| Mountain Ash to Opole | 922.58 mi (1,484.75 km) |
| Mountain Ash to Orzesze | 965.99 mi (1,554.61 km) |
| Mountain Ash to Osowa | 923.04 mi (1,485.49 km) |
| Mountain Ash to Ostroda | 983.03 mi (1,582.03 km) |
| Mountain Ash to Ostroleka | 1,051.23 mi (1,691.79 km) |
| Mountain Ash to Ostrow Mazowiecka | 1,066.79 mi (1,716.82 km) |
| Mountain Ash to Ostrow Wielkopolski | 905.15 mi (1,456.69 km) |
| Mountain Ash to Ostrowiec Swietokrzyski | 1,066.39 mi (1,716.19 km) |
| Mountain Ash to Ostrzeszow | 912.62 mi (1,468.73 km) |
| Mountain Ash to Oswiecim | 988.18 mi (1,590.32 km) |
| Mountain Ash to Otwock | 1,046.12 mi (1,683.58 km) |
| Mountain Ash to Ozarow Mazowiecki | 1,025.59 mi (1,650.53 km) |
| Mountain Ash to Ozimek | 934.44 mi (1,503.83 km) |
| Mountain Ash to Ozorkow | 964.08 mi (1,551.54 km) |
| Mountain Ash to Pabianice | 971.52 mi (1,563.52 km) |
