Kopparberg is a locality situated in Sweden that serves as the seat of Ljusnarsberg Municipality within Örebro County. As of 2015, the area had a population of approximately 4,200 inhabitants.
The town is notable for several cultural and historical landmarks, including its wooden church and Kopparberg Cider, which is currently among the best-selling ciders globally and in the United Kingdom. Additionally, Kopparberg is famous as the site associated with one of the world's most valuable postage stamps, the Treskilling Yellow issued on July 13, 1857.