Texas's 21st congressional district

Texas's 21st congressional district of the United States House of Representatives serves the area north of San Antonio and a significant portion of Austin in the state of Texas. Towns entirely or partially in this district include Boerne, Fredericksburg, Ingram, Kerrville, Kyle, New Braunfels, and San Marcos. The current Representative from the 21st district is Chip Roy.

The district was created in 1934, and has always been anchored in the Texas Hill Country and northern San Antonio. However, until the early 1980s, it stretched for some distance into West Texas, as far as Big Bend National Park. It began shifting away from its Yellow Dog Democrat roots in the late 1960s, though it took until 1978 for a Republican to win it. The GOP has held it ever since, in large part due to the increased growth of the San Antonio suburbs. The district was pushed into the Austin area in the 1980 census; until the 2000s it included fast-growing Round Rock.