| Rusk | 53,000 | Henderson | Texas | Dallas-Fort Worth, TX | View → |
| Rusk | 14,500 | Ladysmith | Wisconsin | Madison-La Crosse, WI | View → |
| Russell | 17,500 | Russell Springs | Kentucky | Lexington-Bowling Green, KY | View → |
| Russell | 59,800 | Phenix City | Alabama | Macon-Columbus, GA | View → |
| Russell | 27,000 | Lebanon | Virginia | Tri-Cities, TN/VA | View → |
| Russell | 6,800 | Russell | Kansas | Wichita, KS | View → |
| Rutherford | 67,000 | Forest City | North Carolina | Greenville, SC-Asheville, NC | View → |
| Rutherford | 345,000 | Murfreesboro | Tennessee | Nashville, TN | View → |
| Rutland | 58,000 | Rutland | Vermont | Burlington, VT | View → |
| Sabine | 24,000 | Many | Louisiana | Shreveport, LA | View → |
| Sabine | 10,800 | Hemphill | Texas | Shreveport, LA | View → |
| Sac | 10,000 | Sac City | Iowa | Omaha, NE-Sioux City, IA | View → |
| Sacramento | 1,630,000 | Sacramento | California | Sacramento, CA | View → |
| Sagadahoc | 38,000 | Bath | Maine | Portland-Bangor, ME | View → |
| Saginaw | 190,000 | Saginaw | Michigan | Detroit, MI-Toledo, OH | View → |
| Saguache | 7,000 | Saguache | Colorado | Denver-Colorado Springs, CO | View → |
| Salem | 62,043 | Salem | New Jersey | Philadelphia, PA | View → |
| Salem City | 25,000 | Salem | Virginia | Roanoke-Harrisonburg, VA | View → |
| Saline | 23,000 | Marshall | Missouri | Kansas City, MO | View → |
| Saline | 14,000 | Crete | Nebraska | Lincoln, NE | View → |
| Saline | 125,000 | Benton | Arkansas | Little Rock, AR | View → |
| Saline | 23,500 | Harrisburg | Illinois | Paducah, KY | View → |
| Saline | 55,000 | Salina | Kansas | Wichita, KS | View → |
| Salt Lake | 1,200,000 | Salt Lake City | Utah | Salt Lake City, UT | View → |
| Saluda | 21,000 | Saluda | South Carolina | Savannah-Augusta, GA | View → |
| Sampson | 63,000 | Clinton | North Carolina | Raleigh-Greenville-Wilmington, NC | View → |
| San Augustine | 7,800 | San Augustine | Texas | Dallas-Fort Worth, TX | View → |
| San Benito | 68,500 | Hollister | California | Fresno, CA | View → |
| San Bernardino | 2,300,000 | San Bernardino | California | Los Angeles-San Diego, CA | View → |
| San Diego | 3,500,000 | San Diego | California | Los Angeles-San Diego, CA | View → |
| San Francisco | 870,000 | San Francisco | California | San Francisco, CA | View → |
| San Jacinto | 29,000 | Coldspring | Texas | Houston, TX | View → |
| San Joaquin | 830,000 | Stockton | California | Sacramento, CA | View → |
| San Juan | 122,000 | Farmington | New Mexico | Albuquerque, NM | View → |
| San Juan | 700 | Silverton | Colorado | Denver-Colorado Springs, CO | View → |
| San Juan | 15,300 | Monticello | Utah | Salt Lake City, UT | View → |
| San Juan | 18,000 | Friday Harbor | Washington | Seattle, WA | View → |
| San Luis Obispo | 290,000 | San Luis Obispo | California | Los Angeles-San Diego, CA | View → |
| San Mateo | 780,000 | Redwood City | California | San Francisco, CA | View → |
| San Miguel | 29,000 | Las Vegas | New Mexico | Albuquerque, NM | View → |
| San Miguel | 9,000 | Telluride | Colorado | Denver-Colorado Springs, CO | View → |
| San Patricio | 67,000 | Sinton | Texas | San Antonio-Corpus Christi, TX | View → |
| San Saba | 5,900 | San Saba | Texas | Austin-Waco, TX | View → |
| Sanborn | 2,400 | Woonsocket | South Dakota | Sioux Falls-Rapid City, SD | View → |
| Sanders | 13,000 | Thompson Falls | Montana | Missoula-Billings-Butte, MT | View → |
| Sandoval | 152,000 | Rio Rancho | New Mexico | Albuquerque, NM | View → |
| Sandusky | 59,000 | Fremont | Ohio | Detroit, MI-Toledo, OH | View → |
| Sangamon | 190,000 | Springfield | Illinois | Champaign-Peoria, IL | View → |
| Sanilac | 40,000 | Sandusky | Michigan | Detroit, MI-Toledo, OH | View → |
| Sanpete | 31,000 | Ephraim | Utah | Salt Lake City, UT | View → |
