| Dorchester to Opole | 888.79 mi (1,430.37 km) |
| Dorchester to Orzesze | 930.08 mi (1,496.83 km) |
| Dorchester to Osowa | 910.80 mi (1,465.79 km) |
| Dorchester to Ostroda | 966.39 mi (1,555.26 km) |
| Dorchester to Ostroleka | 1,031.34 mi (1,659.78 km) |
| Dorchester to Ostrow Mazowiecka | 1,045.61 mi (1,682.75 km) |
| Dorchester to Ostrow Wielkopolski | 876.72 mi (1,410.94 km) |
| Dorchester to Ostrowiec Swietokrzyski | 1,035.95 mi (1,667.21 km) |
| Dorchester to Ostrzeszow | 882.93 mi (1,420.94 km) |
| Dorchester to Oswiecim | 952.06 mi (1,532.20 km) |
| Dorchester to Otwock | 1,021.38 mi (1,643.75 km) |
| Dorchester to Ozarow Mazowiecki | 1,001.20 mi (1,611.28 km) |
| Dorchester to Ozimek | 900.86 mi (1,449.79 km) |
| Dorchester to Ozorkow | 937.92 mi (1,509.43 km) |
| Dorchester to Pabianice | 943.70 mi (1,518.74 km) |
