| San Pietro in Casale to Oakley (California) | 6,019.32 mi (9,687.15 km) |
| San Pietro in Casale to Oakton (Virginia) | 4,352.24 mi (7,004.25 km) |
| San Pietro in Casale to Oakville (Missouri) | 4,910.95 mi (7,903.41 km) |
| San Pietro in Casale to Oatfield (Oregon) | 5,604.87 mi (9,020.17 km) |
| San Pietro in Casale to Ocala (Florida) | 4,993.58 mi (8,036.39 km) |
| San Pietro in Casale to Ocean Acres (New Jersey) | 4,187.18 mi (6,738.61 km) |
| San Pietro in Casale to Ocean City (New Jersey) | 4,220.25 mi (6,791.84 km) |
| San Pietro in Casale to Ocean Pines (Maryland) | 4,280.02 mi (6,888.03 km) |
| San Pietro in Casale to Ocean Pointe (Hawaii) | 7,827.07 mi (12,596.45 km) |
| San Pietro in Casale to Ocean Springs (Mississippi) | 5,227.84 mi (8,413.39 km) |
| San Pietro in Casale to Oceanside (California) | 6,164.68 mi (9,921.10 km) |
| San Pietro in Casale to Oceanside (New York) | 4,123.95 mi (6,636.85 km) |
| San Pietro in Casale to Ocoee (Florida) | 4,993.30 mi (8,035.95 km) |
| San Pietro in Casale to Oconomowoc (Wisconsin) | 4,626.28 mi (7,445.28 km) |
| San Pietro in Casale to Odenton (Maryland) | 4,318.78 mi (6,950.40 km) |
