Index:

A

• Anderson County formed in 1846 from part of Houston County.
• Andrews County formed in 1876 from Bexar County.
• Angelina County formed in 1846 from part of Nacogdoches County.
• Aransas County formed in 1871 from part of Refugio County.
• Archer County formed in 1858 from part of Clay County.
• Armstrong County formed in 1876 from Bexar County.
• Atascosa County formed in 1856 from Bexar County.
• Austin County formed in 1836. One of the original counties, was a "municipio" called San Felipe de Austin and capital of the "departamento" of Brazos under Mexican rule.

B

• 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.

C

• Caldwell County formed in 1848 from parts of Bastrop County and Gonzalez County.
• Calhoun County formed in 1846 from parts of Jackson County, Matagorda County and Victoria County.
• Callahan County formed in 1858 from parts of Bexar County, Bosque County, and Travis County.
• Cameron County formed in 1848 from part of Nueces County and lands ceded by Mexico.
• Camp County formed in 1874 from part of Upshur County.
• Carson County formed in 1876 from part of Bexar County.
• Cass County formed in 1846 from part of Bowie County. Was named Davis County between 1861 and 1871.
• Castro County formed in 1876 form part of Bexar County.
• Chambers County formed in 1858 from parts of Jefferson County and Liberty County.
• Cherokee County formed in 1846 from part of Nacogdoches County.
• Childress County formed in 1876 from part of Bexar County and Young County.
• Clay County formed in 1857 from part of Cooke County.
• Cochran County formed in 1876 from parts of Bexar County and Young County.
• Coke County formed in 1889 from part of Tom Green County.
• Coleman County formed in 1858 from parts of Brown County and Travis County.
• Collin County formed in 1846 from part of Fannin County.
• Collingsworth County formed in 1876 from parts of Bexar County and Young County.
• Colorado County formed in 1836. One of the original counties.
• Comal County formed in 1846 from part of Bexar County.
• Comanche County formed in 1856 from parts of Bosque County and Coryell County.
• Concho County formed in 1858 from Bexar County.
• Cooke County formed in 1848 from part of Fannin County.
• Coryell County formed in 1854 from part of Bell County.
• Cottle County formed in 1876 from part of Fannin County.
• Crane County formed in 1887 from part of Tom Green County.
• Crockett County formed in 1875 from part of Bexar County.
• Crosby County formed in 1876 from parts of Bexar County and Young County.
• Culberson County formed in 1911 from part of El Paso County.

D

• 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.

E

• 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.

F

• 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.

G

• Gaines County formed in 1876 from part of Bexar County.
• Galveston County formed in 1838 from parts of Brazoria County, Harris County and Liberty County.
• Garza County formed in 1876 from part of Bexar County.
• Gillespie County formed in 1848 from parts of Bexar County and Travis County.
• Glasscock County formed in 1887 from part of Tom Green County.
• Goliad County formed in 1836. One of the original counties. Was a "municipio" under Mexican rule.
• Gonzales County formed in 1836. One of the original counties.
• Gray County formed in 1876 from part of Bexar County.
• Grayson County formed in 1846 from part of Fannin County.
• Gregg County formed in 1873 from part of Upshur County.
• Grimes County formed in 1846 from part of Montgomery County.
• Guadalupe County formed in 1846 from parts of Bexar County and Gonzalez County.

H

• 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.

I

• Irion County formed in 1889 from part of Tom Green County.

J

• 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.

K

• 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.

L

• 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.

M

• 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.

N

• 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.

O

• Ochiltree County formed in 1876 from part of Bexar County.
• Oldham County formed in 1876 from part of Bexar County.
• Orange County formed in 1852 from part of Jefferson County.

P

• 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.

R

• 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.

S

• Sabine County Formed in 1837. Was a "municipio" under Mexican rule.
• San Augustine County Formed in 1837. Was a "municipio" under Mexican rule.
• San Jacinto County formed in 1870 from parts of Liberty County, Montgomery County, Polk County and Walker County.
• San Patricio County formed in 1846 from part of Refugio County.
• San Saba County formed in 1856 from part of Bexar County.
• Schleicher County formed in 1887 from part of Crockett County.
• Scurry County formed in 1876 from part of Bexar County.
• Shackelford County formed in 1874 from Jack County.
• Shelby County formed in 1836. Was a "municipio" under Mexican rule named Tenehaw.
• Sherman County formed in 1876 from part of Bexar County.
• Smith County formed in 1846 from part of Nacogdoches County.
• Somervell County formed in 1875 from part of Hood County.
• Starr County formed in 1848 from part of Nueces County.
• Stephens County formed in 1858 from part of Bosque County.
• Sterling County formed in 1891 from part of Tom Green County.
• Stonewall County formed in 1876 from parts of Bexar County and Young County.
• Sutton County formed in 1887 from part of Crockett County.
• Swisher County formed in 1876 from parts of Bexar County and Young County.

T

• Tarrant County formed in 1849 from part of Navarro County.
• Taylor County formed in 1858 from parts of Bexar County and Travis County.
• Terrell County formed in 1905 from part of Pecos County.
• Terry County formed in 1876 from part of Bexar County.
• Throckmorton County formed in 1858 from part of Fannin County.
• Titus County formed in 1846 from part of Bowie County.
• Tom Green County formed in 1874 from part of Bexar County.
• Travis County formed in 1840 from part of Bastrop County.
• Trinity County formed in 1850 from part of Houston County.
• Tyler County formed in 1846 from part of Liberty County.

U

• Upshur County formed in 1846 from part of Harrison County.
• Upton County formed in 1887 from part of Tom Green County.
• Uvalde County formed in 1850 from part of Bexar County.

V

• 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.

W

• 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 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.

Y

• Yoakum County formed in 1876 from part of Bexar County.
• Young County formed in 1856 from parts of Bosque County and Fannin County.

Z

• Zapata County formed in 1858 from parts of Starr County and Webb County.
• Zavala County formed in 1858 from part of Maverick County.

Defunct counties

• Buchel County formed in 1887 from Presidio County. Annexed in 1897 to Brewster County.
• Dawson County (defunct) formed in 1858 in what is now Kinney County and Uvalde County and Abolished in 1866. Not to be confounded with Dawson County
• Encinal County Formed in 1856. Abolished in 1899 and annexed to Webb County.
• Foley County formed in 1887 from Presidio County. Annexed in 1897 to Brewster County.
• Santa Fe County formed in 1848 from lands ceded by Mexico. It included the area of New Mexico east of the Rio Grande. Abolished under the Compromise of 1850.
• Wegefarth County formed in 1873 in the Texas Panhandle and abolished in 1876.
• Worth County formed in 1850 from part of Santa Fe County. Abolished under the Compromise of 1850.

Source

• The Handbook of Texas Online
• Texas' counties formation maps