| San Marcos to Reedley (California) | 271.78 mi (437.39 km) |
| San Marcos to Reidsville (North Carolina) | 2,127.51 mi (3,423.90 km) |
| San Marcos to Reisterstown (Maryland) | 2,270.17 mi (3,653.48 km) |
| San Marcos to Rendon (Texas) | 1,156.18 mi (1,860.70 km) |
| San Marcos to Reno (Nevada) | 467.46 mi (752.31 km) |
| San Marcos to Renton (Washington) | 1,025.12 mi (1,649.76 km) |
| San Marcos to Republic (Missouri) | 1,365.27 mi (2,197.19 km) |
| San Marcos to Reston (Virginia) | 2,242.90 mi (3,609.60 km) |
| San Marcos to Revere (Massachusetts) | 2,568.37 mi (4,133.40 km) |
| San Marcos to Rexburg (Idaho) | 793.29 mi (1,276.68 km) |
| San Marcos to Reynoldsburg (Ohio) | 1,952.73 mi (3,142.61 km) |
| San Marcos to Rialto (California) | 69.00 mi (111.05 km) |
| San Marcos to Richardson (Texas) | 1,183.32 mi (1,904.37 km) |
| San Marcos to Richfield (Minnesota) | 1,508.95 mi (2,428.42 km) |
| San Marcos to Richfield (Wisconsin) | 1,708.07 mi (2,748.88 km) |
