| # | County | State | Population | Change since 2020 | Unemployment rate |
| 1 | Talbot County | Maryland | 38,244 | 1.9 % | 4.0 % |
| 2 | Talbot County | Georgia | 5,755 | 0.4 % | 4.5 % |
| 3 | Taliaferro County | Georgia | 1,620 | 4.0 % | 3.8 % |
| 4 | Talladega County | Alabama | 81,375 | -0.9 % | 3.2 % |
| 5 | Tallahatchie County | Mississippi | 10,921 | -14.1 % | 3.6 % |
| 6 | Tallapoosa County | Alabama | 40,699 | -1.5 % | 3.1 % |
| 7 | Tama County | Iowa | 16,738 | -2.1 % | 4.8 % |
| 8 | Taney County | Missouri | 56,744 | 1.2 % | 6.0 % |
| 9 | Tangipahoa Parish | Louisiana | 139,823 | 5.0 % | 5.0 % |
| 10 | Taos County | New Mexico | 34,482 | -0.0 % | 4.5 % |
| 11 | Tarrant County | Texas | 2,230,708 | 5.7 % | 3.9 % |
| 12 | Tate County | Mississippi | 28,551 | 1.7 % | 3.7 % |
| 13 | Tattnall County | Georgia | 24,275 | -0.0 % | 3.5 % |
| 14 | Taylor County | Texas | 148,813 | 3.9 % | 3.4 % |
| 15 | Taylor County | Kentucky | 26,809 | 3.1 % | 5.0 % |
| 16 | Taylor County | Florida | 21,843 | 0.2 % | 7.3 % |
| 17 | Taylor County | Wisconsin | 20,167 | 1.3 % | 3.9 % |
| 18 | Taylor County | West Virginia | 16,438 | -1.6 % | 4.1 % |
| 19 | Taylor County | Georgia | 7,783 | -0.4 % | 4.2 % |
| 20 | Taylor County | Iowa | 5,825 | -1.1 % | 2.4 % |
| 21 | Tazewell County | Illinois | 129,821 | -1.3 % | 4.5 % |
| 22 | Tazewell County | Virginia | 38,875 | -3.9 % | 5.1 % |
| 23 | Tehama County | California | 64,451 | -2.2 % | 6.5 % |
| 24 | Telfair County | Georgia | 11,000 | -11.8 % | 5.4 % |
| 25 | Teller County | Colorado | 24,862 | 0.6 % | 3.9 % |
| 26 | Tensas Parish | Louisiana | 3,844 | -7.3 % | 7.2 % |
| 27 | Terrebonne Parish | Louisiana | 103,864 | -5.2 % | 3.8 % |
| 28 | Terrell County | Georgia | 8,698 | -5.3 % | 5.3 % |
| 29 | Terrell County | Texas | 718 | -5.5 % | 3.4 % |
| 30 | Terry County | Texas | 11,602 | -1.9 % | 4.3 % |
| 31 | Teton County | Wyoming | 23,272 | -0.2 % | 2.4 % |
| 32 | Teton County | Idaho | 12,932 | 11.2 % | 2.6 % |
| 33 | Teton County | Montana | 6,444 | 3.5 % | 2.8 % |
| 34 | Texas County | Missouri | 25,715 | 5.0 % | 4.4 % |
| 35 | Texas County | Oklahoma | 20,577 | -3.8 % | 1.9 % |
| 36 | Thayer County | Nebraska | 4,870 | -3.3 % | 2.5 % |
| 37 | Thomas County | Georgia | 46,054 | 0.6 % | 3.2 % |
| 38 | Thomas County | Kansas | 7,802 | -1.6 % | 2.7 % |
| 39 | Thomas County | Nebraska | 634 | -5.7 % | 4.3 % |
| 40 | Throckmorton County | Texas | 1,532 | 6.3 % | 4.5 % |
| 41 | Thurston County | Washington | 302,912 | 2.8 % | 4.4 % |
| 42 | Thurston County | Nebraska | 6,637 | -2.0 % | 3.2 % |
| 43 | Tift County | Georgia | 41,708 | 0.8 % | 3.1 % |
| 44 | Tillamook County | Oregon | 27,264 | -0.4 % | 5.3 % |
| 45 | Tillman County | Oklahoma | 6,736 | -3.2 % | 3.9 % |
| 46 | Tioga County | New York | 47,574 | -1.8 % | 3.6 % |
| 47 | Tioga County | Pennsylvania | 40,698 | -0.8 % | 4.6 % |
| 48 | Tippah County | Mississippi | 21,423 | -1.8 % | 3.6 % |
| 49 | Tippecanoe County | Indiana | 191,650 | 2.9 % | 3.5 % |
| 50 | Tipton County | Tennessee | 62,187 | 2.0 % | 3.8 % |
| 51 | Tipton County | Indiana | 15,324 | -0.2 % | 3.7 % |
| 52 | Tishomingo County | Mississippi | 18,553 | -1.6 % | 3.8 % |
| 53 | Titus County | Texas | 31,547 | 1.0 % | 4.0 % |
| 54 | Todd County | Minnesota | 25,955 | 2.7 % | 5.3 % |
| 55 | Todd County | Kentucky | 12,757 | 4.2 % | 3.9 % |
| 56 | Todd County | South Dakota | 9,172 | -1.6 % | 5.6 % |
| 57 | Tom Green County | Texas | 120,103 | 0.1 % | 3.3 % |
| 58 | Tompkins County | New York | 105,602 | -0.1 % | 3.5 % |
| 59 | Tooele County | Utah | 84,488 | 16.2 % | 3.8 % |
| 60 | Toole County | Montana | 5,153 | 3.7 % | 2.8 % |
| 61 | Toombs County | Georgia | 27,488 | 1.7 % | 4.5 % |
| 62 | Torrance County | New Mexico | 15,986 | 6.2 % | 5.3 % |
| 63 | Towner County | North Dakota | 2,051 | -4.8 % | 3.0 % |
| 64 | Towns County | Georgia | 13,184 | 5.6 % | 3.6 % |
| 65 | Traill County | North Dakota | 7,989 | -0.0 % | 2.6 % |
| 66 | Transylvania County | North Carolina | 34,103 | 3.4 % | 3.7 % |
| 67 | Traverse County | Minnesota | 3,134 | -6.8 % | 3.4 % |
| 68 | Travis County | Texas | 1,363,767 | 5.7 % | 3.4 % |
| 69 | Treasure County | Montana | 739 | -2.6 % | 2.3 % |
| 70 | Trego County | Kansas | 2,774 | -1.1 % | 3.7 % |
| 71 | Trempealeau County | Wisconsin | 30,801 | 0.1 % | 3.5 % |
| 72 | Treutlen County | Georgia | 6,420 | 0.4 % | 4.4 % |
| 73 | Trigg County | Kentucky | 14,559 | 3.6 % | 4.8 % |
| 74 | Trimble County | Kentucky | 8,591 | 1.4 % | 4.3 % |
| 75 | Trinity County | California | 15,642 | -2.9 % | 5.9 % |
| 76 | Trinity County | Texas | 14,489 | 6.5 % | 5.1 % |
| 77 | Tripp County | South Dakota | 5,717 | 1.6 % | 1.6 % |
| 78 | Troup County | Georgia | 71,513 | 3.0 % | 3.0 % |
| 79 | Trousdale County | Tennessee | 12,159 | 4.7 % | 3.2 % |
| 80 | Trumbull County | Ohio | 200,300 | -0.9 % | 5.9 % |
| 81 | Tucker County | West Virginia | 6,573 | -2.8 % | 3.8 % |
| 82 | Tulare County | California | 483,546 | 2.2 % | 10.8 % |
| 83 | Tulsa County | Oklahoma | 693,514 | 3.6 % | 3.3 % |
| 84 | Tunica County | Mississippi | 9,157 | -6.4 % | 5.2 % |
| 85 | Tuolumne County | California | 53,893 | -3.1 % | 5.5 % |
| 86 | Turner County | South Dakota | 9,087 | 4.8 % | 2.0 % |
| 87 | Turner County | Georgia | 9,023 | 0.2 % | 4.0 % |
| 88 | Tuscaloosa County | Alabama | 241,212 | 5.7 % | 3.0 % |
| 89 | Tuscarawas County | Ohio | 92,048 | -1.3 % | 4.5 % |
| 90 | Tuscola County | Michigan | 52,757 | -1.1 % | 6.4 % |
| 91 | Twiggs County | Georgia | 7,728 | -3.7 % | 4.7 % |
| 92 | Twin Falls County | Idaho | 96,509 | 7.2 % | 3.4 % |
| 93 | Tyler County | Texas | 20,560 | 3.7 % | 5.9 % |
| 94 | Tyler County | West Virginia | 7,843 | -5.6 % | 5.3 % |
| 95 | Tyrrell County | North Carolina | 3,517 | 8.5 % | 5.4 % |