| Seaford to Olympia Heights (Florida) | 4,455.04 mi (7,169.70 km) |
| Seaford to Omaha (Nebraska) | 4,326.52 mi (6,962.86 km) |
| Seaford to On Top of the World Designated Place (Florida) | 4,370.59 mi (7,033.78 km) |
| Seaford to Onalaska (Wisconsin) | 4,022.87 mi (6,474.18 km) |
| Seaford to Oneida (New York) | 3,455.32 mi (5,560.80 km) |
| Seaford to Oneonta (New York) | 3,457.02 mi (5,563.54 km) |
| Seaford to Ontario (California) | 5,461.89 mi (8,790.06 km) |
| Seaford to Ontario (Oregon) | 4,881.35 mi (7,855.77 km) |
| Seaford to Opa-locka (Florida) | 4,442.67 mi (7,149.79 km) |
| Seaford to Opelika (Alabama) | 4,326.02 mi (6,962.06 km) |
| Seaford to Opelousas (Louisiana) | 4,706.48 mi (7,574.34 km) |
| Seaford to Orange (California) | 5,482.29 mi (8,822.90 km) |
| Seaford to Orange (Texas) | 4,794.79 mi (7,716.47 km) |
| Seaford to Orange City (Florida) | 4,336.61 mi (6,979.10 km) |
| Seaford to Orangeburg (South Carolina) | 4,098.52 mi (6,595.93 km) |
