| Grad to Olympia Heights (Florida) | 5,229.37 mi (8,415.85 km) |
| Grad to Omaha (Nebraska) | 5,067.20 mi (8,154.87 km) |
| Grad to On Top of the World Designated Place (Florida) | 5,146.98 mi (8,283.27 km) |
| Grad to Onalaska (Wisconsin) | 4,766.55 mi (7,671.02 km) |
| Grad to Oneida (New York) | 4,225.19 mi (6,799.78 km) |
| Grad to Oneonta (New York) | 4,228.41 mi (6,804.97 km) |
| Grad to Ontario (California) | 6,154.75 mi (9,905.11 km) |
| Grad to Ontario (Oregon) | 5,540.37 mi (8,916.37 km) |
| Grad to Opa-locka (Florida) | 5,217.07 mi (8,396.06 km) |
| Grad to Opelika (Alabama) | 5,100.16 mi (8,207.92 km) |
| Grad to Opelousas (Louisiana) | 5,476.73 mi (8,813.95 km) |
| Grad to Orange (California) | 6,175.00 mi (9,937.70 km) |
| Grad to Orange (Texas) | 5,563.53 mi (8,953.63 km) |
| Grad to Orange City (Florida) | 5,112.86 mi (8,228.36 km) |
| Grad to Orangeburg (South Carolina) | 4,874.39 mi (7,844.57 km) |
