| Caister-on-Sea to Oberkirch | 397.87 mi (640.31 km) |
| Caister-on-Sea to Obernburg am Main | 374.42 mi (602.57 km) |
| Caister-on-Sea to Obernkirchen | 311.90 mi (501.96 km) |
| Caister-on-Sea to Oberschleissheim | 528.08 mi (849.86 km) |
| Caister-on-Sea to Oberstdorf | 523.77 mi (842.93 km) |
| Caister-on-Sea to Obertraubling | 521.18 mi (838.75 km) |
| Caister-on-Sea to Obertshausen | 354.35 mi (570.27 km) |
| Caister-on-Sea to Oberursel | 339.69 mi (546.68 km) |
| Caister-on-Sea to Ochsenfurt | 416.10 mi (669.66 km) |
| Caister-on-Sea to Ochsenhausen | 480.31 mi (772.98 km) |
| Caister-on-Sea to Ochtrup | 231.91 mi (373.22 km) |
| Caister-on-Sea to Odenthal | 255.47 mi (411.14 km) |
| Caister-on-Sea to Oelde | 277.20 mi (446.12 km) |
| Caister-on-Sea to Oelsnitz | 473.75 mi (762.43 km) |
| Caister-on-Sea to Oer-Erkenschwick | 244.04 mi (392.74 km) |
