| Middlesex to Salisbury (New York) | 50.70 mi (81.60 km) |
| Middlesex to Salisbury (North Carolina) | 469.89 mi (756.21 km) |
| Middlesex to Salmon Creek (Washington) | 2,416.71 mi (3,889.32 km) |
| Middlesex to Salt Lake City (Utah) | 1,946.26 mi (3,132.20 km) |
| Middlesex to Sammamish (Washington) | 2,370.09 mi (3,814.28 km) |
| Middlesex to San Angelo (Texas) | 1,574.01 mi (2,533.13 km) |
| Middlesex to San Anselmo (California) | 2,545.12 mi (4,095.98 km) |
| Middlesex to San Antonio (Texas) | 1,553.63 mi (2,500.32 km) |
| Middlesex to San Benito (Texas) | 1,658.56 mi (2,669.20 km) |
| Middlesex to San Bernardino (California) | 2,368.04 mi (3,810.99 km) |
| Middlesex to San Bruno (California) | 2,546.32 mi (4,097.90 km) |
| Middlesex to San Buenaventura (California) | 2,465.80 mi (3,968.33 km) |
| Middlesex to San Carlos (California) | 2,540.90 mi (4,089.19 km) |
| Middlesex to San Carlos Park (Florida) | 1,060.35 mi (1,706.46 km) |
| Middlesex to San Clemente (California) | 2,404.10 mi (3,869.02 km) |
