Oak Hill is a town in Wilcox County, Alabama, United States. According to the 1940 U.S. Census, it incorporated in 1938. Per the 2020 census, the population was 14. It is the smallest incorporated town in Alabama as of 2020, succeeding McMullen. The smallest unincorporated census-designated place in the state is also located in Wilcox County, that of Catherine, which had 22 residents as of 2010. With a median household income of $9,286, Oak Hill is the poorest community in Alabama.