| Hennef to Silver Firs (Washington) | 4,991.04 mi (8,032.30 km) |
| Hennef to Silver Spring (Maryland) | 3,977.24 mi (6,400.75 km) |
| Hennef to Silver Springs Shores (Florida) | 4,659.41 mi (7,498.59 km) |
| Hennef to Silverdale (Washington) | 5,015.39 mi (8,071.49 km) |
| Hennef to Silverton (Oregon) | 5,176.64 mi (8,330.99 km) |
| Hennef to Simi Valley (California) | 5,706.86 mi (9,184.31 km) |
| Hennef to Simpsonville (South Carolina) | 4,390.32 mi (7,065.53 km) |
| Hennef to Sioux City (Iowa) | 4,532.19 mi (7,293.85 km) |
| Hennef to Sioux Falls (South Dakota) | 4,490.67 mi (7,227.04 km) |
| Hennef to Skokie (Illinois) | 4,246.98 mi (6,834.86 km) |
| Hennef to Sleepy Hollow (New York) | 3,756.82 mi (6,046.01 km) |
| Hennef to Slidell (Louisiana) | 4,913.88 mi (7,908.12 km) |
| Hennef to Smithfield (North Carolina) | 4,194.60 mi (6,750.56 km) |
| Hennef to Smithfield (Utah) | 5,063.62 mi (8,149.10 km) |
| Hennef to Smithville (Missouri) | 4,626.92 mi (7,446.30 km) |
