| Portishead to Silver Firs (Washington) | 4,695.81 mi (7,557.18 km) |
| Portishead to Silver Spring (Maryland) | 3,552.18 mi (5,716.68 km) |
| Portishead to Silver Springs Shores (Florida) | 4,226.79 mi (6,802.36 km) |
| Portishead to Silverdale (Washington) | 4,721.32 mi (7,598.23 km) |
| Portishead to Silverton (Oregon) | 4,874.40 mi (7,844.60 km) |
| Portishead to Simi Valley (California) | 5,360.38 mi (8,626.70 km) |
| Portishead to Simpsonville (South Carolina) | 3,964.58 mi (6,380.37 km) |
| Portishead to Sioux City (Iowa) | 4,147.82 mi (6,675.28 km) |
| Portishead to Sioux Falls (South Dakota) | 4,110.11 mi (6,614.59 km) |
| Portishead to Skokie (Illinois) | 3,844.26 mi (6,186.75 km) |
| Portishead to Sleepy Hollow (New York) | 3,331.89 mi (5,362.16 km) |
| Portishead to Slidell (Louisiana) | 4,491.23 mi (7,227.94 km) |
| Portishead to Smithfield (North Carolina) | 3,765.69 mi (6,060.29 km) |
| Portishead to Smithfield (Utah) | 4,716.60 mi (7,590.64 km) |
| Portishead to Smithville (Missouri) | 4,230.42 mi (6,808.20 km) |
