| San Marcos to Rockport (Texas) | 1,244.37 mi (2,002.61 km) |
| San Marcos to Rockville (Maryland) | 2,252.79 mi (3,625.51 km) |
| San Marcos to Rockville Centre (New York) | 2,435.39 mi (3,919.38 km) |
| San Marcos to Rockwall (Texas) | 1,199.41 mi (1,930.26 km) |
| San Marcos to Rocky Mount (North Carolina) | 2,233.84 mi (3,595.01 km) |
| San Marcos to Rocky Point (New York) | 2,471.45 mi (3,977.42 km) |
| San Marcos to Rocky River (Ohio) | 2,009.30 mi (3,233.65 km) |
| San Marcos to Roessleville (New York) | 2,426.25 mi (3,904.67 km) |
| San Marcos to Rogers (Arkansas) | 1,322.41 mi (2,128.21 km) |
| San Marcos to Rogers (Minnesota) | 1,504.86 mi (2,421.83 km) |
| San Marcos to Rohnert Park (California) | 474.80 mi (764.12 km) |
| San Marcos to Rolla (Missouri) | 1,462.01 mi (2,352.87 km) |
| San Marcos to Rolling Meadows (Illinois) | 1,700.66 mi (2,736.96 km) |
| San Marcos to Roma (Texas) | 1,182.15 mi (1,902.48 km) |
| San Marcos to Rome (Georgia) | 1,832.83 mi (2,949.65 km) |
