| Round Rock to Opole | 5,594.31 mi (9,003.18 km) |
| Round Rock to Orzesze | 5,644.68 mi (9,084.23 km) |
| Round Rock to Osowa | 5,451.87 mi (8,773.94 km) |
| Round Rock to Ostroda | 5,530.62 mi (8,900.67 km) |
| Round Rock to Ostroleka | 5,609.28 mi (9,027.26 km) |
| Round Rock to Ostrow Mazowiecka | 5,631.81 mi (9,063.52 km) |
| Round Rock to Ostrow Wielkopolski | 5,548.50 mi (8,929.44 km) |
| Round Rock to Ostrowiec Swietokrzyski | 5,699.69 mi (9,172.76 km) |
| Round Rock to Ostrzeszow | 5,562.35 mi (8,951.74 km) |
| Round Rock to Oswiecim | 5,665.79 mi (9,118.21 km) |
| Round Rock to Otwock | 5,642.25 mi (9,080.32 km) |
| Round Rock to Ozarow Mazowiecki | 5,622.68 mi (9,048.83 km) |
| Round Rock to Ozimek | 5,603.67 mi (9,018.23 km) |
| Round Rock to Ozorkow | 5,583.96 mi (8,986.52 km) |
| Round Rock to Pabianice | 5,601.05 mi (9,014.02 km) |
