FAIRFIELD, a city of Jefferson county, Alabama, U.S.A., 5m. W. of Birmingham; served by the Birmingham Southern and the Southern railways. The population was 5,003 in 1920 (46% negroes) and was 11,059 in 1930 by the Federal census. It is an industrial suburb, with large steel plants, coke, freight-car, wire, brick and chemical works. The city was founded in 1910 to provide for the employes of the new plants of the United States Steel Corporation (which in 1907 had purchased the Ten nessee Coal, Iron and Railroad company), and was laid out with a regard to beauty. It is the seat of the Employes' hospital of the Tennessee Coal, Iron and Railroad company. The city was incor porated in 1918.