| Diamond Bar to Octeville | 5,465.12 mi (8,795.26 km) |
| Diamond Bar to Oignies | 5,578.19 mi (8,977.23 km) |
| Diamond Bar to Oissel | 5,569.87 mi (8,963.84 km) |
| Diamond Bar to Olivet | 5,666.55 mi (9,119.44 km) |
| Diamond Bar to Ollioules | 6,032.16 mi (9,707.82 km) |
| Diamond Bar to Olonne-sur-Mer | 5,600.43 mi (9,013.02 km) |
| Diamond Bar to Oloron-Sainte-Marie | 5,796.45 mi (9,328.49 km) |
| Diamond Bar to Onet Village | 5,857.66 mi (9,427.00 km) |
| Diamond Bar to Onnaing | 5,601.23 mi (9,014.31 km) |
| Diamond Bar to Orange | 5,946.50 mi (9,569.96 km) |
| Diamond Bar to Orchies | 5,585.87 mi (8,989.59 km) |
| Diamond Bar to Orleans | 5,665.01 mi (9,116.95 km) |
| Diamond Bar to Orly | 5,641.13 mi (9,078.52 km) |
| Diamond Bar to Ormesson-sur-Marne | 5,643.93 mi (9,083.02 km) |
| Diamond Bar to Orsay | 5,636.53 mi (9,071.11 km) |
