| Anderson County | 7 | 7,808 | Palestine ISD, Westwood ISD, Elkhart ISD, Frankston ISD, Cayuga ISD, Neches ISD, Slocum ISD |
| Andrews County | 1 | 4,209 | Andrews ISD |
| Angelina County | 6 | 14,588 | Lufkin ISD, Hudson ISD, Diboll ISD, Huntington ISD, Central ISD, Zavalla ISD |
| Aransas County | 1 | 2,913 | Rockport-Fulton ISD |
| Archer County | 3 | 2,110 | Holliday ISD, Windthorst ISD, Archer City ISD |
| Armstrong County | 1 | 297 | Claude ISD |
| Atascosa County | 4 | 5,640 | Poteet ISD, Lytle ISD, Jourdanton ISD, Charlotte ISD |
| Austin County | 3 | 6,290 | Sealy ISD, Bellville ISD, Brazos ISD |
| Bailey County | 1 | 1,330 | Muleshoe ISD |
| Bandera County | 2 | 2,461 | Bandera ISD, Medina ISD |
| Bastrop County | 4 | 21,555 | Bastrop ISD, Elgin ISD, Smithville ISD, McDade ISD |
| Baylor County | 1 | 594 | Seymour ISD |
| Bee County | 4 | 4,815 | Beeville ISD, Skidmore-Tynan ISD, Pawnee ISD, Pettus ISD |
| Bell County | 10 | 73,476 | Killeen ISD, Belton ISD, Temple ISD, Salado ISD, Academy ISD, Troy ISD, Rogers ISD, Holland ISD, Bartlett ISD, Highland ISD |
| Bexar County | 15 | 296,560 | All 15 Bexar County districts → |
| Blanco County | 2 | 1,809 | Blanco ISD, Johnson City ISD |
| Borden County | 1 | 249 | Borden County ISD |
| Bosque County | 7 | 2,136 | Clifton ISD, Meridian ISD, Kopperl ISD, Walnut Springs ISD, Iredell ISD, Morgan ISD, Cranfills Gap ISD |
| Bowie County | 13 | 17,435 | Texarkana ISD, Pleasant Grove ISD, Liberty-Eylau ISD, New Boston ISD, Redwater ISD, Hooks ISD, Dekalb ISD, Red Lick ISD, Simms ISD, Maud ISD, Malta ISD, Leary ISD, Hubbard ISD |
| Brazoria County | 8 | 74,745 | Alvin ISD, Pearland ISD, Brazosport ISD, Angleton ISD, Columbia-Brazoria ISD, Sweeny ISD, Danbury ISD, Damon ISD |
| Brazos County | 2 | 30,358 | Bryan ISD, College Station ISD |
| Brewster County | 4 | 1,093 | Alpine ISD, Terlingua CSD, Marathon ISD, San Vicente ISD |
| Briscoe County | 2 | 384 | Silverton ISD, Turkey-Quitaque ISD |
| Brooks County | 1 | 1,180 | Brooks County ISD |
| Brown County | 7 | 6,109 | Brownwood ISD, Early ISD, Bangs ISD, May ISD, Brookesmith ISD, Zephyr ISD, Blanket ISD |
| Burleson County | 3 | 3,128 | Caldwell ISD, Snook ISD, Somerville ISD |
| Burnet County | 2 | 7,210 | Marble Falls ISD, Burnet CISD |
| Caldwell County | 3 | 8,463 | Lockhart ISD, Luling ISD, Prairie Lea ISD |
| Calhoun County | 1 | 3,514 | Calhoun County ISD |
| Callahan County | 4 | 2,608 | Clyde CISD, Eula ISD, Cross Plains ISD, Baird ISD |
| Cameron County | 9 | 79,492 | Brownsville ISD, Harlingen CISD, Los Fresnos CISD, San Benito CISD, La Feria ISD, Point Isabel ISD, Rio Hondo ISD, Santa Rosa ISD, Santa Maria ISD |
| Camp County | 2 | 5,651 | Pleasanton ISD, Pittsburg ISD |
| Carson County | 3 | 1,072 | Panhandle ISD, White Deer ISD, Groom ISD |
| Cass County | 7 | 5,268 | Atlanta ISD, Hughes Springs ISD, Queen City ISD, Linden-Kildare CISD, McLeod ISD, Bloomburg ISD, Avinger ISD |
| Castro County | 3 | 1,526 | Dimmitt ISD, Nazareth ISD, Hart ISD |
| Chambers County | 3 | 10,989 | Barbers Hill ISD, East Chambers ISD, Anahuac ISD |
| Cherokee County | 6 | 10,948 | Jacksonville ISD, Bullard ISD, Rusk ISD, New Summerfield ISD, Alto ISD, Wells ISD |
| Childress County | 1 | 978 | Childress ISD |
| Clay County | 4 | 1,767 | Henrietta ISD, Petrolia CISD, Bellevue ISD, Midway ISD |
| Cochran County | 2 | 666 | Morton ISD, Whiteface CISD |
| Coke County | 2 | 501 | Robert Lee ISD, Bronte ISD |
| Coleman County | 3 | 1,218 | Coleman ISD, Santa Anna ISD, Panther Creek CISD |
| Collin County | 14 | 248,875 | All 14 Collin County districts → |
| Collingsworth County | 1 | 534 | Wellington ISD |
| Colorado County | 3 | 3,697 | Columbus ISD, Rice CISD, Weimar ISD |
| Comal County | 2 | 39,732 | Comal ISD, New Braunfels ISD |
| Comanche County | 4 | 2,274 | Comanche ISD, De Leon ISD, Gustine ISD, Sidney ISD |
| Concho County | 2 | 521 | Paint Rock ISD, Eden CISD |
| Cooke County | 8 | 6,824 | Gainesville ISD, Callisburg ISD, Valley View ISD, Muenster ISD, Lindsay ISD, Era ISD, Walnut Bend ISD, Sivells Bend ISD |
| Coryell County | 4 | 10,864 | Copperas Cove ISD, Gatesville ISD, Oglesby ISD, Evant ISD |
| Cottle County | 1 | 156 | Paducah ISD |
| Crane County | 1 | 1,233 | Crane ISD |
| Crockett County | 1 | 621 | Crockett County Consolidated CSD |
| Crosby County | 3 | 893 | Ralls ISD, Crosbyton CISD, Lorenzo ISD |
| Culberson County | 1 | 381 | Culberson County-Allamoore ISD |
| Dallam County | 2 | 2,071 | Dalhart ISD, Texline ISD |
| Dallas County | 15 | 405,017 | All 15 Dallas County districts → |
| Dawson County | 4 | 2,117 | Lamesa ISD, Klondike ISD, Sands CISD, Dawson ISD |
| Deaf Smith County | 2 | 4,110 | Hereford ISD, Walcott ISD |
| Delta County | 1 | 903 | Cooper ISD |
| Denton County | 11 | 144,462 | All 11 Denton County districts → |
| DeWitt County | 5 | 2,839 | Cuero ISD, Yorktown ISD, Meyersville ISD, Nordheim ISD, Westhoff ISD |
| Dickens County | 2 | 280 | Spur ISD, Patton Springs ISD |
| Dimmit County | 1 | 1,852 | Carrizo Springs CISD |
| Donley County | 2 | 496 | Clarendon ISD, Hedley ISD |
| Duval County | 4 | 2,346 | San Diego ISD, Freer ISD, Benavides ISD, Ramirez CSD |
| Eastland County | 5 | 2,515 | Eastland ISD, Cisco ISD, Ranger ISD, Gorman ISD, Rising Star ISD |
| Ector County | 1 | 33,663 | Ector County ISD |
| Edwards County | 2 | 440 | Nueces Canyon CISD, Rocksprings ISD |
| El Paso County | 9 | 150,915 | El Paso ISD, Socorro ISD, Ysleta ISD, Clint ISD, Canutillo ISD, San Elizario ISD, Fabens ISD, Tornillo ISD, Anthony ISD |
| Ellis County | 10 | 42,667 | Midlothian ISD, Waxahachie ISD, Red Oak ISD, Ennis ISD, Ferris ISD, Palmer ISD, Maypearl ISD, Italy ISD, Avalon ISD, Milford ISD |
| Erath County | 7 | 5,858 | Stephenville ISD, Dublin ISD, Huckabay ISD, Lingleville ISD, Bluff Dale ISD, Three Way ISD, Morgan Mill ISD |
| Falls County | 4 | 2,358 | Marlin ISD, Rosebud-Lott ISD, Chilton ISD, Westphalia ISD |
| Fannin County | 9 | 5,664 | Bonham ISD, Leonard ISD, Trenton ISD, Honey Grove ISD, Sam Rayburn ISD, Dodd City ISD, Savoy ISD, Ector ISD, Fannindel ISD |
| Fayette County | 5 | 3,755 | La Grange ISD, Schulenburg ISD, Flatonia ISD, Fayetteville ISD, Round Top-Carmine ISD |
| Fisher County | 2 | 570 | Roby CISD, Rotan ISD |
| Floyd County | 2 | 1,062 | Floydada Collegiate ISD, Lockney ISD |
| Foard County | 1 | 189 | Crowell ISD |
| Fort Bend County | 5 | 229,702 | Katy ISD, Fort Bend ISD, Lamar CISD, Needville ISD, Stafford Msd |
| Franklin County | 1 | 1,608 | Mount Vernon ISD |
| Freestone County | 4 | 3,520 | Fairfield ISD, Teague ISD, Wortham ISD, Dew ISD |
| Frio County | 2 | 2,794 | Pearsall ISD, Dilley ISD |
| Gaines County | 3 | 3,764 | Seminole ISD, Seagraves ISD, Loop ISD |
| Galveston County | 8 | 78,980 | Clear Creek ISD, Dickinson ISD, Texas City ISD, Galveston ISD, Friendswood ISD, Santa Fe ISD, Hitchcock ISD, High Island ISD |
| Garza County | 2 | 818 | Post ISD, Southland ISD |
| Gillespie County | 3 | 3,641 | Fredericksburg ISD, Harper ISD, Doss Consolidated CSD |
| Glasscock County | 1 | 293 | Glasscock County ISD |
| Goliad County | 1 | 1,244 | Goliad ISD |
| Gonzales County | 3 | 3,875 | Gonzales ISD, Nixon-Smiley CISD, Waelder ISD |
| Gray County | 4 | 3,545 | Pampa ISD, McLean ISD, Lefors ISD, Grandview-Hopkins ISD |
| Grayson County | 13 | 25,810 | All 13 Grayson County districts → |
| Gregg County | 7 | 22,785 | Longview ISD, Pine Tree ISD, Kilgore ISD, Spring Hill ISD, Gladewater ISD, Sabine ISD, White Oak ISD |
| Grimes County | 4 | 4,971 | Navasota ISD, Anderson-Shiro CISD, Iola ISD, Richards ISD |
| Guadalupe County | 4 | 26,648 | Schertz-Cibolo-U City ISD, Seguin ISD, Navarro ISD, Marion ISD |
| Hale County | 5 | 5,789 | Plainview ISD, Abernathy ISD, Hale Center ISD, Petersburg ISD, Cotton Center ISD |
| Hall County | 1 | 345 | Memphis ISD |
| Hamilton County | 3 | 1,787 | Hamilton ISD, Hico ISD, Jonesboro ISD |
| Hansford County | 3 | 1,229 | Spearman ISD, Gruver ISD, Pringle-Morse CISD |
| Hardeman County | 2 | 623 | Quanah ISD, Chillicothe ISD |
| Hardin County | 5 | 11,144 | Lumberton ISD, Hardin-Jefferson ISD, Silsbee ISD, Kountze ISD, West Hardin County CISD |
| Harris County | 19 | 721,415 | All 19 Harris County districts → |
| Harrison County | 6 | 31,964 | Hallsville ISD, Marshall ISD, Waskom ISD, Elysian Fields ISD, Harleton ISD, Karnack ISD |
| Hartley County | 2 | 357 | Hartley ISD, Channing ISD |
| Haskell County | 3 | 793 | Haskell CISD, Rule ISD, Paint Creek ISD |
| Hays County | 4 | 43,925 | Hays CISD, Dripping Springs ISD, San Marcos CISD, Wimberley ISD |
| Hemphill County | 1 | 758 | Canadian ISD |
| Henderson County | 8 | 10,190 | Athens ISD, Brownsboro ISD, Eustace ISD, Malakoff ISD, Cross Roads ISD, Lapoynor ISD, Trinidad ISD, Murchison ISD |
| Hidalgo County | 16 | 180,861 | All 16 Hidalgo County districts → |
| Hill County | 12 | 6,430 | Hillsboro ISD, Whitney ISD, Itasca ISD, Hubbard ISD, Covington ISD, Blum ISD, Aquilla ISD, Abbott ISD, Penelope ISD, Bynum ISD, Mount Calm ISD, Malone ISD |
| Hockley County | 6 | 4,584 | Levelland ISD, Ropes ISD, Sundown ISD, Smyer ISD, Whitharral ISD, Anton ISD |
| Hood County | 3 | 9,324 | Granbury ISD, Tolar ISD, Lipan ISD |
| Hopkins County | 7 | 6,713 | Sulphur Springs ISD, Como-Pickton CISD, North Hopkins ISD, Cumby Collegiate ISD, Miller Grove ISD, Saltillo ISD, Sulphur Bluff ISD |
| Houston County | 5 | 3,038 | Crockett ISD, Grapeland ISD, Latexo ISD, Lovelady ISD, Kennard ISD |
| Howard County | 3 | 5,155 | Big Spring ISD, Coahoma ISD, Forsan ISD |
| Hudspeth County | 3 | 566 | Ft Hancock ISD, Sierra Blanca ISD, Dell City ISD |
| Hunt County | 10 | 17,062 | Greenville ISD, Caddo Mills ISD, Quinlan ISD, Commerce ISD, Lone Oak ISD, Bland ISD, Wolfe City ISD, Boles ISD, Celeste ISD, Campbell ISD |
| Hutchinson County | 3 | 3,635 | Borger ISD, Sanford-Fritch ISD, Plemons-Stinnett-Phillips CISD |
| Irion County | 1 | 334 | Irion County ISD |
| Jack County | 3 | 1,613 | Jacksboro ISD, Perrin-Whitt CISD, Bryson ISD |
| Jackson County | 3 | 3,399 | Edna ISD, Industrial ISD, Ganado ISD |
| Jasper County | 4 | 5,411 | Jasper ISD, Buna ISD, Kirbyville CISD, Evadale ISD |
| Jeff Davis County | 2 | 714 | Ft Davis ISD, Valentine ISD |
| Jefferson County | 6 | 37,421 | Beaumont ISD, Port Arthur ISD, Port Neches-Groves ISD, Nederland ISD, Hamshire-Fannett ISD, Sabine Pass ISD |
| Jim Hogg County | 1 | 967 | Jim Hogg County ISD |
| Jim Wells County | 5 | 7,302 | Alice ISD, Orange Grove ISD, Premont ISD, Ben Bolt-Palito Blanco ISD, La Gloria ISD |
| Johnson County | 9 | 38,452 | Burleson ISD, Cleburne ISD, Joshua ISD, Alvarado ISD, Godley ISD, Venus ISD, Grandview ISD, Keene ISD, Rio Vista ISD |
| Jones County | 5 | 2,572 | Hawley ISD, Anson ISD, Stamford ISD, Hamlin Collegiate ISD, Lueders-Avoca ISD |
| Karnes County | 4 | 2,383 | Karnes City ISD, Kenedy ISD, Falls City ISD, Runge ISD |
| Kaufman County | 7 | 42,263 | Forney ISD, Crandall ISD, Terrell ISD, Kaufman ISD, Mabank ISD, Kemp ISD, Scurry-Rosser ISD |
| Kendall County | 2 | 12,173 | Boerne ISD, Comfort ISD |
| Kenedy County | 1 | 126 | Kenedy County Wide CSD |
| Kent County | 1 | 169 | Jayton-Girard ISD |
| Kerr County | 5 | 6,716 | Kerrville ISD, Ingram ISD, Center Point ISD, Hunt ISD, Divide ISD |
| Kimble County | 1 | 589 | Junction ISD |
| King County | 1 | 93 | Guthrie CSD |
| Kinney County | 1 | 521 | Brackett ISD |
| Kleberg County | 4 | 4,444 | Kingsville ISD, Santa Gertrudis ISD, Ricardo ISD, Riviera ISD |
| Knox County | 3 | 710 | Munday CISD, Knox City-O'Brien CISD, Benjamin ISD |
| La Salle County | 1 | 1,157 | Cotulla ISD |
| Lamar County | 4 | 8,516 | Paris ISD, North Lamar ISD, Chisum ISD, Prairiland ISD |
| Lamb County | 5 | 2,630 | Littlefield ISD, Olton ISD, Sudan ISD, Springlake-Earth ISD, Amherst ISD |
| Lampasas County | 2 | 3,956 | Lampasas ISD, Lometa ISD |
| Lavaca County | 7 | 4,005 | Yoakum ISD, Hallettsville ISD, Shiner ISD, Moulton ISD, Sweet Home ISD, Ezzell ISD, Vysehrad ISD |
| Lee County | 3 | 3,108 | Giddings ISD, Lexington ISD, Dime Box ISD |
| Leon County | 5 | 3,286 | Buffalo ISD, Leon ISD, Centerville ISD, Normangee ISD, Oakwood ISD |
| Liberty County | 7 | 24,410 | Cleveland ISD, Dayton ISD, Liberty ISD, Tarkington ISD, Hardin ISD, Hull-Daisetta ISD, Devers ISD |
| Limestone County | 3 | 3,628 | Mexia ISD, Groesbeck ISD, Coolidge ISD |
| Lipscomb County | 3 | 611 | Booker ISD, Follett ISD, Darrouzett ISD |
| Live Oak County | 2 | 1,629 | George West ISD, Three Rivers ISD |
| Llano County | 1 | 1,968 | Llano ISD |
| Lubbock County | 9 | 50,528 | Lubbock ISD, Frenship ISD, Lubbock-Cooper ISD, Shallowater ISD, Slaton ISD, Roosevelt ISD, Idalou ISD, New Deal ISD, Texas Tech University K-12 |
| Lynn County | 4 | 1,706 | New Home ISD, Tahoka ISD, O'Donnell ISD, Wilson ISD |
| Madison County | 2 | 2,710 | Madisonville CISD, North Zulch ISD |
| Marion County | 1 | 1,125 | Jefferson ISD |
| Martin County | 2 | 1,303 | Stanton ISD, Grady ISD |
| Mason County | 1 | 700 | Mason ISD |
| Matagorda County | 5 | 6,951 | Bay City ISD, Palacios ISD, Tidehaven ISD, Van Vleck ISD, Matagorda ISD |
| Maverick County | 1 | 13,820 | Eagle Pass ISD |
| McCulloch County | 3 | 1,218 | Brady ISD, Rochelle ISD, Lohn ISD |
| McLennan County | 19 | 43,399 | All 19 McLennan County districts → |
| McMullen County | 1 | 280 | McMullen County ISD |
| Medina County | 5 | 14,942 | Medina Valley ISD, Devine ISD, Hondo ISD, Natalia ISD, D'hanis ISD |
| Menard County | 1 | 264 | Menard ISD |
| Midland County | 2 | 33,024 | Midland ISD, Greenwood ISD |
| Milam County | 6 | 4,276 | Cameron ISD, Rockdale ISD, Thorndale ISD, Milano ISD, Gause ISD, Buckholts ISD |
| Mills County | 3 | 767 | Goldthwaite ISD, Mullin ISD, Priddy ISD |
| Mitchell County | 3 | 1,288 | Colorado ISD, Westbrook ISD, Loraine ISD |
| Montague County | 7 | 3,240 | Bowie ISD, Nocona ISD, Saint Jo ISD, Forestburg ISD, Montague ISD, Gold Burg ISD, Prairie Valley ISD |
| Montgomery County | 6 | 132,139 | Conroe ISD, New Caney ISD, Magnolia ISD, Montgomery ISD, Willis ISD, Splendora ISD |
| Moore County | 2 | 4,974 | Dumas ISD, Sunray Collegiate ISD |
| Morris County | 2 | 1,879 | Daingerfield-Lone Star ISD, Pewitt CISD |
| Motley County | 1 | 179 | Motley County ISD |
| Nacogdoches County | 8 | 10,143 | Nacogdoches ISD, Central Heights ISD, Woden ISD, Garrison ISD, Cushing ISD, Douglass ISD, Chireno ISD, Martinsville ISD |
| Navarro County | 6 | 4,625 | Rice ISD, Blooming Grove ISD, Mildred ISD, Kerens ISD, Dawson ISD, Frost ISD |
| Newton County | 3 | 1,750 | Newton ISD, Deweyville ISD, Burkeville ISD |
| Nolan County | 3 | 14,248 | Roscoe Collegiate ISD, Sweetwater ISD, Blackwell CISD |
| Nueces County | 12 | 55,845 | All 12 Nueces County districts → |
| Ochiltree County | 1 | 1,802 | Perryton ISD |
| Oldham County | 4 | 844 | Vega ISD, Wildorado ISD, Boys Ranch ISD, Adrian ISD |
| Orange County | 5 | 15,015 | Vidor ISD, Little Cypress-Mauriceville CISD, Bridge City ISD, West Orange-Cove CISD, Orangefield ISD |
| Palo Pinto County | 6 | 4,717 | Mineral Wells ISD, Santo ISD, Graford ISD, Gordon ISD, Strawn ISD, Palo Pinto ISD |
| Panola County | 3 | 3,797 | Carthage ISD, Beckville ISD, Gary ISD |
| Parker County | 8 | 26,823 | Aledo ISD, Weatherford ISD, Springtown ISD, Brock ISD, Peaster ISD, Millsap ISD, Poolville ISD, Garner ISD |
| Parmer County | 4 | 2,164 | Friona ISD, Farwell ISD, Bovina ISD, Lazbuddie ISD |
| Pecos County | 3 | 14,033 | Fort Stockton ISD, Iraan-Sheffield Collegiate ISD, Buena Vista ISD |
| Polk County | 6 | 7,045 | Livingston ISD, Onalaska ISD, Corrigan-Camden ISD, Big Sandy ISD, Goodrich ISD, Leggett ISD |
| Potter County | 4 | 32,725 | Amarillo ISD, Bushland ISD, River Road ISD, Highland Park ISD |
| Presidio County | 2 | 1,279 | Presidio ISD, Marfa ISD |
| Rains County | 1 | 1,712 | Rains ISD |
| Randall County | 1 | 11,565 | Canyon ISD |
| Reagan County | 1 | 855 | Reagan County ISD |
| Real County | 1 | 343 | Leakey ISD |
| Red River County | 4 | 1,976 | Rivercrest ISD, Clarksville ISD, Detroit ISD, Avery ISD |
| Reeves County | 2 | 3,065 | Pecos-Barstow-Toyah ISD, Balmorhea ISD |
| Refugio County | 3 | 1,197 | Refugio ISD, Woodsboro ISD, Austwell-Tivoli ISD |
| Roberts County | 1 | 177 | Miami ISD |
| Robertson County | 5 | 3,408 | Franklin ISD, Hearne ISD, Mumford ISD, Bremond ISD, Calvert ISD |
| Rockwall County | 2 | 29,269 | Rockwall ISD, Royse City ISD |
| Runnels County | 4 | 1,960 | Ballinger ISD, Winters ISD, Miles ISD, Olfen ISD |
| Rusk County | 8 | 7,717 | Henderson ISD, Tatum ISD, West Rusk County Consolidated ISD, Carlisle ISD, Overton ISD, Mount Enterprise ISD, Leveretts Chapel ISD, Laneville ISD |
| Sabine County | 3 | 1,807 | Hemphill ISD, West Sabine ISD, Brookeland ISD |
| San Augustine County | 2 | 974 | San Augustine ISD, Broaddus ISD |
| San Jacinto County | 2 | 3,553 | Shepherd ISD, Coldspring-Oakhurst CISD |
| San Patricio County | 7 | 13,848 | Gregory-Portland ISD, Ingleside ISD, Sinton ISD, Aransas Pass ISD, Mathis ISD, Odem-Edroy ISD, Taft ISD |
| San Saba County | 3 | 981 | San Saba ISD, Cherokee ISD, Richland Springs ISD |
| Schleicher County | 1 | 415 | Schleicher ISD |
| Scurry County | 3 | 2,859 | Snyder ISD, Ira ISD, Hermleigh ISD |
| Shackelford County | 2 | 589 | Albany ISD, Moran ISD |
| Shelby County | 6 | 5,174 | Center ISD, Shelbyville ISD, Timpson ISD, Joaquin ISD, Tenaha ISD, Excelsior ISD |
| Sherman County | 2 | 669 | Stratford ISD, Texhoma ISD |
| Smith County | 7 | 34,299 | Tyler ISD, Whitehouse ISD, Lindale ISD, Chapel Hill ISD, Winona ISD, Troup ISD, Arp ISD |
| Somervell County | 1 | 2,119 | Glen Rose ISD |
| Starr County | 3 | 15,488 | Rio Grande City Grulla ISD, Roma ISD, San Isidro ISD |
| Stephens County | 1 | 1,374 | Breckenridge ISD |
| Sterling County | 1 | 355 | Sterling City ISD |
| Stonewall County | 1 | 181 | Aspermont ISD |
| Sutton County | 1 | 643 | Sonora ISD |
| Swisher County | 3 | 1,316 | Tulia ISD, Kress ISD, Happy ISD |
| Tarrant County | 16 | 328,315 | All 16 Tarrant County districts → |
| Taylor County | 5 | 23,015 | Abilene ISD, Wylie ISD, Jim Ned CISD, Merkel ISD, Trent ISD |
| Terrell County | 1 | 114 | Terrell County ISD |
| Terry County | 3 | 2,086 | Brownfield ISD, Wellman-Union CISD, Meadow ISD |
| Throckmorton County | 2 | 322 | Woodson ISD, Throckmorton Collegiate ISD |
| Titus County | 3 | 6,972 | Mount Pleasant ISD, Chapel Hill ISD, Harts Bluff ISD |
| Tom Green County | 6 | 16,703 | San Angelo ISD, Wall ISD, Grape Creek ISD, Christoval ISD, Water Valley ISD, Veribest ISD |
| Travis County | 8 | 140,980 | Austin ISD, Pflugerville ISD, Del Valle ISD, Lake Travis ISD, Manor ISD, Eanes ISD, Lago Vista ISD, University of Texas at Austin H S |
| Trinity County | 4 | 2,257 | Trinity ISD, Groveton ISD, Apple Springs ISD, Centerville ISD |
| Tyler County | 5 | 3,382 | Woodville ISD, Warren ISD, Colmesneil ISD, Spurger ISD, Chester ISD |
| Upshur County | 7 | 7,416 | Gilmer ISD, New Diana ISD, Harmony ISD, Ore City ISD, Union Grove ISD, Big Sandy ISD, Union Hill ISD |
| Upton County | 2 | 785 | McCamey ISD, Rankin ISD |
| Uvalde County | 4 | 5,085 | Uvalde CISD, Sabinal ISD, Knippa ISD, Utopia ISD |
| Val Verde County | 2 | 9,943 | San Felipe-Del Rio CISD, Comstock ISD |
| Van Zandt County | 7 | 10,674 | Wills Point ISD, Van ISD, Canton ISD, Grand Saline ISD, Edgewood ISD, Martins Mill ISD, Fruitvale ISD |
| Victoria County | 3 | 13,870 | Victoria ISD, Bloomington ISD, Nursery ISD |
| Walker County | 3 | 12,034 | Huntsville ISD, New Waverly ISD, Windham School District |
| Waller County | 3 | 14,374 | Waller ISD, Royal ISD, Hempstead ISD |
| Ward County | 2 | 2,338 | Monahans-Wickett-Pyote ISD, Grandfalls-Royalty ISD |
| Washington County | 2 | 5,495 | Brenham ISD, Burton ISD |
| Webb County | 3 | 61,253 | United ISD, Laredo ISD, Webb CISD |
| Wharton County | 5 | 7,729 | El Campo ISD, Wharton ISD, Boling ISD, East Bernard ISD, Louise ISD |
| Wheeler County | 4 | 985 | Wheeler ISD, Shamrock ISD, Fort Elliott CISD, Kelton ISD |
| Wichita County | 5 | 19,355 | Wichita Falls ISD, Burkburnett ISD, Iowa Park CISD, City View ISD, Electra ISD |
| Wilbarger County | 3 | 2,110 | Vernon ISD, Northside ISD, Harrold ISD |
| Willacy County | 4 | 3,889 | Raymondville ISD, Lyford CISD, Lasara ISD, San Perlita ISD |
| Williamson County | 11 | 133,972 | All 11 Williamson County districts → |
| Wilson County | 4 | 9,448 | Floresville ISD, La Vernia ISD, Poth ISD, Stockdale ISD |
| Winkler County | 2 | 1,777 | Kermit ISD, Wink-Loving ISD |
| Wise County | 7 | 10,549 | Decatur ISD, Bridgeport ISD, Boyd ISD, Paradise ISD, Alvord ISD, Chico ISD, Slidell ISD |
| Wood County | 6 | 6,349 | Mineola ISD, Winnsboro ISD, Quitman ISD, Alba-Golden ISD, Hawkins ISD, Yantis ISD |
| Yoakum County | 2 | 1,897 | Denver City ISD, Plains ISD |
| Young County | 3 | 3,066 | Graham ISD, Olney ISD, Newcastle ISD |
| Zapata County | 1 | 3,290 | Zapata County ISD |
| Zavala County | 2 | 2,082 | Crystal City ISD, La Pryor ISD |
