| Galesburg to Olympia Heights (Florida) | 1,199.05 mi (1,929.68 km) |
| Galesburg to Omaha (Nebraska) | 296.26 mi (476.79 km) |
| Galesburg to On Top of the World Designated Place (Florida) | 936.64 mi (1,507.38 km) |
| Galesburg to Onalaska (Wisconsin) | 207.35 mi (333.70 km) |
| Galesburg to Oneida (New York) | 768.44 mi (1,236.69 km) |
| Galesburg to Oneonta (New York) | 795.46 mi (1,280.17 km) |
| Galesburg to Ontario (California) | 1,559.83 mi (2,510.30 km) |
| Galesburg to Ontario (Oregon) | 1,365.71 mi (2,197.90 km) |
| Galesburg to Opa-locka (Florida) | 1,190.49 mi (1,915.91 km) |
| Galesburg to Opelika (Alabama) | 635.73 mi (1,023.10 km) |
| Galesburg to Opelousas (Louisiana) | 726.60 mi (1,169.35 km) |
| Galesburg to Orange (California) | 1,578.07 mi (2,539.65 km) |
| Galesburg to Orange (Texas) | 771.78 mi (1,242.06 km) |
| Galesburg to Orange City (Florida) | 975.51 mi (1,569.93 km) |
| Galesburg to Orangeburg (South Carolina) | 733.45 mi (1,180.38 km) |
