| Walla Walla to Oerlinghausen | 4,970.83 mi (7,999.79 km) |
| Walla Walla to Oestrich-Winkel | 5,064.32 mi (8,150.23 km) |
| Walla Walla to Offenburg | 5,148.72 mi (8,286.06 km) |
| Walla Walla to Oftersheim | 5,114.90 mi (8,231.63 km) |
| Walla Walla to Ohrdruf | 5,086.31 mi (8,185.62 km) |
| Walla Walla to Ohringen | 5,148.19 mi (8,285.21 km) |
| Walla Walla to Olbernhau | 5,158.09 mi (8,301.15 km) |
| Walla Walla to Olching | 5,251.80 mi (8,451.96 km) |
| Walla Walla to Oldenburg | 4,893.80 mi (7,875.81 km) |
| Walla Walla to Oldenburg in Holstein | 4,891.98 mi (7,872.88 km) |
| Walla Walla to Olfen | 4,952.59 mi (7,970.42 km) |
| Walla Walla to Olpe | 5,003.08 mi (8,051.68 km) |
| Walla Walla to Olsberg | 5,000.88 mi (8,048.14 km) |
| Walla Walla to Oranienburg | 5,034.48 mi (8,102.21 km) |
| Walla Walla to Ortenberg | 5,071.33 mi (8,161.52 km) |
