1850 Atlas
| Name | What | Place | Pop | Other |
| Smoky Hollow | PV | Claverack twp, Columbia Co, NY | ||
| Smoky Ordinary | PO | Brunswick Co, VA | ||
| Smut Eye | PO | Coffee Co, AL | ||
| Smyrna | PT | Chenango Co, NY | 1,927 | water by tributaries of Chenango river |
| Smyrna | PV | Kent Co, DE | water by tributaried of Duck creek | |
| Smyrna | PV | Harrison Co, OH | 93 | |
| Smyrna | PO | Ionia Co, MI | ||
| Smyrna | PO | Aroostock Co, ME | ||
| Smyrna | PO | Barnwell dist, SC | ||
| Smyrna | PO | Rutherford Co, TN | on Stone river | |
| Snapping Shoals | PO | Newton Co, GA | ||
| Snead's Ferry | PO | Onslow Co, NC | ||
| Sneedsville | PO | Hancock Co, TN | ||
| Snibar | PO | Lafayette Co, MO | ||
| Snickersville | PV | Loudoun Co, VA | ||
| Sniders | PO | Washington Co, KY | ||
| Snoddyville | V | Jefferson Co, TN | ||
| Snow Camp | PO | Orange Co, NC | ||
| Snow Creek | PO | Franklin Co, VA | ||
| Snow Creek | PO | Iredell Co, NC | ||
| Snow Creek | PO | Pickens dist, SC | ||
| Snow Creek | PO | Marshall Co, MS | ||
| Snow Falls | PO | Oxford Co, ME | ||
| Snow Hill | PV, CH | Worcester Co, MD | 714 | seat of justice, water by Pokomoke river |
| Snow Hill | PV, CH | Greene Co, NC | seat of justice, water by tributary of Neause river | |
| Snow Hill | PV | Clinton Co, OH | ||
| Snow Hill | PV | Walker Co, GA | ||
| Snow Hill | PV | Wilcox Co, AL | ||
| Snow Hill | PO | Hamilton Co, TN | ||
| Snow Shoe | PT | Centre Co, PA | ||
| Snow's Store | PO | Windsor Co, VT | ||
| Snowsville | PV | Choctaw Co, MS | ||
| Snyder | PV | Jefferson Co, PA | ||
| Snydersville | PO | Monroe Co, PA | ||
| Snydertown | PO | Northumberland Co, PA | ||
| Soap Creek | PO | Davis Co, WI | ||
| Soapstone Mountain | PO | Randolph Co, NC | ||
| Soccopatoy | PO | Coosa Co, AL | ||
| Social Circle | PO | Walton Co, GA | ||
| Sociality | PO | Dayton twp, Cattaraugus Co, NY | ||
| Society Hill | PV | Macon Co, AL | ||
| Society Hill | PV | Darlington dist, SC | ||
| Sodus | PT | Wayne Co, NY | ||
| Sodus Centre | PO | Sodus twp, Wayne Co, NY | ||
| Sodus Point | PV | Sodus twp, Wayne Co, NY | ||
| Solemn Grove | PO | Moore Co, NC | ||
| Solesbury | PT | Bucks Co, PA | ||
| Solitude | PO | Brazoria Co, TX | ||
| Solon | PT | Somerset Co, ME | ||
| Solon | PT | Cortland Co, NY | ||
| Solon | PO | Cuyahoga Co, OH | ||
| Solon | PO | Johnson Co, IA | ||
| Solon Mills | PO | McHenry Co, IL | ||
| Solsville | PO | Madison Co, NY | ||
| Somerfield | PO | Somerset Co, PA | ||
| Somerford | PT | Madison Co, OH | ||
| Somers | PT | Tolland Co, CT | ||
| Somers | PT | Westchester Co, NY | ||
| Somers | PT | Preble Co, OH | ||
| Somers Centre | PO | Somers twp, Westchester Co, NY | ||
| Somerset | PT | Bristol Co, MA | 1,166 | water by Taunton river |
| Somerset | T | Windham Co, VT | 321 | water by Deerfield & Moose rivers |
| Somerset | PT | Niagara Co, NY | 2,154 | water by Lake Ontario & Golden Hill creek |
| Somerset | PT | Washington Co, PA | 1,512 | |
| Somerset | PB, CH | Somerset twp, Somerset Co, PA | 866 | seat of justice, water by Cox's creek |
| Somerset | T | Somerset Co, PA | 1,554 | water by Laurel Hill, Middle & Cox's creeks |
| Somerset | PT, CH | Perry Co, OH | 1,240 | seat of justice |
| Somerset | PT | Belmont Co, OH | 1,943 | |
| Somerset | PV, CH | Pulaski Co, KY | seat of justice, | |
| Somerset | PT | Hillsdale Co, MI | 913 | |
| Somerset | PO | Monroe Co, MO | ||
| Somerset | PO | Wabash Co, IN | ||
| Somer's Point | PV | Atlantic Co, NJ | water by Great Egg Harbor bay | |
| Somersville | PO | Somers twp, Tolland Co, CT | ||
| Somersworth | PT | Strafford Co, NH | water by Salmon Fall & Cocheco rivers | |
| Somerton | PO | Moreland twp, Philadelphia Co, PA | ||
| Somerton | PV | Nansemond Co, VA | ||
| Somerton | PV | Somerset twp, Belmont Co, OH | water by south fork of Captina creek | |
| Somerville | PV | Rossie twp, St Lawrence Co, NY | ||
| Somerville | PV, CH | Somerset Co, NJ | seat of justice | |
| Somerville | PV | Fauquier Co, VA | ||
| Somerville | PV, CH | Morgan Co, AL | seat of justice | |
| Somerville | PV, CH | Fayette Co, TN | seat of justice | |
| Somerville | PV | Millford twp, Butler Co, OH | ||
| Somerville | PO | Middlesex Co, MA | ||
| Somonauk | PO | De Kalb Co, IL | ||
| Sonet | PO | Natchitoches parish, LA | ||
| Sonoma | PO | Sonoma Co, CA | ||
| Sonra | PO | Tuolumne Co, CA | ||
| Sookalena | PO | Benton Co, AL | ||
| Sooklena | PO | Lauderdale Co, AL | ||
| Sooy's Inn | PO | Burlington Co, NJ | ||
| Sopchoppy | PO | Wakulla Co, FL | ||
| Sorby | PO | Wayne Co, TN | ||
| Sorrel Horse | PO | Montgomery Co, PA | ||
| Souchahatchie | PO | Macon Co, AL |