| Gloucester to Nuth | 356.29 mi (573.39 km) |
| Gloucester to Oegstgeest | 286.07 mi (460.39 km) |
| Gloucester to Oirschot | 324.03 mi (521.48 km) |
| Gloucester to Oisterwijk | 319.07 mi (513.50 km) |
| Gloucester to Oldebroek | 347.40 mi (559.09 km) |
| Gloucester to Oldenzaal | 390.60 mi (628.61 km) |
| Gloucester to Ommen | 369.39 mi (594.47 km) |
| Gloucester to Oosterend | 358.60 mi (577.12 km) |
| Gloucester to Oosterhout | 304.00 mi (489.24 km) |
| Gloucester to Oosterwolde | 367.70 mi (591.75 km) |
| Gloucester to Oostzaan | 304.61 mi (490.22 km) |
| Gloucester to Opmeer | 309.40 mi (497.93 km) |
| Gloucester to Oss | 331.41 mi (533.36 km) |
| Gloucester to Oud-Beijerland | 283.57 mi (456.36 km) |
| Gloucester to Oudenbosch | 290.18 mi (467.00 km) |
