| Castricum to Oberkirch | 315.40 mi (507.58 km) |
| Castricum to Obernburg am Main | 269.35 mi (433.47 km) |
| Castricum to Obernkirchen | 188.60 mi (303.52 km) |
| Castricum to Oberschleissheim | 424.64 mi (683.39 km) |
| Castricum to Oberstdorf | 433.68 mi (697.93 km) |
| Castricum to Obertraubling | 410.50 mi (660.63 km) |
| Castricum to Obertshausen | 248.57 mi (400.04 km) |
| Castricum to Oberursel | 233.88 mi (376.39 km) |
| Castricum to Ochsenfurt | 308.14 mi (495.91 km) |
| Castricum to Ochsenhausen | 387.11 mi (623.00 km) |
| Castricum to Ochtrup | 109.06 mi (175.52 km) |
| Castricum to Odenthal | 148.12 mi (238.38 km) |
| Castricum to Oelde | 155.61 mi (250.43 km) |
| Castricum to Oelsnitz | 354.55 mi (570.59 km) |
| Castricum to Oer-Erkenschwick | 126.34 mi (203.33 km) |
