| Trets to Olympia Heights (Florida) | 4,828.93 mi (7,771.41 km) |
| Trets to Omaha (Nebraska) | 4,834.49 mi (7,780.36 km) |
| Trets to On Top of the World Designated Place (Florida) | 4,773.46 mi (7,682.14 km) |
| Trets to Onalaska (Wisconsin) | 4,528.89 mi (7,288.54 km) |
| Trets to Oneida (New York) | 3,915.58 mi (6,301.51 km) |
| Trets to Oneonta (New York) | 3,911.66 mi (6,295.21 km) |
| Trets to Ontario (California) | 6,001.72 mi (9,658.83 km) |
| Trets to Ontario (Oregon) | 5,436.60 mi (8,749.37 km) |
| Trets to Opa-locka (Florida) | 4,817.19 mi (7,752.52 km) |
| Trets to Opelika (Alabama) | 4,761.42 mi (7,662.77 km) |
| Trets to Opelousas (Louisiana) | 5,157.62 mi (8,300.38 km) |
| Trets to Orange (California) | 6,022.14 mi (9,691.70 km) |
| Trets to Orange (Texas) | 5,250.57 mi (8,449.98 km) |
| Trets to Orange City (Florida) | 4,733.95 mi (7,618.55 km) |
| Trets to Orangeburg (South Carolina) | 4,520.40 mi (7,274.89 km) |
