| Sunset to Olympia (Washington) | 2,740.30 mi (4,410.08 km) |
| Sunset to Olympia Heights (Florida) | 1.53 mi (2.46 km) |
| Sunset to Omaha (Nebraska) | 1,400.22 mi (2,253.43 km) |
| Sunset to On Top of the World Designated Place (Florida) | 263.13 mi (423.47 km) |
| Sunset to Onalaska (Wisconsin) | 1,396.17 mi (2,246.92 km) |
| Sunset to Oneida (New York) | 1,229.11 mi (1,978.06 km) |
| Sunset to Oneonta (New York) | 1,195.48 mi (1,923.94 km) |
| Sunset to Ontario (California) | 2,291.46 mi (3,687.75 km) |
| Sunset to Ontario (Oregon) | 2,402.61 mi (3,866.63 km) |
| Sunset to Opa-locka (Florida) | 14.70 mi (23.66 km) |
| Sunset to Opelika (Alabama) | 567.93 mi (914.00 km) |
| Sunset to Opelousas (Louisiana) | 787.89 mi (1,267.99 km) |
| Sunset to Orange (California) | 2,302.60 mi (3,705.68 km) |
| Sunset to Orange (Texas) | 872.89 mi (1,404.78 km) |
| Sunset to Orange City (Florida) | 230.35 mi (370.72 km) |
