Merrimack County, New Hampshire

Merrimack County
County
Merrimack County Courthouse, 2019
Seal
Location within the U.S. state of New Hampshire
New Hampshire's location within the U.S.
Coordinates: 43°18′N 71°41′W / 43.3°N 71.68°W / 43.3; -71.68
Country	United States
State	New Hampshire
Founded	1823
Named for	Merrimack River
Seat	Concord
Largest city	Concord
Area
• Total	955.0 sq mi (2,473 km2)
• Land	932.9 sq mi (2,416 km2)
• Water	22.1 sq mi (57 km2)  2.3%
Population  (2020)
• Total	153,808
• Estimate  (2022)	156,020
• Density	164.9/sq mi (63.7/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional districts	1st, 2nd
Website	www.merrimackcounty.net

Merrimack County is a county in the U.S. state of New Hampshire. As of the 2020 Census, the population was 153,808,^[1] making it the third most populous county in New Hampshire. Its county seat is Concord,^[2] the state capital. The county was organized in 1823 from parts of Hillsborough and Rockingham counties,^[3] and is named for the Merrimack River.^[4] Merrimack County comprises the Concord, NH Micropolitan Statistical Area, which in turn constitutes a portion of the Boston–Worcester–Providence, MA–RI–NH–CT Combined Statistical Area. In 2010, the center of population of New Hampshire was located in Merrimack County, in the town of Pembroke.^[5]