| Galveston to Oswego (Illinois) | 934.24 mi (1,503.52 km) |
| Galveston to Oswego (New York) | 1,411.78 mi (2,272.04 km) |
| Galveston to Otsego (Minnesota) | 1,108.88 mi (1,784.56 km) |
| Galveston to Ottawa (Illinois) | 903.11 mi (1,453.41 km) |
| Galveston to Ottawa (Kansas) | 646.46 mi (1,040.37 km) |
| Galveston to Ottumwa (Iowa) | 825.11 mi (1,327.89 km) |
| Galveston to Overland (Missouri) | 702.09 mi (1,129.91 km) |
| Galveston to Overland Park (Kansas) | 666.06 mi (1,071.93 km) |
| Galveston to Overlea (Maryland) | 1,256.31 mi (2,021.84 km) |
| Galveston to Oviedo (Florida) | 829.05 mi (1,334.23 km) |
| Galveston to Owasso (Oklahoma) | 489.42 mi (787.65 km) |
| Galveston to Owatonna (Minnesota) | 1,029.59 mi (1,656.97 km) |
| Galveston to Owensboro (Kentucky) | 738.45 mi (1,188.43 km) |
| Galveston to Owings Mills (Maryland) | 1,245.02 mi (2,003.67 km) |
| Galveston to Owosso (Michigan) | 1,120.26 mi (1,802.89 km) |
