| San Marcos to Rowlett (Texas) | 1,192.99 mi (1,919.93 km) |
| San Marcos to Roy (Utah) | 622.59 mi (1,001.96 km) |
| San Marcos to Royal Kunia (Hawaii) | 2,618.19 mi (4,213.57 km) |
| San Marcos to Royal Oak (Michigan) | 1,951.06 mi (3,139.93 km) |
| San Marcos to Royal Palm Beach (Florida) | 2,245.00 mi (3,612.98 km) |
| San Marcos to Royse City (Texas) | 1,205.86 mi (1,940.65 km) |
| San Marcos to Ruskin (Florida) | 2,094.56 mi (3,370.87 km) |
| San Marcos to Russellville (Alabama) | 1,686.96 mi (2,714.89 km) |
| San Marcos to Russellville (Arkansas) | 1,378.02 mi (2,217.70 km) |
| San Marcos to Ruston (Louisiana) | 1,421.92 mi (2,288.35 km) |
| San Marcos to Rutherford (New Jersey) | 2,410.62 mi (3,879.52 km) |
| San Marcos to Rutland (Vermont) | 2,469.07 mi (3,973.58 km) |
| San Marcos to Sabana Grande (Puerto Rico) | 3,263.01 mi (5,251.32 km) |
| San Marcos to Sachse (Texas) | 1,190.81 mi (1,916.42 km) |
| San Marcos to Saco (Maine) | 2,594.91 mi (4,176.11 km) |
