Oak Hill is a town in Wilcox County, Alabama, United States. According to the 1940 U.S. Census, it incorporated in 1938. The population was 26 at the 2010 census, down from 37 in 2000. It is the second smallest incorporated town in Alabama as of 2010, behind McMullen. However, 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 (compared to $44,758 for the state), Oak Hill is the poorest community in Alabama.