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is a town in Merrimack County, New Hampshire, USA. The population was 3,931 at the 2000 census.
The central village in town, where over 42% of the population resides, is defined as the Pittsfield census-designated place (CDP), and is located on the Suncook River near the junction of New Hampshire Routes 28 and 107.
For many years prior to its 1782 incorporation, this town was an unnamed parish of Chichester. Like Pittsburg in the north, Pittsfield was named for William Pitt, Prime Minister of the United Kingdom, and a great friend of the Colonies prior to the American Revolution. The town was settled in 1768 by several families originally from Hampton. Founder John Cram built grist and sawmills here in the late 1700s. Since 1901, Globe Manufacturing has made protective clothing for firefighters here.
The town claimed the Guinness World Record in July, 2001, as the place where the most number of people wore Groucho Marx glasses at the same time (522). Before Pittsfield's attempt, no other town had tried to set the record.