| San Pietro in Casale to Odessa (Texas) | 5,708.47 mi (9,186.90 km) |
| San Pietro in Casale to Ogden (Utah) | 5,543.96 mi (8,922.14 km) |
| San Pietro in Casale to Oildale (California) | 6,091.13 mi (9,802.73 km) |
| San Pietro in Casale to Ojus (Florida) | 5,051.72 mi (8,129.96 km) |
| San Pietro in Casale to Okemos (Michigan) | 4,484.34 mi (7,216.84 km) |
| San Pietro in Casale to Oklahoma City (Oklahoma) | 5,338.29 mi (8,591.15 km) |
| San Pietro in Casale to Okmulgee (Oklahoma) | 5,272.27 mi (8,484.89 km) |
| San Pietro in Casale to Olathe (Kansas) | 5,066.06 mi (8,153.03 km) |
| San Pietro in Casale to Old Jamestown (Missouri) | 4,891.25 mi (7,871.71 km) |
| San Pietro in Casale to Oldsmar (Florida) | 5,069.12 mi (8,157.96 km) |
| San Pietro in Casale to Olean (New York) | 4,268.15 mi (6,868.92 km) |
| San Pietro in Casale to Olive Branch (Mississippi) | 5,055.93 mi (8,136.73 km) |
| San Pietro in Casale to Olivehurst (California) | 5,951.31 mi (9,577.71 km) |
| San Pietro in Casale to Olney (Maryland) | 4,331.65 mi (6,971.12 km) |
| San Pietro in Casale to Olympia (Washington) | 5,515.99 mi (8,877.13 km) |
