| Diamond Bar to Oerlinghausen | 5,675.40 mi (9,133.67 km) |
| Diamond Bar to Oestrich-Winkel | 5,756.10 mi (9,263.55 km) |
| Diamond Bar to Offenburg | 5,832.09 mi (9,385.85 km) |
| Diamond Bar to Oftersheim | 5,805.85 mi (9,343.61 km) |
| Diamond Bar to Ohrdruf | 5,793.33 mi (9,323.46 km) |
| Diamond Bar to Ohringen | 5,842.13 mi (9,402.00 km) |
| Diamond Bar to Olbernhau | 5,874.60 mi (9,454.25 km) |
| Diamond Bar to Olching | 5,948.56 mi (9,573.29 km) |
| Diamond Bar to Oldenburg | 5,602.59 mi (9,016.50 km) |
| Diamond Bar to Oldenburg in Holstein | 5,615.83 mi (9,037.80 km) |
| Diamond Bar to Olfen | 5,650.90 mi (9,094.25 km) |
| Diamond Bar to Olpe | 5,699.51 mi (9,172.48 km) |
| Diamond Bar to Olsberg | 5,701.61 mi (9,175.85 km) |
| Diamond Bar to Oranienburg | 5,759.75 mi (9,269.42 km) |
| Diamond Bar to Ortenberg | 5,769.29 mi (9,284.78 km) |
