| San Mateo to Ridgefield Park (New Jersey) | 2,562.89 mi (4,124.57 km) |
| San Mateo to Ridgeland (Mississippi) | 1,845.49 mi (2,970.03 km) |
| San Mateo to Ridgewood (New Jersey) | 2,556.46 mi (4,114.22 km) |
| San Mateo to Rifle (Colorado) | 796.64 mi (1,282.07 km) |
| San Mateo to Rincon (Georgia) | 2,336.53 mi (3,760.28 km) |
| San Mateo to Ringwood (New Jersey) | 2,546.55 mi (4,098.27 km) |
| San Mateo to Río Grande (Puerto Rico) | 3,632.61 mi (5,846.11 km) |
| San Mateo to Rio Grande City (Texas) | 1,571.97 mi (2,529.84 km) |
| San Mateo to Rio Linda (California) | 91.60 mi (147.42 km) |
| San Mateo to Rio Rancho (New Mexico) | 881.02 mi (1,417.87 km) |
| San Mateo to Rio Rico (Arizona) | 767.62 mi (1,235.37 km) |
| San Mateo to Ripon (California) | 65.93 mi (106.10 km) |
| San Mateo to River Edge (New Jersey) | 2,560.97 mi (4,121.49 km) |
| San Mateo to River Falls (Wisconsin) | 1,613.20 mi (2,596.20 km) |
| San Mateo to River Forest (Illinois) | 1,844.70 mi (2,968.75 km) |
