T
- Taft, California – William Howard Taft
- Talmadge, Maine – Benjamin Talmadge (landowner)
- Talmage, California – Junius Talmage (early settler)
- Tamworth, New Hampshire – British Admiral Washington Shirley, Viscount Tamworth
- Tancred, California – Tancred, Prince of Galilee
- Tarkington Prairie, Texas – Burton Tarkington (early settler)
- Tarpey, California – Arthur B. Tarpey
- Taylor, New York – Zachary Taylor
- Taylor County, Florida – Zachary Taylor, twelfth President of the United States of America
- Taylorville, California – Samuel P. Taylor (paper mill owner)
- Tecopa, California – Chief Tecopa (Paiute chief)
- Temple, New Hampshire – John Temple (lieutenant governor to colonial governor John Wentworth)
- Temple, Texas – Bernard Moore Temple (civil engineer)
- Terry, Montana – General Alfred Howe Terry
- Thetford, Vermont – Augustus Henry Fitzroy, 3rd Duke of Grafton, 4th Earl of Arlington and 4th Viscount Thetford
- Thomaston, Connecticut – Seth Thomas (clockmaker)
- Thomaston, Maine – General John Thomas of the Continental Army
- Thompson, Connecticut – Sir Robert Thompson (English landholder)
- Thorndike, Maine – Israel Thorndike (landowner)
- Thornton, Colorado – Governor Dan Thornton
- Thornton, New Hampshire – Dr. Matthew Thornton (signer of the Declaration of Independence)
- Tilton, New Hampshire – Nathaniel Tilton (iron foundry owner and hotelier)
- Tinley Park, Illinois – Samuel Tinley, Sr. (railroad station agent)
- Todd Valley, California – Dr. F. Walton Todd (store owner)
- Toms Place, California – Tom Yernby (resort owner)
- Tormey, California – Patrick Tormey (landowner)
- Torrance, California – Jared Sidney Torrance
- Towle, California – George and Allen Towle (local lumbermen)
- Townsend, Massachusetts – Charles Townshend (British cabinet minister) (note spelling)
- Townshend, Vermont – the Townshend family (powerful figures in British politics)
- Towson, Maryland – Ezekial Towson (hotelier)
- Trenton, New Jersey – William Trent (landholder)
- Trumbull, Connecticut – Jonathan Trumbull (governor of Connecticut)
- Truxton, New York – Commodore Thomas Truxton (naval officer of the American Revolution)
- Tuftonboro, New Hampshire – John Tufton Mason (owner of the town)
- Tully, New York – Marcus Tullius Cicero
- Tunbridge, Vermont – William Henry Nassau de Zuylestein, 4th Earl of Rochford, Viscount Tunbridge, Baron Enfield and Colchester
- Tupman, California – H.V. Tupman (landowner)
- Turner, Maine – Reverend Charles Turner (agent, later became minister of the town)
- Turners Falls, Massachusetts – Captain William Turner
- Tustin, California – Columbus Tustin
- Tuttle, California – R.H. Tuttle (railroad executive)
- Twain Harte, California – Mark Twain and Bret Harte
- Tyler, Texas – John Tyler
- Tyngsborough, Massachusetts – Colonel Jonathan Tyng (landowner)
- Tyringham, Massachusetts Jane Tyringham (married name Beresford) cousin of Sir Francis Bernard – only town in Massachusetts named after a woman. Sir Francis Bernard inherited Nether Winchendon House, Bucks., England from her.
Read more about this topic: List Of American Places Named After People