| San Marcos to Oak Grove (South Carolina) | 2,064.46 mi (3,322.43 km) |
| San Marcos to Oak Harbor (Washington) | 1,085.14 mi (1,746.36 km) |
| San Marcos to Oak Hills (Oregon) | 908.45 mi (1,462.01 km) |
| San Marcos to Oak Lawn (Illinois) | 1,709.58 mi (2,751.31 km) |
| San Marcos to Oak Park (California) | 116.84 mi (188.03 km) |
| San Marcos to Oak Park (Illinois) | 1,709.96 mi (2,751.92 km) |
| San Marcos to Oak Park (Michigan) | 1,949.20 mi (3,136.94 km) |
| San Marcos to Oak Ridge (Florida) | 2,135.98 mi (3,437.53 km) |
| San Marcos to Oak Ridge (New Jersey) | 2,389.91 mi (3,846.19 km) |
| San Marcos to Oak Ridge (Tennessee) | 1,872.49 mi (3,013.48 km) |
| San Marcos to Oakdale (California) | 380.61 mi (612.53 km) |
| San Marcos to Oakdale (Minnesota) | 1,526.32 mi (2,456.38 km) |
| San Marcos to Oakland (California) | 428.78 mi (690.06 km) |
| San Marcos to Oakland (New Jersey) | 2,403.27 mi (3,867.69 km) |
| San Marcos to Oakland Park (Florida) | 2,262.04 mi (3,640.40 km) |
