| San Marcos to Ridgefield Park (New Jersey) | 2,415.04 mi (3,886.63 km) |
| San Marcos to Ridgeland (Mississippi) | 1,566.40 mi (2,520.87 km) |
| San Marcos to Ridgewood (New Jersey) | 2,410.01 mi (3,878.54 km) |
| San Marcos to Rifle (Colorado) | 684.44 mi (1,101.50 km) |
| San Marcos to Rincon (Georgia) | 2,079.74 mi (3,347.02 km) |
| San Marcos to Ringwood (New Jersey) | 2,401.41 mi (3,864.69 km) |
| San Marcos to Río Grande (Puerto Rico) | 3,318.10 mi (5,339.97 km) |
| San Marcos to Rio Grande City (Texas) | 1,193.43 mi (1,920.63 km) |
| San Marcos to Rio Linda (California) | 451.76 mi (727.03 km) |
| San Marcos to Rio Rancho (New Mexico) | 616.44 mi (992.07 km) |
| San Marcos to Rio Rico (Arizona) | 378.47 mi (609.09 km) |
| San Marcos to Ripon (California) | 388.39 mi (625.05 km) |
| San Marcos to River Edge (New Jersey) | 2,413.95 mi (3,884.88 km) |
| San Marcos to River Falls (Wisconsin) | 1,538.01 mi (2,475.19 km) |
| San Marcos to River Forest (Illinois) | 1,708.57 mi (2,749.69 km) |
