| Povoa de Santa Iria to Olympia Heights (Florida) | 4,156.60 mi (6,689.40 km) |
| Povoa de Santa Iria to Omaha (Nebraska) | 4,394.46 mi (7,072.20 km) |
| Povoa de Santa Iria to On Top of the World Designated Place (Florida) | 4,138.08 mi (6,659.60 km) |
| Povoa de Santa Iria to Onalaska (Wisconsin) | 4,091.73 mi (6,585.01 km) |
| Povoa de Santa Iria to Oneida (New York) | 3,393.86 mi (5,461.89 km) |
| Povoa de Santa Iria to Oneonta (New York) | 3,379.44 mi (5,438.69 km) |
| Povoa de Santa Iria to Ontario (California) | 5,638.01 mi (9,073.50 km) |
| Povoa de Santa Iria to Ontario (Oregon) | 5,161.08 mi (8,305.96 km) |
| Povoa de Santa Iria to Opa-locka (Florida) | 4,145.79 mi (6,672.00 km) |
| Povoa de Santa Iria to Opelika (Alabama) | 4,173.96 mi (6,717.34 km) |
| Povoa de Santa Iria to Opelousas (Louisiana) | 4,588.06 mi (7,383.77 km) |
| Povoa de Santa Iria to Orange (California) | 5,658.06 mi (9,105.77 km) |
| Povoa de Santa Iria to Orange (Texas) | 4,687.29 mi (7,543.46 km) |
| Povoa de Santa Iria to Orange City (Florida) | 4,092.04 mi (6,585.50 km) |
| Povoa de Santa Iria to Orangeburg (South Carolina) | 3,917.29 mi (6,304.27 km) |
