| Clay to Opole | 5,025.93 mi (8,088.46 km) |
| Clay to Orzesze | 5,075.51 mi (8,168.24 km) |
| Clay to Osowa | 4,906.67 mi (7,896.52 km) |
| Clay to Ostroda | 4,984.82 mi (8,022.28 km) |
| Clay to Ostroleka | 5,063.95 mi (8,149.64 km) |
| Clay to Ostrow Mazowiecka | 5,085.83 mi (8,184.85 km) |
| Clay to Ostrow Wielkopolski | 4,985.33 mi (8,023.12 km) |
| Clay to Ostrowiec Swietokrzyski | 5,141.76 mi (8,274.87 km) |
| Clay to Ostrzeszow | 4,998.16 mi (8,043.76 km) |
| Clay to Oswiecim | 5,097.21 mi (8,203.17 km) |
| Clay to Otwock | 5,090.63 mi (8,192.58 km) |
| Clay to Ozarow Mazowiecki | 5,070.39 mi (8,160.01 km) |
| Clay to Ozimek | 5,036.02 mi (8,104.69 km) |
| Clay to Ozorkow | 5,026.30 mi (8,089.04 km) |
| Clay to Pabianice | 5,041.84 mi (8,114.06 km) |
