| Quarteira to Orangevale (California) | 5,693.31 mi (9,162.50 km) |
| Quarteira to Orchards (Washington) | 5,417.96 mi (8,719.36 km) |
| Quarteira to Orcutt (California) | 5,837.79 mi (9,395.02 km) |
| Quarteira to Oregon (Ohio) | 3,905.34 mi (6,285.04 km) |
| Quarteira to Oregon (Wisconsin) | 4,150.02 mi (6,678.81 km) |
| Quarteira to Oregon City (Oregon) | 5,436.28 mi (8,748.85 km) |
| Quarteira to Orem (Utah) | 5,231.20 mi (8,418.80 km) |
| Quarteira to Orinda (California) | 5,769.31 mi (9,284.81 km) |
| Quarteira to Orland Park (Illinois) | 4,116.61 mi (6,625.04 km) |
| Quarteira to Orlando (Florida) | 4,192.39 mi (6,747.00 km) |
| Quarteira to Ormond Beach (Florida) | 4,152.74 mi (6,683.18 km) |
| Quarteira to Oro Valley (Arizona) | 5,529.66 mi (8,899.13 km) |
| Quarteira to Oroville (California) | 5,669.15 mi (9,123.62 km) |
| Quarteira to Oshkosh (Wisconsin) | 4,081.31 mi (6,568.23 km) |
| Quarteira to Oskaloosa (Iowa) | 4,349.09 mi (6,999.18 km) |
