| Glenn Dale to Opole | 4,388.76 mi (7,063.03 km) |
| Glenn Dale to Orzesze | 4,437.85 mi (7,142.03 km) |
| Glenn Dale to Osowa | 4,280.88 mi (6,889.42 km) |
| Glenn Dale to Ostroda | 4,358.39 mi (7,014.15 km) |
| Glenn Dale to Ostroleka | 4,437.42 mi (7,141.34 km) |
| Glenn Dale to Ostrow Mazowiecka | 4,458.89 mi (7,175.88 km) |
| Glenn Dale to Ostrow Wielkopolski | 4,350.61 mi (7,001.63 km) |
| Glenn Dale to Ostrowiec Swietokrzyski | 4,508.90 mi (7,256.38 km) |
| Glenn Dale to Ostrzeszow | 4,362.93 mi (7,021.45 km) |
| Glenn Dale to Oswiecim | 4,459.74 mi (7,177.26 km) |
| Glenn Dale to Otwock | 4,460.92 mi (7,179.16 km) |
| Glenn Dale to Ozarow Mazowiecki | 4,440.44 mi (7,146.19 km) |
| Glenn Dale to Ozimek | 4,399.13 mi (7,079.72 km) |
| Glenn Dale to Ozorkow | 4,393.96 mi (7,071.39 km) |
| Glenn Dale to Pabianice | 4,408.73 mi (7,095.16 km) |
