| Alpena to Silver Firs (Washington) | 1,832.72 mi (2,949.48 km) |
| Alpena to Silver Spring (Maryland) | 532.99 mi (857.77 km) |
| Alpena to Silver Springs Shores (Florida) | 1,105.57 mi (1,779.24 km) |
| Alpena to Silverdale (Washington) | 1,859.29 mi (2,992.23 km) |
| Alpena to Silverton (Oregon) | 1,901.47 mi (3,060.12 km) |
| Alpena to Simi Valley (California) | 2,001.38 mi (3,220.91 km) |
| Alpena to Simpsonville (South Carolina) | 717.51 mi (1,154.73 km) |
| Alpena to Sioux City (Iowa) | 669.24 mi (1,077.03 km) |
| Alpena to Sioux Falls (South Dakota) | 664.86 mi (1,069.99 km) |
| Alpena to Skokie (Illinois) | 300.61 mi (483.78 km) |
| Alpena to Sleepy Hollow (New York) | 555.13 mi (893.39 km) |
| Alpena to Slidell (Louisiana) | 1,077.95 mi (1,734.79 km) |
| Alpena to Smithfield (North Carolina) | 712.60 mi (1,146.81 km) |
| Alpena to Smithfield (Utah) | 1,433.66 mi (2,307.25 km) |
| Alpena to Smithville (Missouri) | 690.80 mi (1,111.74 km) |
