| Grosseto to Olympia Heights (Florida) | 5,102.71 mi (8,212.03 km) |
| Grosseto to Omaha (Nebraska) | 5,074.00 mi (8,165.82 km) |
| Grosseto to On Top of the World Designated Place (Florida) | 5,043.70 mi (8,117.05 km) |
| Grosseto to Onalaska (Wisconsin) | 4,769.20 mi (7,675.28 km) |
| Grosseto to Oneida (New York) | 4,172.79 mi (6,715.46 km) |
| Grosseto to Oneonta (New York) | 4,170.44 mi (6,711.68 km) |
| Grosseto to Ontario (California) | 6,219.68 mi (10,009.61 km) |
| Grosseto to Ontario (Oregon) | 5,636.85 mi (9,071.64 km) |
| Grosseto to Opa-locka (Florida) | 5,090.91 mi (8,193.02 km) |
| Grosseto to Opelika (Alabama) | 5,025.77 mi (8,088.19 km) |
| Grosseto to Opelousas (Louisiana) | 5,418.54 mi (8,720.29 km) |
| Grosseto to Orange (California) | 6,240.09 mi (10,042.45 km) |
| Grosseto to Orange (Texas) | 5,510.32 mi (8,868.01 km) |
| Grosseto to Orange City (Florida) | 5,004.95 mi (8,054.68 km) |
| Grosseto to Orangeburg (South Carolina) | 4,787.27 mi (7,704.36 km) |
