| Santa Coloma de Farnes to Olympia Heights (Florida) | 4,712.15 mi (7,583.48 km) |
| Santa Coloma de Farnes to Omaha (Nebraska) | 4,780.59 mi (7,693.61 km) |
| Santa Coloma de Farnes to On Top of the World Designated Place (Florida) | 4,667.29 mi (7,511.28 km) |
| Santa Coloma de Farnes to Onalaska (Wisconsin) | 4,474.59 mi (7,201.16 km) |
| Santa Coloma de Farnes to Oneida (New York) | 3,837.40 mi (6,175.69 km) |
| Santa Coloma de Farnes to Oneonta (New York) | 3,830.76 mi (6,165.01 km) |
| Santa Coloma de Farnes to Ontario (California) | 5,971.01 mi (9,609.40 km) |
| Santa Coloma de Farnes to Ontario (Oregon) | 5,425.50 mi (8,731.49 km) |
| Santa Coloma de Farnes to Opa-locka (Florida) | 4,700.67 mi (7,564.99 km) |
| Santa Coloma de Farnes to Opelika (Alabama) | 4,668.59 mi (7,513.37 km) |
| Santa Coloma de Farnes to Opelousas (Louisiana) | 5,070.72 mi (8,160.53 km) |
| Santa Coloma de Farnes to Orange (California) | 5,991.41 mi (9,642.24 km) |
| Santa Coloma de Farnes to Orange (Texas) | 5,165.63 mi (8,313.28 km) |
| Santa Coloma de Farnes to Orange City (Florida) | 4,625.83 mi (7,444.56 km) |
| Santa Coloma de Farnes to Orangeburg (South Carolina) | 4,422.63 mi (7,117.54 km) |
