| Serpa to Opole | 1,525.82 mi (2,455.57 km) |
| Serpa to Orzesze | 1,544.04 mi (2,484.89 km) |
| Serpa to Osowa | 1,670.98 mi (2,689.17 km) |
| Serpa to Ostroda | 1,697.83 mi (2,732.39 km) |
| Serpa to Ostroleka | 1,736.80 mi (2,795.12 km) |
| Serpa to Ostrow Mazowiecka | 1,741.70 mi (2,803.00 km) |
| Serpa to Ostrow Wielkopolski | 1,551.54 mi (2,496.96 km) |
| Serpa to Ostrowiec Swietokrzyski | 1,672.20 mi (2,691.14 km) |
| Serpa to Ostrzeszow | 1,548.64 mi (2,492.29 km) |
| Serpa to Oswiecim | 1,560.37 mi (2,511.17 km) |
| Serpa to Otwock | 1,698.14 mi (2,732.89 km) |
| Serpa to Ozarow Mazowiecki | 1,682.92 mi (2,708.40 km) |
| Serpa to Ozimek | 1,537.10 mi (2,473.73 km) |
| Serpa to Ozorkow | 1,617.35 mi (2,602.87 km) |
| Serpa to Pabianice | 1,611.68 mi (2,593.75 km) |
