| Monforte del Cid to Olympia Heights (Florida) | 4,602.85 mi (7,407.57 km) |
| Monforte del Cid to Omaha (Nebraska) | 4,782.54 mi (7,696.75 km) |
| Monforte del Cid to On Top of the World Designated Place (Florida) | 4,578.17 mi (7,367.85 km) |
| Monforte del Cid to Onalaska (Wisconsin) | 4,477.54 mi (7,205.91 km) |
| Monforte del Cid to Oneida (New York) | 3,803.42 mi (6,121.02 km) |
| Monforte del Cid to Oneonta (New York) | 3,792.05 mi (6,102.71 km) |
| Monforte del Cid to Ontario (California) | 6,005.01 mi (9,664.13 km) |
| Monforte del Cid to Ontario (Oregon) | 5,492.95 mi (8,840.04 km) |
| Monforte del Cid to Opa-locka (Florida) | 4,591.89 mi (7,389.94 km) |
| Monforte del Cid to Opelika (Alabama) | 4,603.83 mi (7,409.14 km) |
| Monforte del Cid to Opelousas (Louisiana) | 5,014.59 mi (8,070.20 km) |
| Monforte del Cid to Orange (California) | 6,025.28 mi (9,696.75 km) |
| Monforte del Cid to Orange (Texas) | 5,112.50 mi (8,227.77 km) |
| Monforte del Cid to Orange City (Florida) | 4,533.27 mi (7,295.59 km) |
| Monforte del Cid to Orangeburg (South Carolina) | 4,350.18 mi (7,000.94 km) |
