| Diamond Bar to Odessa (Texas) | 908.08 mi (1,461.41 km) |
| Diamond Bar to Ogden (Utah) | 592.86 mi (954.12 km) |
| Diamond Bar to Oildale (California) | 120.50 mi (193.93 km) |
| Diamond Bar to Ojus (Florida) | 2,307.40 mi (3,713.40 km) |
| Diamond Bar to Okemos (Michigan) | 1,892.88 mi (3,046.30 km) |
| Diamond Bar to Oklahoma City (Oklahoma) | 1,155.22 mi (1,859.15 km) |
| Diamond Bar to Okmulgee (Oklahoma) | 1,239.75 mi (1,995.18 km) |
| Diamond Bar to Olathe (Kansas) | 1,318.05 mi (2,121.19 km) |
| Diamond Bar to Old Jamestown (Missouri) | 1,560.50 mi (2,511.39 km) |
| Diamond Bar to Oldsmar (Florida) | 2,110.51 mi (3,396.55 km) |
| Diamond Bar to Olean (New York) | 2,193.83 mi (3,530.63 km) |
| Diamond Bar to Olive Branch (Mississippi) | 1,589.19 mi (2,557.55 km) |
| Diamond Bar to Olivehurst (California) | 407.74 mi (656.19 km) |
| Diamond Bar to Olney (Maryland) | 2,269.43 mi (3,652.30 km) |
| Diamond Bar to Olympia (Washington) | 939.28 mi (1,511.63 km) |
