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Merrimack County was organized at Concord in 1823 and is named for the Merrimack River. It was formed by removing towns from northern Hillsborough and Rockingham Counties.

Merrimack County is a county in the U.S. state of New Hampshire which has two cities and twenty-five towns. As of the 2022 Census, the population was 156,020. Its county seat is Concord. 

Merrimack County has a total area of 956 square miles (2,476 km2), of which 934 sq mi (2,419 km2) is land and 22 sq mi (57 km2) (2.31%) is water. It is the third-largest county in New Hampshire by land area.  The highest point in Merrimack County is Mount Kearsarge, on the border of Warner and Wilmot, at 2,937 feet.




 

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82,457
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Median Households Income
1,113
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The Median
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2017-2021
152,983
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Population
255,100
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The Median
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