| Gretna to Silver Firs (Washington) | 2,101.23 mi (3,381.60 km) |
| Gretna to Silver Spring (Maryland) | 970.70 mi (1,562.20 km) |
| Gretna to Silver Springs Shores (Florida) | 486.26 mi (782.56 km) |
| Gretna to Silverdale (Washington) | 2,118.29 mi (3,409.06 km) |
| Gretna to Silverton (Oregon) | 2,055.53 mi (3,308.05 km) |
| Gretna to Simi Valley (California) | 1,700.81 mi (2,737.19 km) |
| Gretna to Simpsonville (South Carolina) | 563.58 mi (906.99 km) |
| Gretna to Sioux City (Iowa) | 937.94 mi (1,509.47 km) |
| Gretna to Sioux Falls (South Dakota) | 1,010.87 mi (1,626.84 km) |
| Gretna to Skokie (Illinois) | 847.63 mi (1,364.14 km) |
| Gretna to Sleepy Hollow (New York) | 1,190.28 mi (1,915.57 km) |
| Gretna to Slidell (Louisiana) | 30.70 mi (49.40 km) |
| Gretna to Smithfield (North Carolina) | 781.91 mi (1,258.37 km) |
| Gretna to Smithfield (Utah) | 1,464.62 mi (2,357.08 km) |
| Gretna to Smithville (Missouri) | 703.50 mi (1,132.17 km) |
