| Southborough to San Luis Obispo (California) | 5,475.73 mi (8,812.33 km) |
| Southborough to San Marcos (California) | 5,486.81 mi (8,830.16 km) |
| Southborough to San Marcos (Texas) | 4,969.02 mi (7,996.86 km) |
| Southborough to San Marino (California) | 5,460.95 mi (8,788.55 km) |
| Southborough to San Mateo (California) | 5,392.91 mi (8,679.06 km) |
| Southborough to San Pablo (California) | 5,369.94 mi (8,642.08 km) |
| Southborough to San Rafael (California) | 5,373.61 mi (8,648.00 km) |
| Southborough to San Ramon (California) | 5,369.58 mi (8,641.50 km) |
| Southborough to San Tan Valley (Arizona) | 5,295.26 mi (8,521.90 km) |
| Southborough to Sand Springs (Oklahoma) | 4,576.73 mi (7,365.53 km) |
| Southborough to Sandusky (Ohio) | 3,802.31 mi (6,119.23 km) |
| Southborough to Sandy (Oregon) | 4,938.31 mi (7,947.44 km) |
| Southborough to Sandy (Utah) | 4,898.63 mi (7,883.59 km) |
| Southborough to Sandy Springs (Georgia) | 4,220.69 mi (6,792.54 km) |
| Southborough to Sanford (Florida) | 4,344.12 mi (6,991.19 km) |
