| Geldern to Oestrich-Winkel | 127.81 mi (205.69 km) |
| Geldern to Offenburg | 222.59 mi (358.22 km) |
| Geldern to Oftersheim | 178.50 mi (287.27 km) |
| Geldern to Ohrdruf | 196.48 mi (316.20 km) |
| Geldern to Ohringen | 212.52 mi (342.02 km) |
| Geldern to Olbernhau | 309.33 mi (497.82 km) |
| Geldern to Olching | 319.07 mi (513.49 km) |
| Geldern to Oldenburg | 137.48 mi (221.25 km) |
| Geldern to Oldenburg in Holstein | 269.82 mi (434.23 km) |
| Geldern to Olfen | 47.09 mi (75.78 km) |
| Geldern to Olpe | 73.60 mi (118.45 km) |
| Geldern to Olsberg | 93.38 mi (150.28 km) |
| Geldern to Oranienburg | 304.84 mi (490.59 km) |
| Geldern to Ortenberg | 143.24 mi (230.52 km) |
| Geldern to Oschatz | 292.25 mi (470.34 km) |
