| San Marcos to Reading (Pennsylvania) | 2,315.75 mi (3,726.85 km) |
| San Marcos to Red Bank (New Jersey) | 2,413.63 mi (3,884.36 km) |
| San Marcos to Red Bank (Tennessee) | 1,820.71 mi (2,930.16 km) |
| San Marcos to Red Bluff (California) | 561.34 mi (903.39 km) |
| San Marcos to Red Hill (South Carolina) | 2,187.61 mi (3,520.62 km) |
| San Marcos to Red Oak (Texas) | 1,182.59 mi (1,903.19 km) |
| San Marcos to Red Wing (Minnesota) | 1,531.44 mi (2,464.61 km) |
| San Marcos to Redan (Georgia) | 1,895.54 mi (3,050.58 km) |
| San Marcos to Redding (California) | 588.14 mi (946.52 km) |
| San Marcos to Redland (Maryland) | 2,253.14 mi (3,626.07 km) |
| San Marcos to Redlands (California) | 63.30 mi (101.88 km) |
| San Marcos to Redmond (Oregon) | 798.26 mi (1,284.67 km) |
| San Marcos to Redmond (Washington) | 1,037.25 mi (1,669.29 km) |
| San Marcos to Redondo Beach (California) | 85.39 mi (137.42 km) |
| San Marcos to Redwood City (California) | 414.77 mi (667.51 km) |
