Ad Hall is a ghost town in Milam County, Texas, United States. Situated on the junction of U.S. Route 190 and Farm to Market Road 486, a post office operated from 1874 to 1912. It became a electoral precinct in 1880. In 1881, the Gulf, Colorado and Santa Fe Railway built rail through the town. At its peak in the 1880s, it had a population of 200, which fell to 35 in the 1890s. It continued decline, being abandoned by 2000.