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is a town in Berkshire County, Massachusetts, United States. The population was 821 at the 2000 census.
Originally known as Northern Berkshire Township Number 2 and including all of Hinsdale and part of Middlefield, the town was first settled in 1767 and was officially incorporated as Partridgefield in 1771. Originally named for Oliver Partridge, one of the three purchasers of the town (along with Governor Francis Bernard), the name was officially changed to Peru in 1805, possibly because of its high altitude.