1850 Atlas
| Name | What | Place | Pop | Other |
| Summer Grove | PO | Smith Co, TX | ||
| Summer Hill | PT | Cayuga Co, NY | 1,251 | water by head waters of Fall creek |
| Summer Hill | PO | Crawford Co, PA | ||
| Summer Hill | PT | Cambria Co, PA | 1,497 | |
| Summer Hill | PO | Stoddard Co, MO | ||
| Summerfield | PV | Guilford Co, NC | ||
| Summerfield | PO | Seneca twp, Monroe Co, OH | ||
| Summerfield | PT | Monroe Co, MI | water by Raisin river | |
| Summerfield | PO | Dallas Co, AL | ||
| Summerford | PO | Madison Co, OH | ||
| Summerset | PO | Polk Co, IA | ||
| Summersville | PV | Greene Co, KY | ||
| Summersville | PO | Jefferson Co, PA | ||
| Summersville | PV | Charleston dist, SC | ||
| Summersville | PV, CH | Chattooga Co, GA | seat of justice, water by Chattooga river | |
| Summersville | PO | Cumberland Co, NC | ||
| Summersville | PO | Cass Co, MI | water by Dowagiake river | |
| Summersville | PO | Rock Co, WI | ||
| Summersville | PO | Boone Co, MO | ||
| Summit | PO | Oakland Co, MI | ||
| Summit | PT | Schoharie Co, NY | 1,800 | water by Charlotte river & tributaries of Schoharie creek |
| Summit | PV | Washington twp, Cambria Co, PA | 406 | water by tributary of Kiskiminetas river |
| Summit | PO | Northampton Co, NC | ||
| Summit | PO | Summit Co, OH | ||
| Summit | PT | Waukesha Co, WI | ||
| Summit | PO | Blount Co, AL | ||
| Summit | PO | Whitley Co, IN | ||
| Summit | PO | Essex Co, NJ | ||
| Summit Bridge | PV | New Castle Co, DE | ||
| Summit Hill | PV | Carbon Co, PA | ||
| Summit Mills | PO | Somerset Co, PA | ||
| Summit Pint | PO | Jefferson Co, VA | ||
| Summitville | PO | Lee Co, IA | ||
| Summitville | PO | Madison Co, IN | ||
| Summum | PO | Fulton Co, IL | ||
| Sumner | PT | Oxford Co, ME | 1,151 | water by tributaries of Androscoggin river |
| Sumneytown | PV | Montgomery Co, PA | ||
| Sumptions Prairie | PO | St Joseph's Co, IN | ||
| Sumter | T | Wayne Co, MI | 434 | |
| Sumter | PO | Trinity Co, TX | ||
| Sumterville | PV | Sumter dist, SC | ||
| Sumterville | PV | Lee Co, GA | ||
| Sumterville | PO | Sumter Co, AL | water by Tombigbee river | |
| Sun | PO | St Tammany parish, LA | ||
| Sunbury | PB | Augusta twp, Northumberland Co, PA | 1,218 | seat of justice, water by Susquehanna river & Pennsylvania canal |
| Sunbury | PV | Gates Co, NC | ||
| Sunbury | PV | Berkshire twp, Delaware Co, OH | ||
| Sunbury | PT | Monroe Co, OH | 1,257 | |
| Sunbury | PV | Livingston Co, IL | ||
| Sunbury | V | Liberty Co, GA | water by Medway river & St Catherine's sound | |
| Suncook | PV | Merrimack Co, NH | ||
| Sunday Creek Cross Roads | PO | Perry Co, OH | ||
| Sunderland | PT | Bennington Co, VT | 479 | water by Batten kill & Roaring brook |
| Sunderland | PT | Franklin Co, MA | 792 | water by Connecticut river |
| Sunfish | PO | Clarington village, Salem twp, Monroe Co, OH | ||
| Sunfish | T | Pike Co, OH | 371 | |
| Sunkhaze | PO | Penobscot Co, ME | ||
| Sunny Side | PO | Lowndes Co, AL | ||
| Sun Prairie | PO | Dane Co, WI | ||
| Sunrise | PO | Bath Co, VA | ||
| Sunville | PO | Venango Co, PA | ||
| Superior | T | Williams Co, OH | 723 | |
| Superior | PT | Washtensaw Co, MI | 1,127 | |
| Surgeon's Hill | PO | Alleghany Co, PA | ||
| Surrency's | PO | Tatnall Co, GA | ||
| Surrounded Hills | PT | Monroe Co, AR | ||
| Surry | PT | Hancock Co, ME | 1,189 | water by Union river & Union bay |
| Surry | PT | Cheshire Co, NH | 556 | water by Ashuelot river |
| Surry | PV, CH | Surry Co, VA | seat of justice | |
| Suspension Bridge | PO | Niagara Co, NY | ||
| Susquehanna | PO | Colesville twp, Broome Co, NY | ||
| Susquehanna | PT | Dauphin Co, PA | 1,535 | water by Paxton creek |
| Susquehanna | T | Lycoming Co, PA | 406 | |
| Susquehanna | PO | Cambria Co, PA | 640 | |
| Susquehanna Depot | PO | Susquehanna Co, PA | ||
| Sussex | PC, CH | Sussex Co, VA | seat of justice | |
| Sussex | PO | Waukesha Co, WI | ||
| Sutton | PT | Merrimack Co, NH | 1,387 | water by tributaries of Warner river |
| Sutton | PT | Caledonia Co, VT | 1,001 | water by tributarie of Pasumpsic river |
| Sutton | PT | Worcester Co, MA | 1,816 | water by Blackstone river |
| Sutton | PT | Meigs Co, OH | 1,596 | |
| Sutton's | PO | Williamsburgh dist, SC | ||
| Sutton's Mills | PO | Essex Co, MA | ||
| Sutton's Point | PO | Clay Co, IL | ||
| Suwanee | PO | Gwinnett Co, GA | ||
| Suwanee Shoals | PO | Columbia Co, FL | ||
| Swainsborough | PV, CH | Emanuel Co, GA | seat of justice, water by Cannouchee river | |
| Swampscot | PT | Essex Co, MA | ||
| Swan | PT | Hocking Co, OH | ||
| Swan | PT | Noble Co, IN | 568 | |
| Swan | T | Taney Co, MO | ||
| Swan Creek | PO | Gallia Co, OH | ||
| Swan Creek | PO | Warren Co, IL | ||
| Swan Creek | T | Lucas Co, OH | ||
| Swan Creek | PO | Warren Co, KY | ||
| Swan Lake | PO | Carroll parish, LA | ||
| Swan Lake | PO | Arkansas Co, AR | ||
| Swan Point | PO | Knox Co, KY | ||
| Swan Pond | PO | Wilkes Co, NC | ||
| Swan Quarter | not listed, CH | Hyde Co, NC | seat of justice | |
| Swancy's Ferry | PO | Abbeville dist, SC | ||
| Swangstown | PV | Cleveland Co, NC | ||
| Swannano | PO | Buncombe Co, NC | ||
| Swansborough | PV | Onslow Co, NC | water by Whittock river | |
| Swansonville | PO | Pittsylvania Co, VA | ||
| Swanton | PT | Franklin Co, VT | 2,824 | water by Lake Champlain & Missisque river |
| Swanton | PV | Lucas Co, OH | ||
| Swanton Centre | PO | Swanton twp, Franklin Co, VT | ||
| Swanville | PT | Waldo Co, ME | 944 | |
| Swanville | PO | Jefferson Co, IN | ||
| Swanzey | PT | Bristol Co, MA | 1,554 | water by Mount Hope bay |
| Swanzey | PT | Cheshire Co, NH | 2,106 | water by Ashuelot river |
| Swartswood | PO | Sussex Co, NJ | ||
| Swartwout | PO | Liberty Co, TX | ||
| Swartz Creek | PO | Genesee Co, MI | ||
| Swatara | PT | Lebanon Co, PA | 1,843 | water by Swatara creek |
| Swearingens | PO | Austin Co, TX | ||
| Swedne | PT | Oxford Co, ME | 696 | |
| Sweden | PB | Potter Co, PA | 254 | |
| Sweden | PT | Monroe Co, NY | 3,623 | water by Salmon creek |
| Sweedlin Hill | PO | Pendleton Co, VA | ||
| Sweedsborough | PV | Woolwich twp, Gloucester Co, PA | water by Raccoon creek | |
| Sweet Air | PO | Baltimore Co, MD | ||
| Sweet Home | PO | Nodaway Co, MO | ||
| Sweet Home | T | Clark Co, MO | ||
| Sweet Springs | PV | Monroe Co, VA | ||
| Sweet Valley | PO | Luzerne Co, PA | ||
| Sweet Water | PO | Marengo Co, AL | ||
| Sweet Water | PO | Gwinnett Co, GA | ||
| Sweet Water | PO | Monroe Co, TN | ||
| Sweet Water | PO | Watauga Co, NC | ||
| Sweet Water | PO | Menard Co, IL | ||
| Sweet Water Factory | PO | Campbell Co, GA | ||
| Sweetland | PO | Muscatine Co, IA | ||
| Swift Creek | PO | Darlington dist, SC | ||
| Swift Creek | PO | Craven Co, NC | ||
| Swift Island | PO | Montgomery Co, NC | ||
| Swineyyards | PO | Charles City Co, VA | ||
| Swinton | PO | Kane Co, IL | ||
| Switzerland | T | Monroe Co, OH | 1,216 | |
| Sybertaville | PO | Luzerne Co, PA | ||
| Sycamore | PT | Wyandott Co, OH | 1,109 | |
| Sycamore | PT | Hamilton Co, OH | 3,731 | water by Mill creek |
| Sycamore | PO | Claiborne Co, TN | ||
| Sycamore | PV, CH | De Kalb Co, IL | seat of justice | |
| Sycamore Alley | PO | Halifax Co, NC | ||
| Sycamore Grove | PO | Overton Co, TN | ||
| Sycamore Mills | PO | Davidson Co, TN | ||
| Sydnorsville | PO | Franklin Co, VA | ||
| Sykesville | PV | Carroll Co, MD | ||
| Sylacauga | PO | Talladega Co, AL | ||
| Sylamore | PO | Izard Co, AR | ||
| Sylco | PO | Polk Co, TN | ||
| Sylva | PO | Washington Co, AR | ||
| Sylvan | PO | Washtenaw Co, MI | ||
| Sylvan | PO | Franklin Co, PA | ||
| Sylan Dale | PO | Hancock Co, IL | ||
| Sylvan Grove | PO | Jefferson Co, GA | ||
| Sylvan Grove | PO | Clarke Co, IN | ||
| Sylvania | PO | Bradford Co, PA | ||
| Sylvania | PO | Racine Co, WI | ||
| Sylvania | PV, CH | Scriven Co, GA | ||
| Sylvania | T | Lucas Co, OH | 751 | |
| Sylvania | PO | Licking Co, OH | ||
| Sylvania | PO | Parke Co, IN | ||
| Sylvanus | PO | Hillsdale Co, MI | ||
| Sylvia | PO | Hardin Co, OH | ||
| Symmes | PT | Hamilton Co, OH | 1,115 | water by Little Miami river |
| Symmes | T | Lawrence Co, OH | 487 | water by Symmes creek |
| Symmes' Corners | PO | Butler Co, OH | ||
| Symmes' Creek | PO | Muskingum Co, OH | ||
| Symsonia | PO | Graves Co, KY | ||
| Syracuse | City, CH | Salina twp, Onondaga Co, NY | 25,251 | seat of justice |
| Syracuse | PV | Kosciusko Co, IN |