| Castagneto Carducci to Oswego (Illinois) | 4,716.59 mi (7,590.62 km) |
| Castagneto Carducci to Oswego (New York) | 4,158.00 mi (6,691.66 km) |
| Castagneto Carducci to Otsego (Minnesota) | 4,760.99 mi (7,662.07 km) |
| Castagneto Carducci to Ottawa (Illinois) | 4,750.51 mi (7,645.21 km) |
| Castagneto Carducci to Ottawa (Kansas) | 5,132.02 mi (8,259.18 km) |
| Castagneto Carducci to Ottumwa (Iowa) | 4,907.85 mi (7,898.42 km) |
| Castagneto Carducci to Overland (Missouri) | 4,931.43 mi (7,936.37 km) |
| Castagneto Carducci to Overland Park (Kansas) | 5,095.75 mi (8,200.82 km) |
| Castagneto Carducci to Overlea (Maryland) | 4,316.05 mi (6,946.00 km) |
| Castagneto Carducci to Oviedo (Florida) | 4,978.40 mi (8,011.96 km) |
| Castagneto Carducci to Owasso (Oklahoma) | 5,264.66 mi (8,472.65 km) |
| Castagneto Carducci to Owatonna (Minnesota) | 4,799.56 mi (7,724.15 km) |
| Castagneto Carducci to Owensboro (Kentucky) | 4,838.85 mi (7,787.38 km) |
| Castagneto Carducci to Owings Mills (Maryland) | 4,326.18 mi (6,962.32 km) |
| Castagneto Carducci to Owosso (Michigan) | 4,493.26 mi (7,231.21 km) |
