| Gengenbach to Oegstgeest | 304.69 mi (490.35 km) |
| Gengenbach to Oirschot | 245.85 mi (395.67 km) |
| Gengenbach to Oisterwijk | 253.00 mi (407.16 km) |
| Gengenbach to Oldebroek | 294.90 mi (474.59 km) |
| Gengenbach to Oldenzaal | 274.79 mi (442.23 km) |
| Gengenbach to Ommen | 292.99 mi (471.53 km) |
| Gengenbach to Oosterend | 329.30 mi (529.95 km) |
| Gengenbach to Oosterhout | 264.30 mi (425.35 km) |
| Gengenbach to Oosterwolde | 326.00 mi (524.64 km) |
| Gengenbach to Oostzaan | 310.88 mi (500.31 km) |
| Gengenbach to Opmeer | 326.11 mi (524.82 km) |
| Gengenbach to Oss | 257.63 mi (414.62 km) |
| Gengenbach to Oud-Beijerland | 285.25 mi (459.07 km) |
| Gengenbach to Oudenbosch | 269.42 mi (433.59 km) |
| Gengenbach to Oudewater | 286.02 mi (460.31 km) |
