| Caister-on-Sea to Oerlinghausen | 296.58 mi (477.30 km) |
| Caister-on-Sea to Oestrich-Winkel | 326.57 mi (525.56 km) |
| Caister-on-Sea to Offenburg | 396.77 mi (638.55 km) |
| Caister-on-Sea to Oftersheim | 374.02 mi (601.93 km) |
| Caister-on-Sea to Ohrdruf | 404.81 mi (651.48 km) |
| Caister-on-Sea to Ohringen | 413.50 mi (665.46 km) |
| Caister-on-Sea to Olbernhau | 515.12 mi (829.00 km) |
| Caister-on-Sea to Olching | 521.35 mi (839.04 km) |
| Caister-on-Sea to Oldenburg | 272.17 mi (438.01 km) |
| Caister-on-Sea to Oldenburg in Holstein | 392.82 mi (632.19 km) |
| Caister-on-Sea to Olfen | 247.84 mi (398.86 km) |
| Caister-on-Sea to Olpe | 283.76 mi (456.67 km) |
| Caister-on-Sea to Olsberg | 300.75 mi (484.01 km) |
| Caister-on-Sea to Oranienburg | 481.18 mi (774.38 km) |
| Caister-on-Sea to Ortenberg | 352.37 mi (567.08 km) |
