| Galveston to Orangevale (California) | 1,636.11 mi (2,633.06 km) |
| Galveston to Orchards (Washington) | 1,878.08 mi (3,022.48 km) |
| Galveston to Orcutt (California) | 1,539.94 mi (2,478.29 km) |
| Galveston to Oregon (Ohio) | 1,070.48 mi (1,722.77 km) |
| Galveston to Oregon (Wisconsin) | 993.07 mi (1,598.19 km) |
| Galveston to Oregon City (Oregon) | 1,869.74 mi (3,009.06 km) |
| Galveston to Orem (Utah) | 1,218.12 mi (1,960.37 km) |
| Galveston to Orinda (California) | 1,672.89 mi (2,692.25 km) |
| Galveston to Orland Park (Illinois) | 940.33 mi (1,513.32 km) |
| Galveston to Orlando (Florida) | 821.45 mi (1,321.99 km) |
| Galveston to Ormond Beach (Florida) | 830.64 mi (1,336.79 km) |
| Galveston to Oro Valley (Arizona) | 978.09 mi (1,574.09 km) |
| Galveston to Oroville (California) | 1,669.40 mi (2,686.63 km) |
| Galveston to Oshkosh (Wisconsin) | 1,078.58 mi (1,735.80 km) |
| Galveston to Oskaloosa (Iowa) | 841.69 mi (1,354.57 km) |
