| Idrija to Silver Firs (Washington) | 5,432.51 mi (8,742.78 km) |
| Idrija to Silver Spring (Maryland) | 4,402.15 mi (7,084.57 km) |
| Idrija to Silver Springs Shores (Florida) | 5,069.70 mi (8,158.90 km) |
| Idrija to Silverdale (Washington) | 5,456.48 mi (8,781.36 km) |
| Idrija to Silverton (Oregon) | 5,619.87 mi (9,044.30 km) |
| Idrija to Simi Valley (California) | 6,158.35 mi (9,910.91 km) |
| Idrija to Simpsonville (South Carolina) | 4,814.15 mi (7,747.62 km) |
| Idrija to Sioux City (Iowa) | 4,981.92 mi (8,017.62 km) |
| Idrija to Sioux Falls (South Dakota) | 4,941.13 mi (7,951.99 km) |
| Idrija to Skokie (Illinois) | 4,690.38 mi (7,548.43 km) |
| Idrija to Sleepy Hollow (New York) | 4,181.97 mi (6,730.24 km) |
| Idrija to Slidell (Louisiana) | 5,341.75 mi (8,596.71 km) |
| Idrija to Smithfield (North Carolina) | 4,613.35 mi (7,424.47 km) |
| Idrija to Smithfield (Utah) | 5,515.30 mi (8,876.02 km) |
| Idrija to Smithville (Missouri) | 5,073.12 mi (8,164.40 km) |
