| Cassino to Olympia Heights (Florida) | 5,264.99 mi (8,473.19 km) |
| Cassino to Omaha (Nebraska) | 5,236.47 mi (8,427.28 km) |
| Cassino to On Top of the World Designated Place (Florida) | 5,207.66 mi (8,380.93 km) |
| Cassino to Onalaska (Wisconsin) | 4,931.88 mi (7,937.09 km) |
| Cassino to Oneida (New York) | 4,337.84 mi (6,981.07 km) |
| Cassino to Oneonta (New York) | 4,335.55 mi (6,977.40 km) |
| Cassino to Ontario (California) | 6,376.16 mi (10,261.43 km) |
| Cassino to Ontario (Oregon) | 5,787.77 mi (9,314.51 km) |
| Cassino to Opa-locka (Florida) | 5,253.23 mi (8,454.26 km) |
| Cassino to Opelika (Alabama) | 5,190.78 mi (8,353.75 km) |
| Cassino to Opelousas (Louisiana) | 5,583.67 mi (8,986.05 km) |
| Cassino to Orange (California) | 6,396.55 mi (10,294.26 km) |
| Cassino to Orange (Texas) | 5,675.44 mi (9,133.74 km) |
| Cassino to Orange City (Florida) | 5,168.65 mi (8,318.14 km) |
| Cassino to Orangeburg (South Carolina) | 4,951.99 mi (7,969.46 km) |
