1850 Atlas
| Name | What | Place | Pop | Other |
| Tracy | PO | Huntingdon Co, IN | ||
| Tracy's Landing | PO | Anne Arundel Co, MD | ||
| Tradersville | PO | Madison Co, OH | ||
| Trade's Hill | PO | Chatham Co, NC | ||
| Tranquillity | PO | Granville Co, NC | ||
| Tranquillity | PO | Sussex Co, NJ | ||
| Tranquillity | PO | Adams Co, OH | ||
| Tranquilla | PO | Jones Co, GA | ||
| Transit | PO | Genesee Co, NY | ||
| Transit Bridge | PO | Alleghany Co, NY | ||
| Trap Hill | PO | Wilkes Co, NC | ||
| Trappe | PV | Talbot Co, MD | ||
| Trappe | PV | Upper Providence twp, Montgomery Co, PA | ||
| Trask | PO | Grant Co, IN | ||
| Traveller's Repose | PO | Pocahontas Co, VA | ||
| Traveller's Repose | PO | Franklin Co, MO | ||
| Traveller's Rest | PO | Greenville dist, SC | ||
| Traveller's Rest | PV | Dolly Co, GA | ||
| Traveller's Rest | PO | Coosa Co, AL | ||
| Travis | PO | Austin Co, TX | ||
| Traylersville | PO | Henry Co, VA | ||
| Treadway | PO | Barnwell dist, SC | ||
| Treat's Mills | PO | Penobscot Co, ME | ||
| Tredypin | PT | Chester Co, PA | 1,727 | |
| Treibleville | PO | Monroe Co, PA | ||
| Treichlersville | PO | Lehigh Co, PA | ||
| Tremainville | PO | Lucas Co, OH | ||
| Tremont | PV, CH | Tazewell Co, IL | seat of justice | |
| Tremont | T | Buchanan Co, MO | ||
| Tremont | PO | Schuylkill Co, PA | ||
| Tremont | PO | Clark Co, OH | ||
| Trenton | PT | Hancock Co, ME | 1,207 | |
| Trenton | PT | Oneida Co, NY | 3,540 | water by Nine Mile & West Canada creeks, contains a series of cascades, known as Trenton falls |
| Trenton | City | Mercer Co, NJ | 6,466 | seat of justice, State Capital |
| Trenton | PV, CH | Jones Co, NC | seat of justice, water by Trent river | |
| Trenton | PV | Dade Co, GA | seat of justice | |
| Trenton | PV | Jackson Co, AL | ||
| Trenton | PT | Henry Co, IA | 1,000 | |
| Trenton | PV | Todd Co, KY | ||
| Trenton | PV | Madison twp, Butler Co, OH | ||
| Trenton | PT | Delaware Co, OH | 1,238 | |
| Trenton | PV, CH | Grundy Co, MO | seat of justice, water by east fork of Grand river | |
| Trenton | PO | Wayne Co, MI | ||
| Trenton | PO | Wachita parish, LA | ||
| Trenton | PO | Randolph Co, IN | ||
| Trenton | PV, CH | Gibson Co, TN | seat of justice, water by north fork of Forked Deer river | |
| Trenton Falls | PV | Trenton twp, Oneida Co, NY | water by West Canada creek at Trenton falls | |
| Trenton's Corners | PO | Dodge Co, WI | ||
| Trescot | PT | Washington Co, ME | 782 | water by Cobscook bay & Atlantic ocean |
| Trevillian's Depot | PO | Louisa Co, VA | ||
| Trevorton | PO | Northumberland Co, PA | ||
| Trexlertown | PV | Makungy twp, Lehigh Co, PA | ||
| Triadelphia | PV | Montgomery Co, MD | water by Patuxent river | |
| Triadelphia | PV | Ohio Co, VA | 248 | |
| Triadelphia | PO | Morgan Co, OH | ||
| Triana | PV | Madison Co, AL | water by Tennessee river | |
| Triangle | PT | Broome Co, NY | 1,728 | water by Ostelic & Toughnioga rivers |
| Tribes Hill | PO | Montgomery Co, NY | ||
| Trice's Store | PO | Orange Co, NC | ||
| Trier | PO | Bexar Co, TX | ||
| Trimble | PT | Athens Co, OH | water by Sunday creek | |
| Trinidad | PO | Trinity Co, CA | ||
| Trinity | PO | Catahoola parish, LA | ||
| Trinity | PO | Morgan Co, AL | ||
| Trinity Springs | PO | Martin Co, IN | ||
| Trion | PO | Jefferson Co, TN | ||
| Trion | PO | Tuscaloosa Co, AL | ||
| Trion Factory | PO | Chattooga Co, GA | ||
| Triplet | PO | Fleming Co, KY | ||
| Tripoli | PO | Tishomingo Co, MS | ||
| Triune | PO | Williamson Co, TN | ||
| Trivoli | PO | Peoria Co, IL | ||
| Trouble Hill | PO | Scott Co, AR | ||
| Troublesome | PV | Rockingham Co, NC | water by Troublesome creek | |
| Troublesome | PO | Clinch Co, GA | ||
| Troupsburgh | PT | Steuben Co, NY | 1,754 | water by Cowanesque creek |
| Troupville | PV, CH | Lowndes Co, GA | seat of justice | |
| Trousdale | PO | Warren Co, TN | ||
| Trout Creek | PO | Delaware Co, NY | ||
| Trout Creek | PO | St Clair Co, AL | ||
| Trout Run | PO | Jackson twp, Lycoming Co, PA | ||
| Troy | PT | Waldo Co, ME | 1,484 | water by tributaries of Sebasticook river |
| Troy | PT | Cheshire Co, NH | 759 | water by tributaries of Ashuelot river |
| Troy | PT | Orleans Co, VT | 1,008 | water by Missisque river |
| Troy | City | Rensselaer Co, NY | 28,785 | seat of justice, water by Hudson river |
| Troy | PT | Bradford Co, PA | 1,418 | water by tributaries of Susquehanna river |
| Troy | T | Crawford Co, PA | 740 | |
| Troy | PV, CH | Pike Co, AL | seat of justice | |
| Troy | PV | Yallabusha Co, MS | ||
| Troy | PV, CH | Obion Co, TN | seat of justice, water by tributary of Obion river | |
| Troy | PT, CH | Miami Co, OH | 1,954 | seat of justice, water by Great Miami river |
| Troy | T | Athens Co, OH | 1,421 | |
| Troy | T | Delaware Co, OH | 976 | |
| Troy | T | Geauga Co, OH | 1,164 | |
| Troy | T | Lorain Co, OH | ||
| Troy | T | Richland Co, OH | 1,544 | |
| Troy | T | Wood Co, OH | 559 | |
| Troy | PV, CH | Perry Co, IN | seat of justice, water by Ohio river | |
| Troy | PT | Fountain Co, IN | 1,139 | |
| Troy | PT | Oakland Co, MI | 1,427 | water by head waters of Red river |
| Troy | PT | Walworth Co, WI | ||
| Troy | PV, CH | Lincoln Co, ME | water by Cuivre river | |
| Troy | PO | Cherokee Co, GA | ||
| Troy | PO | Madison Co, IL | ||
| Troy | PO | Montgomery Co, NC | ||
| Troy | PO | Davis Co, IA | ||
| Troy | PO | Freestone Co, TX | ||
| Troy Centre | PO | Walworth Co, WI | ||
| Troy Grove | PO | La Salle Co, IL | ||
| Troy Lake | PO | Walworth Co, WI | ||
| Troy Mills | PO | Fulton Co, IL | ||
| Troy's Store | PO | Randolph Co, NC |