| Site | State | Type | Population |
|---|---|---|---|
| St. Tammany Parish, LA | Louisiana | County | 269388 |
| Stafford County, VA | Virginia | County | 156927 |
| Stafford, TX | Texas | City | 17364 |
| Stafford, VA | Virginia | City | 4320 |
| Stamford, CT | Connecticut | City | 136309 |
| Stanislaus County, CA | California | County | 552999 |
| Stanton, CA | California | City | 37970 |
| Stark County, OH | Ohio | County | 373834 |
| Starke, FL | Florida | City | 5796 |
| State College, PA | Pennsylvania | City | 39525 |
| Stateline, NV | Nevada | City | 932 |
| Staten Island, NY | New York | City | 475596 |
| Statesboro, GA | Georgia | City | 33399 |
| Statesville, NC | North Carolina | City | 27140 |
| Staunton, VA | Virginia | City | 25750 |
| Ste. Genevieve County, MO | Missouri | County | 17887 |
| Stearns County, MN | Minnesota | County | 154708 |
| Steelton, PA | Pennsylvania | City | 6263 |
| Sterling, VA | Virginia | City | 30872 |
| Steuben County, NY | New York | County | 93584 |
| Steubenville, OH | Ohio | City | 17962 |
| Stevens Point, WI | Wisconsin | City | 25692 |
| Stevenson Ranch, CA | California | City | 18980 |
| Stickney, IL | Illinois | City | 6963 |
| Stillwater, MN | Minnesota | City | 19292 |
| Stillwater, OK | Oklahoma | City | 48134 |
| Stockton, CA | California | City | 322020 |
| Stone Park, IL | Illinois | City | 4890 |
| Storm Lake, IA | Iowa | City | 11256 |
| Storrs, CT | Connecticut | City | 16392 |
| Stratford, CT | Connecticut | City | 52120 |
| Strongsville, OH | Ohio | City | 44675 |
| Stroudsburg, PA | Pennsylvania | City | 5950 |
| Stuart, FL | Florida | City | 17425 |
| Sturgeon Bay, WI | Wisconsin | City | 9706 |
| Sturgis, SD | South Dakota | City | 7103 |
| Suamico, WI | Wisconsin | City | 13078 |
| Suffolk County, NY | New York | County | 1532434 |
| Suffolk, VA | Virginia | City | 96194 |
| Sugar Land, TX | Texas | City | 109373 |
| Sugarloaf Township, PA | Pennsylvania | City | 3952 |
| Sullivan County, TN | Tennessee | County | 157707 |
| Sulphur, LA | Louisiana | City | 20641 |
| Summerville, SC | South Carolina | City | 51216 |
| Summit County, OH | Ohio | County | 541013 |
| Sumner County, TN | Tennessee | County | 200557 |
| Sumter County, SC | South Carolina | County | 104758 |
| Sumter, SC | South Carolina | City | 42976 |
| Sunny Isles Beach, FL | Florida | City | 22342 |
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