| Manassas to Oerlinghausen | 4,029.18 mi (6,484.34 km) |
| Manassas to Oestrich-Winkel | 4,058.47 mi (6,531.48 km) |
| Manassas to Offenburg | 4,100.44 mi (6,599.03 km) |
| Manassas to Oftersheim | 4,100.49 mi (6,599.10 km) |
| Manassas to Ohrdruf | 4,143.04 mi (6,667.58 km) |
| Manassas to Ohringen | 4,142.79 mi (6,667.18 km) |
| Manassas to Olbernhau | 4,249.67 mi (6,839.18 km) |
| Manassas to Olching | 4,247.83 mi (6,836.22 km) |
| Manassas to Oldenburg | 3,979.43 mi (6,404.28 km) |
| Manassas to Oldenburg in Holstein | 4,047.76 mi (6,514.25 km) |
| Manassas to Olfen | 3,985.85 mi (6,414.61 km) |
| Manassas to Olpe | 4,022.97 mi (6,474.34 km) |
| Manassas to Olsberg | 4,039.32 mi (6,500.66 km) |
| Manassas to Oranienburg | 4,180.68 mi (6,728.16 km) |
| Manassas to Ortenberg | 4,090.56 mi (6,583.13 km) |
