| San Marcos to River Grove (Illinois) | 1,708.03 mi (2,748.81 km) |
| San Marcos to River Ridge (Louisiana) | 1,597.75 mi (2,571.32 km) |
| San Marcos to Riverbank (California) | 381.55 mi (614.04 km) |
| San Marcos to Riverdale (Georgia) | 1,883.27 mi (3,030.83 km) |
| San Marcos to Riverdale (Illinois) | 1,714.60 mi (2,759.38 km) |
| San Marcos to Riverside (California) | 56.92 mi (91.61 km) |
| San Marcos to Riverside (Ohio) | 1,881.74 mi (3,028.38 km) |
| San Marcos to Riverton (Utah) | 585.59 mi (942.41 km) |
| San Marcos to Riverton (Wyoming) | 832.89 mi (1,340.41 km) |
| San Marcos to Riverview (Florida) | 2,098.82 mi (3,377.73 km) |
| San Marcos to Riverview (Michigan) | 1,945.88 mi (3,131.59 km) |
| San Marcos to Riviera Beach (Florida) | 2,251.81 mi (3,623.95 km) |
| San Marcos to Riviera Beach (Maryland) | 2,286.30 mi (3,679.44 km) |
| San Marcos to Roanoke (Virginia) | 2,106.80 mi (3,390.57 km) |
| San Marcos to Roanoke Rapids (North Carolina) | 2,238.79 mi (3,602.98 km) |
