| San Marino to Ridgefield Park (New Jersey) | 2,435.41 mi (3,919.41 km) |
| San Marino to Ridgeland (Mississippi) | 1,614.68 mi (2,598.58 km) |
| San Marino to Ridgewood (New Jersey) | 2,430.06 mi (3,910.80 km) |
| San Marino to Rifle (Colorado) | 682.62 mi (1,098.57 km) |
| San Marino to Rincon (Georgia) | 2,124.08 mi (3,418.38 km) |
| San Marino to Ringwood (New Jersey) | 2,421.15 mi (3,896.46 km) |
| San Marino to Río Grande (Puerto Rico) | 3,377.62 mi (5,435.75 km) |
| San Marino to Rio Grande City (Texas) | 1,266.72 mi (2,038.58 km) |
| San Marino to Rio Linda (California) | 365.65 mi (588.45 km) |
| San Marino to Rio Rancho (New Mexico) | 652.99 mi (1,050.89 km) |
| San Marino to Rio Rico (Arizona) | 451.65 mi (726.86 km) |
| San Marino to Ripon (California) | 301.68 mi (485.51 km) |
| San Marino to River Edge (New Jersey) | 2,434.14 mi (3,917.37 km) |
| San Marino to River Falls (Wisconsin) | 1,539.04 mi (2,476.85 km) |
| San Marino to River Forest (Illinois) | 1,723.96 mi (2,774.44 km) |
