 The population of Castlebellingham-Kilsaran (named for the two townlands which make up the census area) increased from 721 inhabitants as of the 2002 census, to 1,126 people as of the 2016 census.The castle of Castlebellingham has served as one of the ancestral homes for Bellinghams since the 17th century.The Bellingham family originated in the small town of Kendal, Westmorland in England, the original ancestor of the Irish Bellinghams, Alan Bellingham hailed from here.