| Vila Nova de Gaia to Orangevale (California) | 5,480.91 mi (8,820.67 km) |
| Vila Nova de Gaia to Orchards (Washington) | 5,187.70 mi (8,348.80 km) |
| Vila Nova de Gaia to Orcutt (California) | 5,636.22 mi (9,070.63 km) |
| Vila Nova de Gaia to Oregon (Ohio) | 3,746.63 mi (6,029.61 km) |
| Vila Nova de Gaia to Oregon (Wisconsin) | 3,976.91 mi (6,400.22 km) |
| Vila Nova de Gaia to Oregon City (Oregon) | 5,206.68 mi (8,379.34 km) |
| Vila Nova de Gaia to Orem (Utah) | 5,031.18 mi (8,096.91 km) |
| Vila Nova de Gaia to Orinda (California) | 5,557.10 mi (8,943.29 km) |
| Vila Nova de Gaia to Orland Park (Illinois) | 3,951.26 mi (6,358.95 km) |
| Vila Nova de Gaia to Orlando (Florida) | 4,098.33 mi (6,595.62 km) |
| Vila Nova de Gaia to Ormond Beach (Florida) | 4,055.45 mi (6,526.62 km) |
| Vila Nova de Gaia to Oro Valley (Arizona) | 5,354.15 mi (8,616.67 km) |
| Vila Nova de Gaia to Oroville (California) | 5,454.23 mi (8,777.74 km) |
| Vila Nova de Gaia to Oshkosh (Wisconsin) | 3,904.90 mi (6,284.34 km) |
| Vila Nova de Gaia to Oskaloosa (Iowa) | 4,177.47 mi (6,722.99 km) |
