| Prato to Olympia Heights (Florida) | 5,075.98 mi (8,169.00 km) |
| Prato to Omaha (Nebraska) | 5,023.03 mi (8,083.79 km) |
| Prato to On Top of the World Designated Place (Florida) | 5,012.17 mi (8,066.31 km) |
| Prato to Onalaska (Wisconsin) | 4,718.68 mi (7,593.98 km) |
| Prato to Oneida (New York) | 4,131.04 mi (6,648.27 km) |
| Prato to Oneonta (New York) | 4,129.69 mi (6,646.09 km) |
| Prato to Ontario (California) | 6,160.85 mi (9,914.94 km) |
| Prato to Ontario (Oregon) | 5,573.66 mi (8,969.94 km) |
| Prato to Opa-locka (Florida) | 5,064.06 mi (8,149.82 km) |
| Prato to Opelika (Alabama) | 4,988.67 mi (8,028.48 km) |
| Prato to Opelousas (Louisiana) | 5,378.73 mi (8,656.22 km) |
| Prato to Orange (California) | 6,181.25 mi (9,947.77 km) |
| Prato to Orange (Texas) | 5,469.68 mi (8,802.59 km) |
| Prato to Orange City (Florida) | 4,974.32 mi (8,005.39 km) |
| Prato to Orangeburg (South Carolina) | 4,752.40 mi (7,648.26 km) |
