| Herndon to Opole | 4,411.46 mi (7,099.56 km) |
| Herndon to Orzesze | 4,460.63 mi (7,178.68 km) |
| Herndon to Osowa | 4,302.09 mi (6,923.54 km) |
| Herndon to Ostroda | 4,379.68 mi (7,048.41 km) |
| Herndon to Ostroleka | 4,458.74 mi (7,175.64 km) |
| Herndon to Ostrow Mazowiecka | 4,480.26 mi (7,210.28 km) |
| Herndon to Ostrow Wielkopolski | 4,372.97 mi (7,037.61 km) |
| Herndon to Ostrowiec Swietokrzyski | 4,531.03 mi (7,291.99 km) |
| Herndon to Ostrzeszow | 4,385.36 mi (7,057.55 km) |
| Herndon to Oswiecim | 4,482.50 mi (7,213.88 km) |
| Herndon to Otwock | 4,482.64 mi (7,214.11 km) |
| Herndon to Ozarow Mazowiecki | 4,462.18 mi (7,181.19 km) |
| Herndon to Ozimek | 4,421.80 mi (7,116.19 km) |
| Herndon to Ozorkow | 4,416.00 mi (7,106.87 km) |
| Herndon to Pabianice | 4,430.88 mi (7,130.81 km) |
