| Diamond Bar to Nuth | 5,646.12 mi (9,086.55 km) |
| Diamond Bar to Oegstgeest | 5,541.13 mi (8,917.59 km) |
| Diamond Bar to Oirschot | 5,599.67 mi (9,011.79 km) |
| Diamond Bar to Oisterwijk | 5,592.55 mi (9,000.34 km) |
| Diamond Bar to Oldebroek | 5,570.75 mi (8,965.26 km) |
| Diamond Bar to Oldenzaal | 5,607.63 mi (9,024.61 km) |
| Diamond Bar to Ommen | 5,582.59 mi (8,984.31 km) |
| Diamond Bar to Oosterend | 5,548.25 mi (8,929.04 km) |
| Diamond Bar to Oosterhout | 5,579.24 mi (8,978.92 km) |
| Diamond Bar to Oosterwolde | 5,555.43 mi (8,940.60 km) |
| Diamond Bar to Oostzaan | 5,541.45 mi (8,918.10 km) |
| Diamond Bar to Opmeer | 5,530.42 mi (8,900.34 km) |
| Diamond Bar to Oss | 5,593.07 mi (9,001.18 km) |
| Diamond Bar to Oud-Beijerland | 5,556.92 mi (8,942.99 km) |
| Diamond Bar to Oudenbosch | 5,571.74 mi (8,966.86 km) |
