| Guimar to Olympia Heights (Florida) | 3,891.92 mi (6,263.43 km) |
| Guimar to Omaha (Nebraska) | 4,450.90 mi (7,163.03 km) |
| Guimar to On Top of the World Designated Place (Florida) | 3,936.20 mi (6,334.70 km) |
| Guimar to Onalaska (Wisconsin) | 4,167.50 mi (6,706.95 km) |
| Guimar to Oneida (New York) | 3,403.09 mi (5,476.75 km) |
| Guimar to Oneonta (New York) | 3,375.20 mi (5,431.85 km) |
| Guimar to Ontario (California) | 5,726.82 mi (9,216.43 km) |
| Guimar to Ontario (Oregon) | 5,366.35 mi (8,636.31 km) |
| Guimar to Opa-locka (Florida) | 3,883.20 mi (6,249.40 km) |
| Guimar to Opelika (Alabama) | 4,044.37 mi (6,508.78 km) |
| Guimar to Opelousas (Louisiana) | 4,464.95 mi (7,185.64 km) |
| Guimar to Orange (California) | 5,745.60 mi (9,246.64 km) |
| Guimar to Orange (Texas) | 4,568.61 mi (7,352.47 km) |
| Guimar to Orange City (Florida) | 3,881.70 mi (6,247.00 km) |
| Guimar to Orangeburg (South Carolina) | 3,777.20 mi (6,078.82 km) |
