| Walla Walla to Opwijk | 4,910.09 mi (7,902.03 km) |
| Walla Walla to Ostend | 4,861.88 mi (7,824.44 km) |
| Walla Walla to Oud-Heverlee | 4,930.33 mi (7,934.61 km) |
| Walla Walla to Oud-Turnhout | 4,912.39 mi (7,905.73 km) |
| Walla Walla to Oudenaarde | 4,900.64 mi (7,886.82 km) |
| Walla Walla to Oudenburg | 4,866.36 mi (7,831.64 km) |
| Walla Walla to Oupeye | 4,963.20 mi (7,987.49 km) |
| Walla Walla to Overijse | 4,929.48 mi (7,933.23 km) |
| Walla Walla to Overpelt | 4,929.30 mi (7,932.95 km) |
| Walla Walla to Paal | 4,932.58 mi (7,938.22 km) |
| Walla Walla to Peer | 4,934.88 mi (7,941.92 km) |
| Walla Walla to Pepinster | 4,975.59 mi (8,007.44 km) |
| Walla Walla to Peruwelz | 4,918.21 mi (7,915.09 km) |
| Walla Walla to Perwez | 4,945.73 mi (7,959.38 km) |
| Walla Walla to Philippeville | 4,961.74 mi (7,985.14 km) |
