ABERCARN, urban district, Monmouthshire, England. Pop. (1931) 20,554. It is situated in the middle portion of the Ebbw valley and like the other towns of the north and east of the coalfield had an early association with iron smelting, and then relied more and more on the export of coal, but tin plates are manufactured in large quantities. Like the other towns of the coalfield, it is mainly a long street along the valley. It has shared the deep industrial depression in the neighbourhood since 1918. Abercarn has a station on the Great Western railway branch line from Newport and is in the Abertillery parliamentary division.