| Diamond Bar to Oberkirch | 5,833.34 mi (9,387.85 km) |
| Diamond Bar to Obernburg am Main | 5,798.39 mi (9,331.61 km) |
| Diamond Bar to Obernkirchen | 5,672.89 mi (9,129.63 km) |
| Diamond Bar to Oberschleissheim | 5,953.32 mi (9,580.95 km) |
| Diamond Bar to Oberstdorf | 5,958.84 mi (9,589.82 km) |
| Diamond Bar to Obertraubling | 5,932.84 mi (9,547.99 km) |
| Diamond Bar to Obertshausen | 5,777.59 mi (9,298.13 km) |
| Diamond Bar to Oberursel | 5,762.97 mi (9,274.61 km) |
| Diamond Bar to Ochsenfurt | 5,835.58 mi (9,391.45 km) |
| Diamond Bar to Ochsenhausen | 5,914.19 mi (9,517.96 km) |
| Diamond Bar to Ochtrup | 5,620.68 mi (9,045.61 km) |
| Diamond Bar to Odenthal | 5,677.41 mi (9,136.91 km) |
| Diamond Bar to Oelde | 5,667.32 mi (9,120.68 km) |
| Diamond Bar to Oelsnitz | 5,855.59 mi (9,423.66 km) |
| Diamond Bar to Oer-Erkenschwick | 5,650.76 mi (9,094.02 km) |
