Throckmorton County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 1,641. Its county seat is Throckmorton. The county was created in 1858 and later organized in 1879. It is named for William Throckmorton, an early Collin County settler. Throckmorton County is one of 22 prohibition, or entirely dry, counties in the state of Texas.