| Ponte da Barca to Olympia Heights (Florida) | 4,156.09 mi (6,688.59 km) |
| Ponte da Barca to Omaha (Nebraska) | 4,314.09 mi (6,942.86 km) |
| Ponte da Barca to On Top of the World Designated Place (Florida) | 4,121.91 mi (6,633.58 km) |
| Ponte da Barca to Onalaska (Wisconsin) | 4,009.37 mi (6,452.46 km) |
| Ponte da Barca to Oneida (New York) | 3,333.97 mi (5,365.51 km) |
| Ponte da Barca to Oneonta (New York) | 3,322.94 mi (5,347.76 km) |
| Ponte da Barca to Ontario (California) | 5,541.93 mi (8,918.87 km) |
| Ponte da Barca to Ontario (Oregon) | 5,042.77 mi (8,115.56 km) |
| Ponte da Barca to Opa-locka (Florida) | 4,144.85 mi (6,670.49 km) |
| Ponte da Barca to Opelika (Alabama) | 4,139.60 mi (6,662.04 km) |
| Ponte da Barca to Opelousas (Louisiana) | 4,548.60 mi (7,320.27 km) |
| Ponte da Barca to Orange (California) | 5,562.14 mi (8,951.40 km) |
| Ponte da Barca to Orange (Texas) | 4,645.97 mi (7,476.96 km) |
| Ponte da Barca to Orange City (Florida) | 4,078.41 mi (6,563.56 km) |
| Ponte da Barca to Orangeburg (South Carolina) | 3,887.91 mi (6,256.98 km) |
