| Diamond Bar to Opwijk | 5,591.53 mi (8,998.69 km) |
| Diamond Bar to Ostend | 5,539.70 mi (8,915.29 km) |
| Diamond Bar to Oud-Heverlee | 5,612.97 mi (9,033.20 km) |
| Diamond Bar to Oud-Turnhout | 5,599.05 mi (9,010.79 km) |
| Diamond Bar to Oudenaarde | 5,579.01 mi (8,978.55 km) |
| Diamond Bar to Oudenburg | 5,544.25 mi (8,922.62 km) |
| Diamond Bar to Oupeye | 5,649.11 mi (9,091.37 km) |
| Diamond Bar to Overijse | 5,611.28 mi (9,030.49 km) |
| Diamond Bar to Overpelt | 5,617.14 mi (9,039.91 km) |
| Diamond Bar to Paal | 5,618.44 mi (9,042.00 km) |
| Diamond Bar to Peer | 5,622.39 mi (9,048.36 km) |
| Diamond Bar to Pepinster | 5,661.43 mi (9,111.19 km) |
| Diamond Bar to Peruwelz | 5,594.55 mi (9,003.56 km) |
| Diamond Bar to Perwez | 5,627.78 mi (9,057.04 km) |
| Diamond Bar to Philippeville | 5,640.26 mi (9,077.12 km) |
