| San Marcos to Rosemead (California) | 83.03 mi (133.62 km) |
| San Marcos to Rosemont (California) | 441.13 mi (709.93 km) |
| San Marcos to Rosemount (Minnesota) | 1,515.02 mi (2,438.19 km) |
| San Marcos to Rosenberg (Texas) | 1,281.82 mi (2,062.89 km) |
| San Marcos to Roseville (California) | 453.03 mi (729.08 km) |
| San Marcos to Roseville (Michigan) | 1,962.00 mi (3,157.53 km) |
| San Marcos to Roseville (Minnesota) | 1,518.63 mi (2,444.00 km) |
| San Marcos to Rossmoor (California) | 69.04 mi (111.12 km) |
| San Marcos to Rossville (Maryland) | 2,288.39 mi (3,682.81 km) |
| San Marcos to Roswell (Georgia) | 1,882.14 mi (3,029.00 km) |
| San Marcos to Roswell (New Mexico) | 730.35 mi (1,175.38 km) |
| San Marcos to Round Lake (Illinois) | 1,700.49 mi (2,736.67 km) |
| San Marcos to Round Lake Beach (Illinois) | 1,702.25 mi (2,739.51 km) |
| San Marcos to Round Rock (Texas) | 1,157.63 mi (1,863.03 km) |
| San Marcos to Rowland Heights (California) | 71.03 mi (114.31 km) |
