| Towson to Oelde | 3,948.34 mi (6,354.23 km) |
| Towson to Oelsnitz | 4,147.59 mi (6,674.91 km) |
| Towson to Oer-Erkenschwick | 3,918.28 mi (6,305.86 km) |
