| Mortara to Oakley (California) | 5,912.33 mi (9,514.97 km) |
| Mortara to Oakton (Virginia) | 4,220.19 mi (6,791.74 km) |
| Mortara to Oakville (Missouri) | 4,783.07 mi (7,697.61 km) |
| Mortara to Oatfield (Oregon) | 5,504.69 mi (8,858.94 km) |
| Mortara to Ocala (Florida) | 4,859.48 mi (7,820.58 km) |
| Mortara to Ocean Acres (New Jersey) | 4,054.76 mi (6,525.50 km) |
| Mortara to Ocean City (New Jersey) | 4,087.70 mi (6,578.52 km) |
| Mortara to Ocean Pines (Maryland) | 4,147.25 mi (6,674.35 km) |
| Mortara to Ocean Pointe (Hawaii) | 7,762.93 mi (12,493.23 km) |
| Mortara to Ocean Springs (Mississippi) | 5,095.61 mi (8,200.59 km) |
| Mortara to Oceanside (California) | 6,050.18 mi (9,736.82 km) |
| Mortara to Oceanside (New York) | 3,991.77 mi (6,424.13 km) |
| Mortara to Ocoee (Florida) | 4,859.00 mi (7,819.80 km) |
| Mortara to Oconomowoc (Wisconsin) | 4,500.66 mi (7,243.11 km) |
| Mortara to Odenton (Maryland) | 4,186.65 mi (6,737.77 km) |
