| Diamond Bar to Nyon | 5,883.01 mi (9,467.79 km) |
| Diamond Bar to Oberriet | 5,941.77 mi (9,562.36 km) |
| Diamond Bar to Obersiggenthal | 5,893.29 mi (9,484.33 km) |
| Diamond Bar to Oberwil | 5,868.68 mi (9,444.73 km) |
| Diamond Bar to Oberwingert | 5,906.65 mi (9,505.84 km) |
| Diamond Bar to Oftringen | 5,890.15 mi (9,479.28 km) |
| Diamond Bar to Olten | 5,887.92 mi (9,475.70 km) |
| Diamond Bar to Onex | 5,888.62 mi (9,476.82 km) |
| Diamond Bar to Opfikon | 5,904.64 mi (9,502.60 km) |
| Diamond Bar to Ostermundigen | 5,894.94 mi (9,486.99 km) |
| Diamond Bar to Payerne | 5,884.05 mi (9,469.46 km) |
| Diamond Bar to Pfaffikon | 5,914.83 mi (9,519.00 km) |
| Diamond Bar to Plan-les-Ouates | 5,890.00 mi (9,479.04 km) |
| Diamond Bar to Pratteln | 5,873.12 mi (9,451.87 km) |
| Diamond Bar to Prilly | 5,887.49 mi (9,475.00 km) |
