| Amposta to Olympia Heights (Florida) | 4,628.66 mi (7,449.10 km) |
| Amposta to Omaha (Nebraska) | 4,742.10 mi (7,631.67 km) |
| Amposta to On Top of the World Designated Place (Florida) | 4,591.47 mi (7,389.25 km) |
| Amposta to Onalaska (Wisconsin) | 4,436.28 mi (7,139.50 km) |
| Amposta to Oneida (New York) | 3,782.91 mi (6,088.01 km) |
| Amposta to Oneonta (New York) | 3,774.32 mi (6,074.18 km) |
| Amposta to Ontario (California) | 5,947.41 mi (9,571.44 km) |
| Amposta to Ontario (Oregon) | 5,416.63 mi (8,717.22 km) |
| Amposta to Opa-locka (Florida) | 4,617.36 mi (7,430.93 km) |
| Amposta to Opelika (Alabama) | 4,602.34 mi (7,406.75 km) |
| Amposta to Opelousas (Louisiana) | 5,008.24 mi (8,059.98 km) |
| Amposta to Orange (California) | 5,967.77 mi (9,604.20 km) |
| Amposta to Orange (Texas) | 5,104.43 mi (8,214.79 km) |
| Amposta to Orange City (Florida) | 4,548.65 mi (7,320.34 km) |
| Amposta to Orangeburg (South Carolina) | 4,353.14 mi (7,005.70 km) |
