| San Marcos to Robbinsdale (Minnesota) | 1,511.00 mi (2,431.71 km) |
| San Marcos to Robertsville (New Jersey) | 2,401.72 mi (3,865.19 km) |
| San Marcos to Robinson (Texas) | 1,175.27 mi (1,891.41 km) |
| San Marcos to Robstown (Texas) | 1,216.62 mi (1,957.96 km) |
| San Marcos to Rochester (Michigan) | 1,954.53 mi (3,145.51 km) |
| San Marcos to Rochester (Minnesota) | 1,522.60 mi (2,450.39 km) |
| San Marcos to Rochester (New Hampshire) | 2,569.02 mi (4,134.43 km) |
| San Marcos to Rochester (New York) | 2,234.88 mi (3,596.70 km) |
| San Marcos to Rochester Hills (Michigan) | 1,952.47 mi (3,142.20 km) |
| San Marcos to Rock Hill (South Carolina) | 2,062.32 mi (3,318.98 km) |
| San Marcos to Rock Island (Illinois) | 1,563.00 mi (2,515.41 km) |
| San Marcos to Rock Springs (Wyoming) | 728.93 mi (1,173.10 km) |
| San Marcos to Rockford (Illinois) | 1,651.46 mi (2,657.76 km) |
| San Marcos to Rockledge (Florida) | 2,178.60 mi (3,506.12 km) |
| San Marcos to Rocklin (California) | 453.22 mi (729.38 km) |
