| North Highlands to Olympia Heights (Florida) | 2,535.70 mi (4,080.82 km) |
| North Highlands to Omaha (Nebraska) | 1,347.80 mi (2,169.07 km) |
| North Highlands to On Top of the World Designated Place (Florida) | 2,317.86 mi (3,730.24 km) |
| North Highlands to Onalaska (Wisconsin) | 1,597.65 mi (2,571.18 km) |
| North Highlands to Oneida (New York) | 2,377.71 mi (3,826.55 km) |
| North Highlands to Oneonta (New York) | 2,414.36 mi (3,885.54 km) |
| North Highlands to Ontario (California) | 382.45 mi (615.49 km) |
| North Highlands to Ontario (Oregon) | 434.43 mi (699.15 km) |
| North Highlands to Opa-locka (Florida) | 2,533.95 mi (4,078.00 km) |
| North Highlands to Opelika (Alabama) | 2,049.09 mi (3,297.69 km) |
| North Highlands to Opelousas (Louisiana) | 1,749.51 mi (2,815.56 km) |
| North Highlands to Orange (California) | 390.11 mi (627.82 km) |
| North Highlands to Orange (Texas) | 1,673.41 mi (2,693.09 km) |
| North Highlands to Orange City (Florida) | 2,376.95 mi (3,825.33 km) |
| North Highlands to Orangeburg (South Carolina) | 2,271.27 mi (3,655.25 km) |
