Located on the southwest border of the Aargau in a hollow between Murg and Pfaffneren , consisting of the village of Balzenwil and a few individual farms. First mentioned in 1197 under Balzeuiler. Since the High Middle Ages, the Balzenwil farm was owned by the St. Urban Monastery, only 3 km away. In legal terms, Balzenwil had a special position as it was part of the St. Urban judiciary in Pfaffnau (LU), but was part of the Bernese office of Aarwangen. Since 1675 in Roggwil (BE) in church. In 1803 Balzenwil in the newly founded canton of Aargau became an independent political municipality, but in 1901 it was united with Riken to form the municipality of Murgenthal . The hamlet of Gruben, which previously belonged to Balzenwil, belonged to the municipality of Riken as early as 1803–1900. Agriculture has been a livelihood until the present day, and industry in Murgenthal and Roggwil has provided jobs since the 19th century .
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