| South San Francisco to Ridgefield Park (New Jersey) | 2,565.94 mi (4,129.47 km) |
| South San Francisco to Ridgeland (Mississippi) | 1,851.54 mi (2,979.77 km) |
| South San Francisco to Ridgewood (New Jersey) | 2,559.48 mi (4,119.08 km) |
| South San Francisco to Rifle (Colorado) | 800.63 mi (1,288.50 km) |
| South San Francisco to Rincon (Georgia) | 2,341.97 mi (3,769.03 km) |
| South San Francisco to Ringwood (New Jersey) | 2,549.55 mi (4,103.10 km) |
| South San Francisco to Río Grande (Puerto Rico) | 3,639.08 mi (5,856.54 km) |
| South San Francisco to Rio Grande City (Texas) | 1,580.10 mi (2,542.93 km) |
| South San Francisco to Rio Linda (California) | 89.01 mi (143.24 km) |
| South San Francisco to Rio Rancho (New Mexico) | 887.57 mi (1,428.41 km) |
| South San Francisco to Rio Rico (Arizona) | 776.22 mi (1,249.20 km) |
| South San Francisco to Ripon (California) | 70.71 mi (113.79 km) |
| South San Francisco to River Edge (New Jersey) | 2,564.01 mi (4,126.37 km) |
| South San Francisco to River Falls (Wisconsin) | 1,615.18 mi (2,599.37 km) |
| South San Francisco to River Forest (Illinois) | 1,847.80 mi (2,973.75 km) |
