| Napa to Silver Firs (Washington) | 660.99 mi (1,063.76 km) |
| Napa to Silver Spring (Maryland) | 2,418.08 mi (3,891.52 km) |
| Napa to Silver Springs Shores (Florida) | 2,380.70 mi (3,831.36 km) |
| Napa to Silverdale (Washington) | 647.61 mi (1,042.22 km) |
| Napa to Silverton (Oregon) | 463.96 mi (746.68 km) |
| Napa to Simi Valley (California) | 341.57 mi (549.71 km) |
| Napa to Simpsonville (South Carolina) | 2,219.99 mi (3,572.73 km) |
| Napa to Sioux City (Iowa) | 1,388.17 mi (2,234.04 km) |
| Napa to Sioux Falls (South Dakota) | 1,377.16 mi (2,216.32 km) |
| Napa to Skokie (Illinois) | 1,830.35 mi (2,945.66 km) |
| Napa to Sleepy Hollow (New York) | 2,548.69 mi (4,101.72 km) |
| Napa to Slidell (Louisiana) | 1,925.71 mi (3,099.13 km) |
| Napa to Smithfield (North Carolina) | 2,413.06 mi (3,883.45 km) |
| Napa to Smithfield (Utah) | 604.85 mi (973.41 km) |
| Napa to Smithville (Missouri) | 1,488.09 mi (2,394.86 km) |
