| Morriston to Opole | 946.58 mi (1,523.38 km) |
| Morriston to Orzesze | 990.00 mi (1,593.25 km) |
| Morriston to Osowa | 945.92 mi (1,522.31 km) |
| Morriston to Ostroda | 1,006.26 mi (1,619.42 km) |
| Morriston to Ostroleka | 1,074.68 mi (1,729.53 km) |
| Morriston to Ostrow Mazowiecka | 1,090.32 mi (1,754.69 km) |
| Morriston to Ostrow Wielkopolski | 929.04 mi (1,495.15 km) |
| Morriston to Ostrowiec Swietokrzyski | 1,090.33 mi (1,754.72 km) |
| Morriston to Ostrzeszow | 936.56 mi (1,507.24 km) |
| Morriston to Oswiecim | 1,012.19 mi (1,628.96 km) |
| Morriston to Otwock | 1,069.86 mi (1,721.77 km) |
| Morriston to Ozarow Mazowiecki | 1,049.31 mi (1,688.69 km) |
| Morriston to Ozimek | 958.44 mi (1,542.46 km) |
| Morriston to Ozorkow | 987.89 mi (1,589.85 km) |
| Morriston to Pabianice | 995.39 mi (1,601.93 km) |
