Cardiff is a town in Jefferson County, Alabama, United States west ofGardendale. At the 2010 census the population was 55, placing it as the least populated incorporated area in Jefferson County. It is named after thecapital of Wales. It is one of four Jefferson County cities named after cities in Great Britain, the others being Birmingham, Leeds and Brighton.
Cardiff is located at on Five Mile Creek, a tributary of the Locust Fork of the Black Warrior River. It is immediately downstream of Brookside. The region is part of theCumberland Plateau, with shallow but deeply incised stream valleys dissecting sedimentary rock, including significant seams of bituminous coal.(33.645384, -86.932965).
According to the U.S. Census Bureau, the town has a total area of 0.2 square miles (0.52 km2), all of it land.
Coal mining was the historical basis of the economy. The town, for years the smallest incorporated town in the State of Alabama, declined along with the decline of underground coal mining and the rise of strip mining. The epochal flood of May 2003 destroyed a number of buildings in that part of Cardiff close to Five Mile Creek. The town is now but a dent in the land scarce of life with a scant 20-30 people, and,covered withkudzu, Cardiff is becoming a ghost town.