30°18′28″N 96°30′38″W / 30.307711°N 96.510524°W Quarry is an unincorporated community in northern Washington County, Texas, United States. It lies along State Highway 36, northwest of the city of Brenham, the county seat of Washington County.[1] Its elevation is 256 feet (78 m), and it is located at 30°18′28″N 96°30′38″W / 30.30778°N 96.51056°W (30.3077111, -96.5105241).[2] Named for local quarries, the community was built along the Gulf, Colorado and Santa Fe Railway. In 1891, a post office was opened in Quarry. As the years passed, Quarry declined, in part due to the decreasing importance of its mining economy; its post office closed in 1905. Ranching has been the mainstay of the community in recent years.[3]