| Portage to Silver Firs (Washington) | 1,809.61 mi (2,912.28 km) |
| Portage to Silver Spring (Maryland) | 500.59 mi (805.62 km) |
| Portage to Silver Springs Shores (Florida) | 926.02 mi (1,490.29 km) |
| Portage to Silverdale (Washington) | 1,834.74 mi (2,952.73 km) |
| Portage to Silverton (Oregon) | 1,854.38 mi (2,984.34 km) |
| Portage to Simi Valley (California) | 1,867.88 mi (3,006.07 km) |
| Portage to Simpsonville (South Carolina) | 546.69 mi (879.81 km) |
| Portage to Sioux City (Iowa) | 551.48 mi (887.52 km) |
| Portage to Sioux Falls (South Dakota) | 571.23 mi (919.31 km) |
| Portage to Skokie (Illinois) | 110.74 mi (178.21 km) |
| Portage to Sleepy Hollow (New York) | 609.34 mi (980.64 km) |
| Portage to Slidell (Louisiana) | 855.20 mi (1,376.31 km) |
| Portage to Smithfield (North Carolina) | 603.86 mi (971.82 km) |
| Portage to Smithfield (Utah) | 1,341.65 mi (2,159.18 km) |
| Portage to Smithville (Missouri) | 508.07 mi (817.67 km) |
