| Southborough to Ridgeland (Mississippi) | 4,529.47 mi (7,289.47 km) |
| Southborough to Ridgewood (New Jersey) | 3,477.73 mi (5,596.86 km) |
| Southborough to Rifle (Colorado) | 4,819.54 mi (7,756.30 km) |
| Southborough to Rincon (Georgia) | 4,170.69 mi (6,712.08 km) |
| Southborough to Ringwood (New Jersey) | 3,479.03 mi (5,598.96 km) |
| Southborough to Río Grande (Puerto Rico) | 4,206.25 mi (6,769.31 km) |
| Southborough to Rio Grande City (Texas) | 5,187.97 mi (8,349.23 km) |
| Southborough to Rio Linda (California) | 5,301.36 mi (8,531.71 km) |
| Southborough to Rio Rancho (New Mexico) | 5,009.73 mi (8,062.39 km) |
| Southborough to Rio Rico (Arizona) | 5,368.37 mi (8,639.56 km) |
| Southborough to Ripon (California) | 5,346.76 mi (8,604.77 km) |
| Southborough to River Edge (New Jersey) | 3,477.06 mi (5,595.79 km) |
| Southborough to River Falls (Wisconsin) | 4,020.96 mi (6,471.11 km) |
| Southborough to River Forest (Illinois) | 3,980.25 mi (6,405.59 km) |
| Southborough to River Grove (Illinois) | 3,979.60 mi (6,404.54 km) |
