| Grugliasco to Olympia Heights (Florida) | 4,885.34 mi (7,862.20 km) |
| Grugliasco to Omaha (Nebraska) | 4,837.51 mi (7,785.22 km) |
| Grugliasco to On Top of the World Designated Place (Florida) | 4,820.49 mi (7,757.84 km) |
| Grugliasco to Onalaska (Wisconsin) | 4,532.77 mi (7,294.79 km) |
| Grugliasco to Oneida (New York) | 3,940.21 mi (6,341.15 km) |
| Grugliasco to Oneonta (New York) | 3,938.56 mi (6,338.51 km) |
| Grugliasco to Ontario (California) | 5,984.47 mi (9,631.07 km) |
| Grugliasco to Ontario (Oregon) | 5,405.17 mi (8,698.77 km) |
| Grugliasco to Opa-locka (Florida) | 4,873.39 mi (7,842.97 km) |
| Grugliasco to Opelika (Alabama) | 4,796.90 mi (7,719.86 km) |
| Grugliasco to Opelousas (Louisiana) | 5,187.41 mi (8,348.33 km) |
| Grugliasco to Orange (California) | 6,004.89 mi (9,663.93 km) |
| Grugliasco to Orange (Texas) | 5,278.56 mi (8,495.03 km) |
| Grugliasco to Orange City (Florida) | 4,782.77 mi (7,697.12 km) |
| Grugliasco to Orangeburg (South Carolina) | 4,560.52 mi (7,339.45 km) |
