Driftwood is a census-designated place and unincorporated community in northern Hays County, Texas, United States. As of the 2010 census it had a population of 144.It lies along Farm to Market Road 150, 15 miles northwest of Kyle and 24 miles southwest of downtown Austin. San Marcos, the Hays county seat, is 25 miles south of Driftwood by highway. The community has a post office with the ZIP code of 78619.Although the earliest settlers arrived in the area now known as Driftwood around 1850, the community was really established in the 1880s. A post office was among the results of the community's significant growth in that decade. Driftwood shrank almost to a ghost town by the early twentieth century; although it grew somewhat by the middle of the century, it returned to its almost-deserted state by the 1970s.