| Cayce to Oberkirch | 4,472.71 mi (7,198.13 km) |
| Cayce to Obernburg am Main | 4,480.47 mi (7,210.62 km) |
| Cayce to Obernkirchen | 4,413.90 mi (7,103.49 km) |
| Cayce to Oberschleissheim | 4,626.14 mi (7,445.05 km) |
| Cayce to Oberstdorf | 4,597.27 mi (7,398.59 km) |
| Cayce to Obertraubling | 4,629.28 mi (7,450.11 km) |
| Cayce to Obertshausen | 4,461.68 mi (7,180.37 km) |
| Cayce to Oberursel | 4,447.52 mi (7,157.59 km) |
| Cayce to Ochsenfurt | 4,523.56 mi (7,279.96 km) |
| Cayce to Ochsenhausen | 4,563.94 mi (7,344.96 km) |
| Cayce to Ochtrup | 4,339.77 mi (6,984.19 km) |
| Cayce to Odenthal | 4,366.49 mi (7,027.18 km) |
| Cayce to Oelde | 4,387.19 mi (7,060.49 km) |
| Cayce to Oelsnitz | 4,585.98 mi (7,380.41 km) |
| Cayce to Oer-Erkenschwick | 4,356.36 mi (7,010.89 km) |
