| Glenn Dale to Nuth | 3,909.64 mi (6,291.96 km) |
| Glenn Dale to Oegstgeest | 3,820.75 mi (6,148.90 km) |
| Glenn Dale to Oirschot | 3,871.05 mi (6,229.86 km) |
| Glenn Dale to Oisterwijk | 3,864.93 mi (6,220.00 km) |
| Glenn Dale to Oldebroek | 3,870.51 mi (6,228.99 km) |
| Glenn Dale to Oldenzaal | 3,914.37 mi (6,299.57 km) |
| Glenn Dale to Ommen | 3,889.00 mi (6,258.75 km) |
| Glenn Dale to Oosterend | 3,862.99 mi (6,216.89 km) |
| Glenn Dale to Oosterhout | 3,849.72 mi (6,195.53 km) |
| Glenn Dale to Oosterwolde | 3,872.04 mi (6,231.44 km) |
| Glenn Dale to Oostzaan | 3,831.03 mi (6,165.45 km) |
| Glenn Dale to Opmeer | 3,827.08 mi (6,159.09 km) |
| Glenn Dale to Oss | 3,872.84 mi (6,232.74 km) |
| Glenn Dale to Oud-Beijerland | 3,827.15 mi (6,159.21 km) |
| Glenn Dale to Oudenbosch | 3,837.77 mi (6,176.30 km) |
