| San Juan to Silver Firs (Washington) | 3,724.02 mi (5,993.23 km) |
| San Juan to Silver Spring (Maryland) | 1,567.95 mi (2,523.37 km) |
| San Juan to Silver Springs Shores (Florida) | 1,249.05 mi (2,010.15 km) |
| San Juan to Silverdale (Washington) | 3,745.20 mi (6,027.31 km) |
| San Juan to Silverton (Oregon) | 3,713.56 mi (5,976.39 km) |
| San Juan to Simi Valley (California) | 3,401.34 mi (5,473.93 km) |
| San Juan to Simpsonville (South Carolina) | 1,503.87 mi (2,420.24 km) |
| San Juan to Sioux City (Iowa) | 2,432.39 mi (3,914.56 km) |
| San Juan to Sioux Falls (South Dakota) | 2,487.15 mi (4,002.69 km) |
| San Juan to Skokie (Illinois) | 2,071.01 mi (3,332.97 km) |
| San Juan to Sleepy Hollow (New York) | 1,634.82 mi (2,630.99 km) |
| San Juan to Slidell (Louisiana) | 1,698.93 mi (2,734.17 km) |
| San Juan to Smithfield (North Carolina) | 1,401.09 mi (2,254.84 km) |
| San Juan to Smithfield (Utah) | 3,128.18 mi (5,034.33 km) |
| San Juan to Smithville (Missouri) | 2,236.08 mi (3,598.62 km) |
