| Sannicolau Mare to Olympia Heights (Florida) | 5,446.30 mi (8,764.97 km) |
| Sannicolau Mare to Omaha (Nebraska) | 5,255.46 mi (8,457.84 km) |
| Sannicolau Mare to On Top of the World Designated Place (Florida) | 5,360.79 mi (8,627.36 km) |
| Sannicolau Mare to Onalaska (Wisconsin) | 4,956.66 mi (7,976.97 km) |
| Sannicolau Mare to Oneida (New York) | 4,430.53 mi (7,130.25 km) |
| Sannicolau Mare to Oneonta (New York) | 4,434.94 mi (7,137.35 km) |
| Sannicolau Mare to Ontario (California) | 6,320.00 mi (10,171.05 km) |
| Sannicolau Mare to Ontario (Oregon) | 5,693.85 mi (9,163.37 km) |
| Sannicolau Mare to Opa-locka (Florida) | 5,433.95 mi (8,745.09 km) |
| Sannicolau Mare to Opelika (Alabama) | 5,308.95 mi (8,543.94 km) |
| Sannicolau Mare to Opelousas (Louisiana) | 5,681.69 mi (9,143.80 km) |
| Sannicolau Mare to Orange (California) | 6,340.13 mi (10,203.46 km) |
| Sannicolau Mare to Orange (Texas) | 5,767.24 mi (9,281.48 km) |
| Sannicolau Mare to Orange City (Florida) | 5,327.39 mi (8,573.61 km) |
| Sannicolau Mare to Orangeburg (South Carolina) | 5,085.78 mi (8,184.76 km) |
