| Castagneto Carducci to Oakley (California) | 6,082.56 mi (9,788.93 km) |
| Castagneto Carducci to Oakton (Virginia) | 4,369.32 mi (7,031.74 km) |
| Castagneto Carducci to Oakville (Missouri) | 4,940.69 mi (7,951.28 km) |
| Castagneto Carducci to Oatfield (Oregon) | 5,675.30 mi (9,133.51 km) |
| Castagneto Carducci to Ocala (Florida) | 4,999.90 mi (8,046.56 km) |
| Castagneto Carducci to Ocean Acres (New Jersey) | 4,202.80 mi (6,763.75 km) |
| Castagneto Carducci to Ocean City (New Jersey) | 4,235.32 mi (6,816.08 km) |
| Castagneto Carducci to Ocean Pines (Maryland) | 4,294.03 mi (6,910.58 km) |
| Castagneto Carducci to Ocean Pointe (Hawaii) | 7,923.27 mi (12,751.27 km) |
| Castagneto Carducci to Ocean Springs (Mississippi) | 5,243.89 mi (8,439.22 km) |
| Castagneto Carducci to Oceanside (California) | 6,218.47 mi (10,007.67 km) |
| Castagneto Carducci to Oceanside (New York) | 4,140.60 mi (6,663.65 km) |
| Castagneto Carducci to Ocoee (Florida) | 4,997.95 mi (8,043.43 km) |
| Castagneto Carducci to Oconomowoc (Wisconsin) | 4,661.33 mi (7,501.69 km) |
| Castagneto Carducci to Odenton (Maryland) | 4,335.56 mi (6,977.42 km) |
