| Southborough to River Ridge (Louisiana) | 4,656.58 mi (7,494.05 km) |
| Southborough to Riverbank (California) | 5,342.03 mi (8,597.17 km) |
| Southborough to Riverdale (Georgia) | 4,240.39 mi (6,824.26 km) |
| Southborough to Riverdale (Illinois) | 3,984.88 mi (6,413.04 km) |
| Southborough to Riverside (California) | 5,448.26 mi (8,768.13 km) |
| Southborough to Riverside (Ohio) | 3,934.04 mi (6,331.22 km) |
| Southborough to Riverton (Utah) | 4,905.19 mi (7,894.13 km) |
| Southborough to Riverton (Wyoming) | 4,654.61 mi (7,490.88 km) |
| Southborough to Riverview (Florida) | 4,435.54 mi (7,138.30 km) |
| Southborough to Riverview (Michigan) | 3,789.07 mi (6,097.91 km) |
| Southborough to Riviera Beach (Florida) | 4,393.09 mi (7,070.00 km) |
| Southborough to Riviera Beach (Maryland) | 3,656.05 mi (5,883.84 km) |
| Southborough to Roanoke (Virginia) | 3,882.03 mi (6,247.52 km) |
| Southborough to Roanoke Rapids (North Carolina) | 3,825.40 mi (6,156.38 km) |
| Southborough to Robbinsdale (Minnesota) | 4,038.72 mi (6,499.70 km) |
