| Marchena to Olympia Heights (Florida) | 4,372.54 mi (7,036.92 km) |
| Marchena to Omaha (Nebraska) | 4,618.09 mi (7,432.09 km) |
| Marchena to On Top of the World Designated Place (Florida) | 4,358.14 mi (7,013.75 km) |
| Marchena to Onalaska (Wisconsin) | 4,315.05 mi (6,944.39 km) |
| Marchena to Oneida (New York) | 3,618.75 mi (5,823.81 km) |
| Marchena to Oneonta (New York) | 3,604.35 mi (5,800.63 km) |
| Marchena to Ontario (California) | 5,859.14 mi (9,429.37 km) |
| Marchena to Ontario (Oregon) | 5,375.20 mi (8,650.54 km) |
| Marchena to Opa-locka (Florida) | 4,361.87 mi (7,019.74 km) |
| Marchena to Opelika (Alabama) | 4,397.23 mi (7,076.65 km) |
| Marchena to Opelousas (Louisiana) | 4,811.85 mi (7,743.92 km) |
| Marchena to Orange (California) | 5,879.23 mi (9,461.71 km) |
| Marchena to Orange (Texas) | 4,911.25 mi (7,903.90 km) |
| Marchena to Orange City (Florida) | 4,311.54 mi (6,938.75 km) |
| Marchena to Orangeburg (South Carolina) | 4,139.93 mi (6,662.57 km) |
