| Trecastagni to Oakley (California) | 6,532.16 mi (10,512.50 km) |
| Trecastagni to Oakton (Virginia) | 4,770.93 mi (7,678.07 km) |
| Trecastagni to Oakville (Missouri) | 5,361.54 mi (8,628.57 km) |
| Trecastagni to Oatfield (Oregon) | 6,125.10 mi (9,857.39 km) |
| Trecastagni to Ocala (Florida) | 5,378.88 mi (8,656.47 km) |
| Trecastagni to Ocean Acres (New Jersey) | 4,602.24 mi (7,406.58 km) |
| Trecastagni to Ocean City (New Jersey) | 4,633.66 mi (7,457.16 km) |
| Trecastagni to Ocean Pines (Maryland) | 4,690.28 mi (7,548.27 km) |
| Trecastagni to Ocean Pointe (Hawaii) | 8,340.47 mi (13,422.70 km) |
| Trecastagni to Ocean Springs (Mississippi) | 5,641.59 mi (9,079.27 km) |
| Trecastagni to Oceanside (California) | 6,663.89 mi (10,724.50 km) |
| Trecastagni to Oceanside (New York) | 4,542.04 mi (7,309.70 km) |
| Trecastagni to Ocoee (Florida) | 5,373.36 mi (8,647.59 km) |
| Trecastagni to Oconomowoc (Wisconsin) | 5,089.71 mi (8,191.09 km) |
| Trecastagni to Odenton (Maryland) | 4,736.74 mi (7,623.04 km) |
