A list of Counties in the U.S. State of Texas :
- Bailey County formed in 1876 from Bexar County.
- Bandera County formed in 1856 from Bexar County.
- Bastrop County formed in 1836. One of the original counties, was called Mina until 1837. Was a "municipio" under Mexican rule.
- Baylor County formed in 1858 from part of Fannin County.
- Bee County formed in 1857 from parts of San Patricio County, Goliad County, Refugio County, Live Oak County, and Karnes County.
- Bell County formed in 1850 from part of Milam County.
- Bexar County formed in 1836. One of the original counties. San Antonio de Béxar was a "municipio" and capital of the "departamento" of Béxar under Mexican rule.
- Blanco County formed in 1858 from parts of Burnet County, Comal County, Gillespie County and Hays County.
- Borden County formed in 1876 from part of Bexar County.
- Bosque County formed in 1854 from part of McLennan County.
- Bowie County formed in 1840 from part of Red River County.
- Brazoria County formed in 1836. One of the original counties, was a "municipio" under Mexican rule.
- Brazos County formed in 1841 from parts of Washington County. Was named Navasota County until 1842.
- Brewster County formed in 1887 from Presidio County.
- Briscoe County formed in 1876 from part of Bexar County.
- Brooks County formed in 1911 from part of Starr County.
- Brown County formed in 1856 from parts of Comanche County and Travis County.
- Burleson County formed in 1846 from Milam County.
- Burnet County formed in 1852 from parts of Bell County, Travis County and Williamson County.
- Dallam County formed in 1876 from part of Bexar County.
- Dallas County formed in 1846 from parts of Nacogdoches County and Robertson County.
- Dawson County formed in 1876 from part of Bexar County.
- Deaf Smith County formed in 1876 from part of Bexar County.
- Delta County formed in 1870 from parts of Hopkins County and Lamar County.
- Denton County formed in 1846 from part of Fannin County.
- DeWitt County formed in 1846 from parts of Goliad County, Gonzales County, and Victoria County.
- Dickens County formed in 1876 from part of Bexar County.
- Dimmit County formed in 1858 from parts of Bexar County, Maverick County, Uvalde County and Webb County
- Donley County formed in 1876 from part of Bexar County.
- Duval County formed in 1858 from parts of Live Oak County, Nueces County and Starr County.
- Eastland County formed in 1858 from parts of Bosque County, Coryell County, and Travis County.
- Ector County formed in 1887 from part of Tom Green County.
- Edwards County formed in 1858 from parts of Bexar County.
- El Paso County formed in 1848 from part of Santa Fe County.
- Ellis County formed in 1849 from part of Navarro County.
- Erath County formed in 1856 from parts of Bosque County and Coryell County.
- Falls County formed in 1850 from Limestone County and Milam County.
- Fannin County formed in 1837 from part of Red River County.
- Fayette County formed in 1837 from part of Bastrop County.
- Fisher County formed in 1876 from part of Bexar County.
- Floyd County formed in 1876 from part of Bexar County and Young County.
- Foard County formed in 1891 from parts of Cottle County, Hardeman County, King County and Knox County.
- Fort Bend County formed in 1837 from parts of Austin County, Brazoria County, and Harris County.
- Franklin County formed in 1875 from part of Titus County.
- Freestone County formed in 1850 from parts of Limestone County.
- Frio County formed in 1858 from parts of Atascosa County, Bexar County, and Uvalde County.
- Hale County formed in 1876 from part of Bexar County.
- Hall County formed in 1876 from parts of Bexar County and Young County.
- Hamilton County formed in 1856 from parts of Bosque County, Comanche County, and Lampasas County.
- Hansford County formed in 1876 from parts of Bexar County and Young County.
- Hardeman County formed in 1858 from part Fannin County.
- Hardin County formed in 1858 from parts of Jefferson County and Liberty County.
- Harris County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule with the name Harrisburg. Changed to Harris County in 1839.
- Harrison County formed in 1839 from part of Shelby County.
- Hartley County formed in 1876 from parts of Bexar County and Young County.
- Haskell County formed in 1858 from parts of Fannin County and Milam County.
- Hays County formed in 1848 from part of Travis County.
- Hemphill County formed in 1876 from parts of Bexar County and Young County.
- Henderson County formed in 1846 from parts of Houston and Nacogdoches County.
- Hidalgo County formed in 1852 from part of Cameron County.
- Hill County formed in 1853 from part of Navarro County.
- Hockley County formed in 1876 from parts of Bexar County and Young County.
- Hood County formed in 1866 from part of Johnson County.
- Hopkins County formed in 1846 from parts of Lamar County and Nacogdoches County.
- Houston County formed in 1837 from part of Nacogdoches County.
- Howard County formed im 1876 from part of Bexar County.
- Hudspeth County formed in 1917 from part of El Paso County.
- Hunt County formed in 1846 from parts of Fannin County and Nacogdoches County.
- Hutchinson County formed in 1876 from part of Bexar County.
- Jack County formed in 1856 from Cooke County.
- Jackson County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule.
- Jasper County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule named Bevil.
- Jeff Davis County formed in 1887 from Presidio County.
- Jefferson County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule.
- Jim Hogg County formed in 1913 from parts of Brooks County and Duval County.
- Jim Wells County formed in 1911 from part of Nueces County.
- Johnson County formed in 1854 from parts of Ellis County, Hill County and Navarro County.
- Jones County formed in 1858 from parts of Bexar County and Bosque County.
- Karnes County formed in 1854 from parts of Bexar County, DeWitt County, Goliad County, Gonzales County and San Patricio County.
- Kaufman County formed in 1848 from part of Henderson County.
- Kendall County formed in 1862 from parts of Blanco County and Kerr County.
- Kenedy County formed in 1921 from parts of Hidalgo County and Willacy County.
- Kent County formed in 1876 from parts of Bexar County and Young County.
- Kerr County formed in 1856 from part of Bexar County.
- Kimble County formed in 1858 from part of Bexar County.
- King County formed in 1876 from part of Bexar County.
- Kinney County formed in 1850 from part of Bexar County.
- Kleberg County formed in 1913 from part of Nueces County.
- Knox County formed in 1858 from parts of Bexar County and Young County.
- La Salle County formed in 1858 from parts of Bexar County.
- Lamar County formed in 1840 from part of Red River County.
- Lamb County formed in 1876 from parts of Bexar County.
- Lampasas County formed in 1856 from parts of Bell County, Coryell County and Travis County.
- Lavaca County formed in 1842 from parts of Colorado County, Fayette County, Gonzales County, Jackson County and Victoria County. Was named La Baca until 1846.
- Lee County formed in 1874 from parts of Bastrop County, Burleson County, Fayette County and Washington County.
- Leon County formed in 1846 from part of Robertson County.
- Liberty County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule named Libertad.
- Limestone County formed in 1846 from part of Robertson County.
- Lipscomb County formed in 1876 from part of Bexar County.
- Live Oak County formed in 1856 from parts of Nueces County and San Patricio County.
- Llano County formed in 1856 from parts of Bexar County and Gillespie County.
- Loving County formed in 1887 from part of Tom Green County.
- Lubbock County formed in 1876 from part of Bexar County.
- Lynn County formed in 1876 from part of Garza County.
- Madison County formed in 1853 from parts of Grimes County, Leon County and Walker County.
- Marion County formed in 1860 from part of Cass County.
- Martin County formed in 1876 from part of Bexar County.
- Mason County formed in 1858 from part of Gillespie County.
- Matagorda County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule.
- Maverick County formed in 1856 from Kinney County.
- McCulloch County formed in 1856 from part of Bexar County.
- McLennan County formed in 1850 from parts of Limestone County and Milam County.
- McMullen County formed in 1858 from parts of Atascosa County, Bexar County and Live Oak County.
- Medina County formed in 1848 from part of Bexar County.
- Menard County formed in 1858 from part of Bexar County.
- Midland County formed in 1885 from part of Tom Green County.
- Milam County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule named Viesca until 1835.
- Mills County formed in 1887 from parts of Brown County, Comanche County, Hamilton County, and Lampasas County.
- Mitchell County formed in 1876 from part of Bexar County.
- Montague County formed in 1857 from part of Cooke County.
- Montgomery County formed in 1837 from part of Washington County.
- Moore County formed in 1876 from part of Bexar County.
- Morris County formed in 1875 from part of Titus County.
- Motley County formed in 1876 from part of Bexar County.
- Nacogdoches County formed in 1836. One of the original counties. Was a "municipio" and capital of a "departamento" under Mexican rule.
- Navarro County formed in 1846 from a part of Robertson County.
- Newton County formed in 1846 from part of Jasper County.
- Nolan County formed in 1876 from part of Bexar County.
- Nueces County formed in 1846 from part of San Patricio County.
- Palo Pinto County formed in 1856 from parts of Bosque County and Navarro County.
- Panola County formed in 1846 from parts of Harrison County and Shelby County.
- Parker County formed in 1855 from parts of Bosque County and Navarro County.
- Parmer County formed in 1876 from part of Bexar County.
- Pecos County formed in 1871 from part of Presidio County.
- Polk County formed in 1836 from part of the "municipio" of Liberty. One of the original counties.
- Potter County formed in 1876 from part of Bexar County.
- Presidio County formed in 1850 from part of Bexar County.
- Rains County formed in 1870 from parts of Hopkins County, Hunt County and Wood County.
- Randall County formed in 1876 from part of Bexar County.
- Reagan County formed in 1903 from part of Tom Green County.
- Real County formed in 1913 from parts of Bandera County, Edwards County and Kerr County.
- Red River County formed in 1837 from part of the old Red River District.
- Reeves County formed in 1883 from part of Pecos County.
- Refugio County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule.
- Roberts County formed in 1876 from part of Bexar County.
- Robertson County formed in 1837 from parts of Bexar County, Milam County and Nacogdoches County.
- Rockwall County formed in 1873 from part of Kaufman County.
- Runnels County formed in 1858 from parts of Bexar County and Travis County.
- Rusk County formed in 1843 from part of Nacogdoches County.
- Val Verde County formed in 1885 from parts of Crockett County, Kinney County and Pecos County.
- Van Zandt County formed in 1848 from part of Henderson County.
- Victoria County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule.
- Walker County formed in 1846 from part of Montgomery County.
- Waller County formed in 1873 from parts of Austin County and Grimes County.
- Ward County formed in 1887 from part of Tom Green County.
- Washington County formed in 1836. Was a "municipio" under Mexican rule.
- Webb County formed in 1848 from part of Nueces County.
- Wharton County formed in 1846 from parts of Colorado County, Jackson County and Matagorda County.
- Wheeler County formed in 1876 from parts of Bexar County and Young County.
- Wichita County formed in 1858 from part of Cooke County.
- Wilbarger County formed in 1858 from part of Bexar County.
- Willacy County formed in 1911 from parts of Cameron County and Hidalgo County.
- Williamson County formed in 1848 from part of Milam County.
- Wilson County formed in 1874 from parts of Bexar County, Guadalupe County and Karnes County.
- Winkler County formed in 1887 from part of Tom Green County.
- Wise County formed in 1856 from part of Cooke County.
- Wood County formed in 1850 from part of Van Zandt County.
- Yoakum County formed in 1876 from part of Bexar County.
- Young County formed in 1856 from parts of Bosque County and Fannin County.
- Zapata County formed in 1858 from parts of Starr County and Webb County.
- Zavala County formed in 1858 from part of Maverick County.
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