| Totten (21,365) | Tovar (53,942) | Tower (19,823) |
| Towers (13,312) | Towle (18,198) | Town (14,644) |
| Towne (23,552) | Towner (11,626) | Townes (10,567) |
| Townley (12,732) | Towns (25,149) | Townsend (279,246) |
| Toy (15,510) | Tracey (41,390) | Tracy (143,376) |
| Trader (9,802) | Trahan (30,550) | Trail (10,244) |
| Trainer (15,493) | Trainor (25,542) | Trammel (9,892) |
| Trammell (31,158) | Tran (329,477) | Trapp (30,019) |
| Trask (24,708) | Trautman (9,856) | Traver (15,197) |
| Travers (27,143) | Travis (130,671) | Traylor (36,308) |
| Traynor (10,342) | Treadway (22,870) | Treadwell (19,418) |
| Treat (17,537) | Trejo (65,150) | Tremblay (18,168) |
| Trent (60,780) | Trevino (121,954) | Tribble (18,249) |
| Trice (28,206) | Trigg (11,627) | Trimble (60,326) |
| Trimmer (11,653) | Trinh (22,395) | Trinidad (20,470) |
| Triplett (52,135) | Tripp (83,379) | Trombley (17,964) |
| Trott (13,938) | Trotter (64,308) | Troup (12,508) |
| Trout (51,804) | Troutman (37,681) | Trowbridge (28,655) |
| Troxell (14,065) | Troy (35,109) | Troyer (22,470) |
| Truax (21,349) | Trudeau (13,443) | True (30,489) |
| Truesdale (11,543) | Truitt (30,956) | Trujillo (153,133) |
| Truman (24,145) | Trump (13,016) | Truong (59,802) |
| Trussell (13,123) | Trusty (10,227) | Tryon (17,197) |
| Tsai (20,041) | Tubbs (47,699) | Tuck (34,263) |
| Tucker (698,256) | Tudor (17,124) | Tufts (12,032) |
| Tuggle (19,853) | Tull (20,645) | Tullis (12,669) |
| Tully (36,560) | Tupper (14,527) | Turcotte (11,600) |
| Turk (33,695) | Turley (34,264) | Turman (12,136) |
| Turnage (13,918) | Turnbull (30,285) | Turner (1,471,773) |
| Turney (27,841) | Turpin (39,761) | Tuthill (11,894) |
| Tutt (10,634) | Tuttle (120,818) | Tweedy (10,482) |
| Tyler (265,527) | Tyndall (9,879) | Tyner (20,338) |
| Tyree (25,459) | Tyrrell (18,565) | Tyson (96,917) |
