Castro County. Formed from Young and Bexar Territories, created August 21, 1876, organized December 8, 1891. Named in honor of Henri Castro 1786-1861. A distinguished pioneer and colonizer of Texas. Founder of the towns of Castroville, Quihi, Vandenburg and D'Hans in Medina County. Dimmitt, The County Seat. 1964 #757