| Gallatin to Olympia Heights (Florida) | 820.23 mi (1,320.03 km) |
| Gallatin to Omaha (Nebraska) | 615.88 mi (991.16 km) |
| Gallatin to On Top of the World Designated Place (Florida) | 558.03 mi (898.06 km) |
| Gallatin to Onalaska (Wisconsin) | 575.84 mi (926.73 km) |
| Gallatin to Oneida (New York) | 736.54 mi (1,185.34 km) |
| Gallatin to Oneonta (New York) | 738.40 mi (1,188.34 km) |
| Gallatin to Ontario (California) | 1,757.57 mi (2,828.54 km) |
| Gallatin to Ontario (Oregon) | 1,683.13 mi (2,708.73 km) |
| Gallatin to Opa-locka (Florida) | 811.43 mi (1,305.87 km) |
| Gallatin to Opelika (Alabama) | 264.24 mi (425.26 km) |
| Gallatin to Opelousas (Louisiana) | 517.65 mi (833.08 km) |
| Gallatin to Orange (California) | 1,773.60 mi (2,854.34 km) |
| Gallatin to Orange (Texas) | 603.17 mi (970.71 km) |
| Gallatin to Orange City (Florida) | 595.86 mi (958.94 km) |
| Gallatin to Orangeburg (South Carolina) | 374.67 mi (602.97 km) |
