Borden County is a rural county located in the U.S. state of Texas. It is in West Texas and its county seat is Gail. As of the 2020 census, its population was 631, making it the fifth-least populous county in Texas. Borden is one of four remaining prohibition or entirely dry counties in the state of Texas. The county was created in 1876 and later organized in 1891. Gail and Borden County are named for Gail Borden Jr., businessman, publisher, surveyor, and pioneer of condensed milk.