| Porsgrunn to Silver Firs (Washington) | 4,560.78 mi (7,339.86 km) |
| Porsgrunn to Silver Spring (Maryland) | 3,851.65 mi (6,198.64 km) |
| Porsgrunn to Silver Springs Shores (Florida) | 4,571.83 mi (7,357.65 km) |
| Porsgrunn to Silverdale (Washington) | 4,583.47 mi (7,376.38 km) |
| Porsgrunn to Silverton (Oregon) | 4,753.23 mi (7,649.59 km) |
| Porsgrunn to Simi Valley (California) | 5,342.87 mi (8,598.53 km) |
| Porsgrunn to Simpsonville (South Carolina) | 4,261.51 mi (6,858.24 km) |
| Porsgrunn to Sioux City (Iowa) | 4,259.89 mi (6,855.63 km) |
| Porsgrunn to Sioux Falls (South Dakota) | 4,209.91 mi (6,775.20 km) |
| Porsgrunn to Skokie (Illinois) | 4,029.32 mi (6,484.56 km) |
| Porsgrunn to Sleepy Hollow (New York) | 3,634.53 mi (5,849.21 km) |
| Porsgrunn to Slidell (Louisiana) | 4,761.61 mi (7,663.08 km) |
| Porsgrunn to Smithfield (North Carolina) | 4,087.42 mi (6,578.07 km) |
| Porsgrunn to Smithfield (Utah) | 4,707.87 mi (7,576.59 km) |
| Porsgrunn to Smithville (Missouri) | 4,384.96 mi (7,056.92 km) |
