| Formia to Silver Firs (Washington) | 5,711.15 mi (9,191.21 km) |
| Formia to Silver Spring (Maryland) | 4,552.06 mi (7,325.83 km) |
| Formia to Silver Springs Shores (Florida) | 5,191.69 mi (8,355.21 km) |
| Formia to Silverdale (Washington) | 5,735.76 mi (9,230.82 km) |
| Formia to Silverton (Oregon) | 5,895.20 mi (9,487.41 km) |
| Formia to Simi Valley (California) | 6,405.44 mi (10,308.56 km) |
| Formia to Simpsonville (South Carolina) | 4,960.08 mi (7,982.48 km) |
| Formia to Sioux City (Iowa) | 5,193.76 mi (8,358.55 km) |
| Formia to Sioux Falls (South Dakota) | 5,157.12 mi (8,299.58 km) |
| Formia to Skokie (Illinois) | 4,879.88 mi (7,853.40 km) |
| Formia to Sleepy Hollow (New York) | 4,333.51 mi (6,974.11 km) |
| Formia to Slidell (Louisiana) | 5,492.87 mi (8,839.92 km) |
| Formia to Smithfield (North Carolina) | 4,751.41 mi (7,646.66 km) |
| Formia to Smithfield (Utah) | 5,761.49 mi (9,272.22 km) |
| Formia to Smithville (Missouri) | 5,270.25 mi (8,481.64 km) |
