Merrimack County, New Hampshire

Merrimack County: County in New Hampshire, United States

About

Merrimack County is a county located in the U.S. state of New Hampshire. As of the 2010 census, the population was 146,445 and a population density of 59 people per km². After 10 years in 2020 county had an estimated population of 152,622 inhabitants. Its county seat is Concord. The county was created 202 years ago in 1822.

Merrimack County locator map
Location of Merrimack County on New Hampshire map.

Quick Facts about Merrimack County

Population : 152,622 (2020)
Country : United States of America
State : New Hampshire (United States)
Different from : Merrick County
Area : 2477 km2
Water as percent of area : 2.3%
Land as percent of area : 97.7%
Named for : Merrimack River
Altitude : 440 feet / 134 meters
Capital : Concord
Establishment : January 01, 1823
Time Zone : America/New_York
Local time : 03:40:05 (22nd February 2025)
Density : 62 Pop. per km² as of 2020
Population growth : 4.05% (2010-2020)
ConcordNH MerrimackCountyCourthouse 02 image
ConcordNH MerrimackCountyCourthouse 02
ConcordNH MerrimackCountyCourthouse 02 image
ConcordNH MerrimackCountyCourthouse 02 image

Geography

Merrimack County is located at 43°17'52"N 71°40'49"W (43.2976500, -71.6801900). It has 6 neighbors: Hillsborough County, Belknap County, Grafton County, Rockingham County, Strafford County and Sullivan County.

Merrimack County map

Click "full screen" full screen map icon to open full mode. View satellite images

The largest city of Merrimack County is Concord with a population of 43,924. Other cities include, East Concord population 42,605, Hooksett population 14,703, Franklin population 8,753 and Bow Bog population 8,381. See all Merrimack County cities & populated places.

Merrimack County Populated Places (more)

Cities, towns, neighborhoods & other populated places in Merrimack County.

City Name Population Title
Concord 43,924 The capital of New Hampshire.
East Concord 42,605 A census-designated place in Merrimack County, New Hampshire.
Hooksett 14,703 City in Merrimack County, New Hampshire, United States of America
Newmarket 9,207 Town in New Hampshire
Franklin 8,753 City in Merrimack County, New Hampshire, USA
Bow Bog 8,381 City in Merrimack County, New Hampshire, United States of America
Bow 8,063 Town in Merrimack County, New Hampshire, United States
Pembroke 7,252 Town in New Hampshire, United States
Hopkinton 5,827 Town in Merrimack County, New Hampshire
Loudon 5,697 Town of the United States
South Hooksett 5,418 Census-designated place in Merrimack County, New Hampshire
Suncook 5,379 Census-designated place in Merrimack County, New Hampshire
Henniker 5,006 Town in New Hampshire
Northfield 4,979 Town in Merrimack County, New Hampshire
Epsom 4,824 Epsom, New Hampshire
Allenstown 4,488 Town in New Hampshire

Merrimack County has 6 neighbours.

  • Pembroke
  • Webster
  • New London
  • Northfield
  • Bow
  • Danbury
  • Hopkinton
  • Andover
  • Hill
  • Concord
  • Bradford
  • Newbury
  • Salisbury
  • Loudon
  • Dunbarton
  • Henniker
  • Allenstown
  • Boscawen
  • Chichester
  • Wilmot
  • Epsom
  • Canterbury
  • Warner
  • Hooksett
  • Franklin
  • Pittsfield
  • Sutton

Demographics

The population of Merrimack County increased by 4.05% in 10 years.

Year Population % Change Method
2010 146,445 - census
2011 146,867 0.29% estimation process
2012 147,105 0.16% estimation process
2013 147,497 0.27% estimation process
2014 148,161 0.45% estimation process
2015 148,649 0.33% estimation process
2016 149,063 0.28% estimation process
2017 149,830 0.51% estimation process
2018 150,650 0.54% estimation process
2019 151,391 0.49% estimation process
2020 152,622 0.81% estimation process

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New Hampshire Other Counties (more counties)

County Name Population Title
Hillsborough County 418,735 The most populous county in the U.
Rockingham County 311,307 County in New Hampshire, United States
Strafford County 131,533 County in New Hampshire, United States
Manchester 112,546 The most populous city in Hillsborough County, New Hampshire.
City of Manchester 109,565 The most populous city in Hillsborough County, New Hampshire.
Grafton County 90,691 County in New Hampshire, United States
Nashua 89,167 The most populous city in Hillsborough County, New Hampshire.
Cheshire County 76,228 County in New Hampshire, United States
Belknap County 61,551 County in New Hampshire, United States
Carroll County 49,167 County in New Hampshire, United States
Concord 43,924 The capital of New Hampshire.
Sullivan County 43,267 County in New Hampshire, United States
East Concord 42,605 A census-designated place in Merrimack County, New Hampshire.
Derry Village 34,539 City in Rockingham County, New Hampshire, United States of America
Derry 33,442 Town in New Hampshire, United States
Dover 32,443 County seat city in Strafford County, New Hampshire, United States