| Castagneto Carducci to Orangevale (California) | 6,028.26 mi (9,701.55 km) |
| Castagneto Carducci to Orchards (Washington) | 5,657.53 mi (9,104.92 km) |
| Castagneto Carducci to Orcutt (California) | 6,224.95 mi (10,018.09 km) |
| Castagneto Carducci to Oregon (Ohio) | 4,518.38 mi (7,271.63 km) |
| Castagneto Carducci to Oregon (Wisconsin) | 4,704.02 mi (7,570.39 km) |
| Castagneto Carducci to Oregon City (Oregon) | 5,679.38 mi (9,140.07 km) |
| Castagneto Carducci to Orem (Utah) | 5,641.46 mi (9,079.05 km) |
| Castagneto Carducci to Orinda (California) | 6,103.26 mi (9,822.26 km) |
| Castagneto Carducci to Orland Park (Illinois) | 4,700.83 mi (7,565.26 km) |
| Castagneto Carducci to Orlando (Florida) | 4,993.39 mi (8,036.09 km) |
| Castagneto Carducci to Ormond Beach (Florida) | 4,946.05 mi (7,959.89 km) |
| Castagneto Carducci to Oro Valley (Arizona) | 6,042.63 mi (9,724.67 km) |
| Castagneto Carducci to Oroville (California) | 5,991.12 mi (9,641.78 km) |
| Castagneto Carducci to Oshkosh (Wisconsin) | 4,624.14 mi (7,441.83 km) |
| Castagneto Carducci to Oskaloosa (Iowa) | 4,904.08 mi (7,892.35 km) |
