| Southlake to Oskaloosa (Iowa) | 627.13 mi (1,009.26 km) |
| Southlake to Oswego (Illinois) | 772.55 mi (1,243.30 km) |
| Southlake to Oswego (New York) | 1,329.58 mi (2,139.74 km) |
| Southlake to Otsego (Minnesota) | 871.20 mi (1,402.07 km) |
| Southlake to Ottawa (Illinois) | 738.84 mi (1,189.05 km) |
| Southlake to Ottawa (Kansas) | 404.09 mi (650.33 km) |
| Southlake to Ottumwa (Iowa) | 615.13 mi (989.96 km) |
| Southlake to Overland (Missouri) | 548.96 mi (883.47 km) |
| Southlake to Overland Park (Kansas) | 432.40 mi (695.88 km) |
| Southlake to Overlea (Maryland) | 1,229.75 mi (1,979.09 km) |
| Southlake to Oviedo (Florida) | 991.54 mi (1,595.72 km) |
| Southlake to Owasso (Oklahoma) | 242.21 mi (389.79 km) |
| Southlake to Owatonna (Minnesota) | 797.84 mi (1,284.00 km) |
| Southlake to Owensboro (Kentucky) | 655.00 mi (1,054.12 km) |
| Southlake to Owings Mills (Maryland) | 1,216.47 mi (1,957.71 km) |
