| Southborough to Rancho Cordova (California) | 5,302.33 mi (8,533.28 km) |
| Southborough to Rancho Cucamonga (California) | 5,443.20 mi (8,759.98 km) |
| Southborough to Rancho Mirage (California) | 5,426.59 mi (8,733.25 km) |
| Southborough to Rancho Palos Verdes (California) | 5,489.98 mi (8,835.28 km) |
| Southborough to Rancho San Diego (California) | 5,499.65 mi (8,850.83 km) |
| Southborough to Rancho Santa Margarita (California) | 5,472.34 mi (8,806.88 km) |
| Southborough to Randallstown (Maryland) | 3,658.05 mi (5,887.06 km) |
| Southborough to Rantoul (Illinois) | 4,067.43 mi (6,545.89 km) |
| Southborough to Rapid City (South Dakota) | 4,429.37 mi (7,128.39 km) |
| Southborough to Ravenna (Ohio) | 3,757.40 mi (6,046.96 km) |
| Southborough to Raymondville (Texas) | 5,141.39 mi (8,274.27 km) |
| Southborough to Raymore (Missouri) | 4,380.14 mi (7,049.15 km) |
| Southborough to Raytown (Missouri) | 4,370.90 mi (7,034.28 km) |
| Southborough to Reading (Ohio) | 3,972.25 mi (6,392.71 km) |
| Southborough to Reading (Pennsylvania) | 3,579.64 mi (5,760.87 km) |
