| Loudoun Valley Estates to Oerlinghausen | 4,019.08 mi (6,468.09 km) |
| Loudoun Valley Estates to Oestrich-Winkel | 4,048.87 mi (6,516.03 km) |
| Loudoun Valley Estates to Offenburg | 4,091.21 mi (6,584.17 km) |
| Loudoun Valley Estates to Oftersheim | 4,091.00 mi (6,583.83 km) |
| Loudoun Valley Estates to Ohrdruf | 4,133.07 mi (6,651.53 km) |
| Loudoun Valley Estates to Ohringen | 4,133.27 mi (6,651.86 km) |
| Loudoun Valley Estates to Olbernhau | 4,239.55 mi (6,822.89 km) |
| Loudoun Valley Estates to Olching | 4,238.40 mi (6,821.04 km) |
| Loudoun Valley Estates to Oldenburg | 3,969.09 mi (6,387.63 km) |
| Loudoun Valley Estates to Oldenburg in Holstein | 4,037.01 mi (6,496.94 km) |
| Loudoun Valley Estates to Olfen | 3,975.89 mi (6,398.58 km) |
| Loudoun Valley Estates to Olpe | 4,013.14 mi (6,458.53 km) |
| Loudoun Valley Estates to Olsberg | 4,029.38 mi (6,484.66 km) |
| Loudoun Valley Estates to Oranienburg | 4,170.12 mi (6,711.16 km) |
| Loudoun Valley Estates to Ortenberg | 4,080.81 mi (6,567.43 km) |
