| Idanha-a-Nova to Orangevale (California) | 5,591.43 mi (8,998.54 km) |
| Idanha-a-Nova to Orchards (Washington) | 5,298.80 mi (8,527.60 km) |
| Idanha-a-Nova to Orcutt (California) | 5,745.94 mi (9,247.20 km) |
| Idanha-a-Nova to Oregon (Ohio) | 3,850.19 mi (6,196.28 km) |
| Idanha-a-Nova to Oregon (Wisconsin) | 4,082.89 mi (6,570.77 km) |
| Idanha-a-Nova to Oregon City (Oregon) | 5,317.78 mi (8,558.14 km) |
| Idanha-a-Nova to Orem (Utah) | 5,140.69 mi (8,273.15 km) |
| Idanha-a-Nova to Orinda (California) | 5,667.62 mi (9,121.15 km) |
| Idanha-a-Nova to Orland Park (Illinois) | 4,056.01 mi (6,527.52 km) |
| Idanha-a-Nova to Orlando (Florida) | 4,188.38 mi (6,740.55 km) |
| Idanha-a-Nova to Ormond Beach (Florida) | 4,146.27 mi (6,672.77 km) |
| Idanha-a-Nova to Oro Valley (Arizona) | 5,460.79 mi (8,788.29 km) |
| Idanha-a-Nova to Oroville (California) | 5,564.90 mi (8,955.84 km) |
| Idanha-a-Nova to Oshkosh (Wisconsin) | 4,011.35 mi (6,455.64 km) |
| Idanha-a-Nova to Oskaloosa (Iowa) | 4,283.28 mi (6,893.27 km) |
