| Williamstown to Opole | 4,285.18 mi (6,896.33 km) |
| Williamstown to Orzesze | 4,334.15 mi (6,975.14 km) |
| Williamstown to Osowa | 4,179.86 mi (6,726.83 km) |
| Williamstown to Ostroda | 4,257.19 mi (6,851.29 km) |
| Williamstown to Ostroleka | 4,336.18 mi (6,978.40 km) |
| Williamstown to Ostrow Mazowiecka | 4,357.54 mi (7,012.79 km) |
| Williamstown to Ostrow Wielkopolski | 4,247.59 mi (6,835.84 km) |
| Williamstown to Ostrowiec Swietokrzyski | 4,406.26 mi (7,091.18 km) |
| Williamstown to Ostrzeszow | 4,259.79 mi (6,855.48 km) |
| Williamstown to Oswiecim | 4,356.08 mi (7,010.44 km) |
| Williamstown to Otwock | 4,358.98 mi (7,015.10 km) |
| Williamstown to Ozarow Mazowiecki | 4,338.45 mi (6,982.06 km) |
| Williamstown to Ozimek | 4,295.62 mi (6,913.13 km) |
| Williamstown to Ozorkow | 4,291.46 mi (6,906.44 km) |
| Williamstown to Pabianice | 4,306.06 mi (6,929.93 km) |
