Concord is the capital city of the U.S. state of New Hampshire and the seat of Merrimack County. As of the 2020 United States census the popul…Concord is the capital city of the U.S. state of New Hampshire and the seat of Merrimack County. As of the 2020 United States census the population was 43,976, making it the 3rd most populous city in New Hampshire after Manchester and Nashua.
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