| Clarksburg to Opole | 4,394.40 mi (7,072.11 km) |
| Clarksburg to Orzesze | 4,443.59 mi (7,151.27 km) |
| Clarksburg to Osowa | 4,284.54 mi (6,895.31 km) |
| Clarksburg to Ostroda | 4,362.16 mi (7,020.22 km) |
| Clarksburg to Ostroleka | 4,441.23 mi (7,147.46 km) |
| Clarksburg to Ostrow Mazowiecka | 4,462.76 mi (7,182.12 km) |
| Clarksburg to Ostrow Wielkopolski | 4,355.78 mi (7,009.96 km) |
| Clarksburg to Ostrowiec Swietokrzyski | 4,513.77 mi (7,264.21 km) |
| Clarksburg to Ostrzeszow | 4,368.20 mi (7,029.94 km) |
| Clarksburg to Oswiecim | 4,465.46 mi (7,186.46 km) |
| Clarksburg to Otwock | 4,465.24 mi (7,186.12 km) |
| Clarksburg to Ozarow Mazowiecki | 4,444.80 mi (7,153.21 km) |
| Clarksburg to Ozimek | 4,404.72 mi (7,088.72 km) |
| Clarksburg to Ozorkow | 4,398.72 mi (7,079.05 km) |
| Clarksburg to Pabianice | 4,413.62 mi (7,103.04 km) |
