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Coös County is the northern most and the largest county in the State of New Hampshire. Coös County makes up about 20% of the land area in New Hampshire, a total of 1,800 square miles. Our population in 2010 was only 33,019 or 2.5% of the State’s population. We invite you to explore our new website. We hope you will enjoy the new look, design and simplicity in navigating through our website.
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Public NoticeCoös County Planning Board
