| Silleda to Olympia Heights (Florida) | 4,155.74 mi (6,688.01 km) |
| Silleda to Omaha (Nebraska) | 4,289.16 mi (6,902.73 km) |
| Silleda to On Top of the World Designated Place (Florida) | 4,116.79 mi (6,625.33 km) |
| Silleda to Onalaska (Wisconsin) | 3,984.02 mi (6,411.65 km) |
| Silleda to Oneida (New York) | 3,316.04 mi (5,336.66 km) |
| Silleda to Oneonta (New York) | 3,306.07 mi (5,320.61 km) |
| Silleda to Ontario (California) | 5,511.59 mi (8,870.05 km) |
| Silleda to Ontario (Oregon) | 5,005.89 mi (8,056.21 km) |
| Silleda to Opa-locka (Florida) | 4,144.36 mi (6,669.71 km) |
| Silleda to Opelika (Alabama) | 4,128.89 mi (6,644.81 km) |
| Silleda to Opelousas (Louisiana) | 4,536.07 mi (7,300.09 km) |
| Silleda to Orange (California) | 5,531.85 mi (8,902.65 km) |
| Silleda to Orange (Texas) | 4,632.80 mi (7,455.77 km) |
| Silleda to Orange City (Florida) | 4,074.09 mi (6,556.61 km) |
| Silleda to Orangeburg (South Carolina) | 3,878.91 mi (6,242.50 km) |
