| San Pietro in Casale to Orangevale (California) | 5,964.93 mi (9,599.62 km) |
| San Pietro in Casale to Orchards (Washington) | 5,586.94 mi (8,991.31 km) |
| San Pietro in Casale to Orcutt (California) | 6,165.92 mi (9,923.10 km) |
| San Pietro in Casale to Oregon (Ohio) | 4,490.51 mi (7,226.78 km) |
| San Pietro in Casale to Oregon (Wisconsin) | 4,668.39 mi (7,513.05 km) |
| San Pietro in Casale to Oregon City (Oregon) | 5,609.01 mi (9,026.83 km) |
| San Pietro in Casale to Orem (Utah) | 5,586.74 mi (8,990.99 km) |
| San Pietro in Casale to Orinda (California) | 6,039.59 mi (9,719.78 km) |
| San Pietro in Casale to Orland Park (Illinois) | 4,668.73 mi (7,513.60 km) |
| San Pietro in Casale to Orlando (Florida) | 4,989.14 mi (8,029.24 km) |
| San Pietro in Casale to Ormond Beach (Florida) | 4,940.78 mi (7,951.41 km) |
| San Pietro in Casale to Oro Valley (Arizona) | 5,997.31 mi (9,651.74 km) |
| San Pietro in Casale to Oroville (California) | 5,926.72 mi (9,538.13 km) |
| San Pietro in Casale to Oshkosh (Wisconsin) | 4,587.57 mi (7,382.98 km) |
| San Pietro in Casale to Oskaloosa (Iowa) | 4,867.73 mi (7,833.86 km) |
