| Galesburg to Oswego (Illinois) | 117.30 mi (188.78 km) |
| Galesburg to Oswego (New York) | 729.98 mi (1,174.79 km) |
| Galesburg to Otsego (Minnesota) | 340.04 mi (547.24 km) |
| Galesburg to Ottawa (Illinois) | 85.36 mi (137.37 km) |
| Galesburg to Ottawa (Kansas) | 306.10 mi (492.61 km) |
| Galesburg to Ottumwa (Iowa) | 106.62 mi (171.60 km) |
| Galesburg to Overland (Missouri) | 155.74 mi (250.63 km) |
| Galesburg to Overland Park (Kansas) | 269.22 mi (433.28 km) |
| Galesburg to Overlea (Maryland) | 739.19 mi (1,189.61 km) |
| Galesburg to Oviedo (Florida) | 995.19 mi (1,601.60 km) |
| Galesburg to Owasso (Oklahoma) | 436.28 mi (702.12 km) |
| Galesburg to Owatonna (Minnesota) | 261.16 mi (420.29 km) |
| Galesburg to Owensboro (Kentucky) | 281.01 mi (452.24 km) |
| Galesburg to Owings Mills (Maryland) | 724.21 mi (1,165.50 km) |
| Galesburg to Owosso (Michigan) | 348.31 mi (560.56 km) |
