| Castagneto Carducci to Odessa (Texas) | 5,742.73 mi (9,242.03 km) |
| Castagneto Carducci to Ogden (Utah) | 5,599.95 mi (9,012.25 km) |
| Castagneto Carducci to Oildale (California) | 6,149.07 mi (9,895.97 km) |
| Castagneto Carducci to Ojus (Florida) | 5,050.62 mi (8,128.19 km) |
| Castagneto Carducci to Okemos (Michigan) | 4,514.89 mi (7,266.01 km) |
| Castagneto Carducci to Oklahoma City (Oklahoma) | 5,371.62 mi (8,644.78 km) |
| Castagneto Carducci to Okmulgee (Oklahoma) | 5,304.10 mi (8,536.12 km) |
| Castagneto Carducci to Olathe (Kansas) | 5,101.17 mi (8,209.53 km) |
| Castagneto Carducci to Old Jamestown (Missouri) | 4,921.54 mi (7,920.46 km) |
| Castagneto Carducci to Oldsmar (Florida) | 5,074.31 mi (8,166.32 km) |
| Castagneto Carducci to Olean (New York) | 4,292.00 mi (6,907.31 km) |
| Castagneto Carducci to Olive Branch (Mississippi) | 5,079.95 mi (8,175.39 km) |
| Castagneto Carducci to Olivehurst (California) | 6,015.35 mi (9,680.77 km) |
| Castagneto Carducci to Olney (Maryland) | 4,348.96 mi (6,998.97 km) |
| Castagneto Carducci to Olympia (Washington) | 5,588.03 mi (8,993.06 km) |
