Vejen is a municipality (Danish, kommune) in Region Syddanmark on the Jutland peninsula in south Denmark. The municipality covers an area of 817 km², and has a total population of 41,350 (2005). Its mayor is Egon Fræhr, a member of the Venstre (Liberal Party) political party. The main town and the site of its municipal council is the town of Vejen. On January 1, 2007 Vejen municipality was, as the result of Kommunalreformen ("The Municipality Reform" of 2007), merged with Brørup, Holsted, and Rødding municipalities to form an enlarged Vejen municipality.