| Gloucester to Opole | 873.42 mi (1,405.63 km) |
| Gloucester to Orzesze | 917.13 mi (1,475.97 km) |
| Gloucester to Osowa | 873.14 mi (1,405.18 km) |
| Gloucester to Ostroda | 932.93 mi (1,501.41 km) |
| Gloucester to Ostroleka | 1,001.09 mi (1,611.10 km) |
| Gloucester to Ostrow Mazowiecka | 1,016.66 mi (1,636.15 km) |
| Gloucester to Ostrow Wielkopolski | 855.39 mi (1,376.61 km) |
| Gloucester to Ostrowiec Swietokrzyski | 1,016.77 mi (1,636.34 km) |
| Gloucester to Ostrzeszow | 862.98 mi (1,388.83 km) |
| Gloucester to Oswiecim | 939.34 mi (1,511.72 km) |
| Gloucester to Otwock | 996.10 mi (1,603.06 km) |
| Gloucester to Ozarow Mazowiecki | 975.55 mi (1,569.99 km) |
| Gloucester to Ozimek | 885.24 mi (1,424.66 km) |
| Gloucester to Ozorkow | 914.14 mi (1,471.17 km) |
| Gloucester to Pabianice | 921.70 mi (1,483.33 km) |
