County · New Hampshire
Merrimack County, New Hampshire
Merrimack County, New Hampshire. Merrimack County had 158,078 residents in 2025 by the Census Bureau's estimate, up 2.8% since 2020, in line with New Hampshire (+2.7%). It holds 39 places (2 cities, villages and boroughs, 25 towns and townships and 12 census-designated) and 39 census tracts. GEOID 33013.
Merrimack County is the county of the Concord, NH micropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
158,078
Census Bureau estimate (no margin published)
2020 Census count: 153,808 · ACS 2020-2024: 155,967
Median household income
$97,004
±$2,796 (90% margin)
New Hampshire: $99,031
Median home value
$367,600
±$6,350 (90% margin)
New Hampshire: $402,500
Median gross rent
$1,360
±$37 (90% margin)
New Hampshire: $1,491
How many people live in Merrimack County, and is it growing?
The 2020 Census counted 153,808 residents in Merrimack County. The Census Bureau estimates 158,078 for July 1, 2025, up 2.8% since 2020, in line with New Hampshire (+2.7%). The 2020-2024 American Community Survey puts the population at 155,967 over 933 square miles of land.
| Measure | Merrimack County | New Hampshire | Change since 2015-2019 |
|---|---|---|---|
| Total population | 155,967 | 1,394,868 | +6,050 |
| Households | 60,901±490 | 555,822 | +2,449 |
| Average household size | 2.46±0.02 | 2.44 | no clear change |
| Housing units | 66,497±92 | 648,472 | +1,537 |
Merrimack County's population since 2000
From 136,225 in 2000 to 158,078 in 2025: up 16.0%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Merrimack County?
Merrimack County holds 39 places: 2 cities, villages and boroughs (incorporated places), 25 towns and townships (county subdivisions with their own government) and 12 census-designated places. The largest is Concord with 44,597 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Concord | 43,976 | $84,902 |
|---|---|---|
| Hooksett | 14,871 | $117,962 |
| Franklin | 8,741 | $71,648 |
| Bow | 8,229 | $172,857 |
| Pembroke | 7,207 | $89,519 |
| Henniker | 6,185 | $95,206 |
| Hopkinton | 5,914 | $137,477 |
| South Hooksett | 5,888 | $130,000 |
| Loudon | 5,576 | $106,966 |
| Suncook | 5,501 | $79,836 |
| Hooksett CDP | 5,283 | $101,053 |
| Northfield | 4,872 | $92,917 |
| Epsom | 4,834 | $97,941 |
| Allenstown | 4,707 | $72,500 |
| New London | 4,400 | $107,773 |
| Pittsfield | 4,075 | $74,318 |
| Boscawen | 3,998 | $77,328 |
| Henniker CDP | 3,166 | $76,326 |
| Dunbarton | 3,005 | $124,348 |
| Warner | 2,937 | $94,022 |
| Chichester | 2,665 | $109,297 |
| Andover | 2,406 | $88,514 |
| Canterbury | 2,389 | $129,333 |
| Newbury | 2,172 | $116,477 |
| Sutton | 1,978 | $130,313 |
| Webster | 1,913 | $107,171 |
| Bradford | 1,662 | $108,015 |
| Pittsfield CDP | 1,570 | $60,144 |
| Tilton Northfield | 3,324 | $66,705 |
| Contoocook | 1,427 | $97,928 |
| Salisbury | 1,422 | $111,591 |
| Wilmot | 1,407 | $117,759 |
| New London CDP | 1,266 | not published |
| Danbury | 1,250 | $71,685 |
| Hill | 1,017 | $82,125 |
| Loudon CDPGEOID 3343300 | 711 | $106,486 |
| Warner CDPGEOID 3378500 | 453 | $47,885 |
| Bradford CDP | 372 | $84,375 |
| Blodgett LandingGEOID 3306020 | 152 | not published |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Merrimack County?
The median resident of Merrimack County is 42.9 years old; 18.4% are under 18 and 19.9% are 65 or older. The largest group is non-Hispanic white residents at 90.1%, then non-Hispanic residents of two or more races at 3.6%. 4.4% of residents were born outside the United States.
| Measure | Merrimack County | New Hampshire | Change since 2015-2019 |
|---|---|---|---|
| Median age | 42.9±0.3 | 43.3 | no clear change |
| Under 18 years | 18.4% | 18.2% | – |
| 65 years and over | 19.9%±0.1 pts | 20.1% | – |
| Hispanic or Latino (any race) | 2.7% | 4.7% | +0.5 pts |
| White alone, not Hispanic | 90.1%±0.3 pts | 86.9% | −2.3 pts |
| Black or African American alone, not Hispanic | 1.6%±0.2 pts | 1.3% | no clear change |
| Asian alone, not Hispanic | 1.5%±0.2 pts | 2.6% | −0.6 pts |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 3.6%±0.4 pts | 4.0% | – |
| Some other race alone, not Hispanic | 0.4%±0.2 pts | 0.4% | – |
| Born outside the United States | 4.4%±0.5 pts | 6.1% | −0.8 pts |
| Speak a language other than English at home (age 5+) | 5.3%±0.4 pts | 7.9% | – |
| Civilian veterans (age 18+) | 8.1%±0.5 pts | 7.6% | – |
| With a disability | 14.7%±0.7 pts | 13.3% | – |
| No health insurance coverage | 5.1%±0.6 pts | 5.3% | no clear change |
| High school graduate or higher (age 25+) | 94.5%±0.5 pts | 94.4% | – |
| Bachelor's degree or higher (age 25+) | 38.9%±1.2 pts | 40.6% | +3.3 pts |
| Graduate or professional degree (age 25+) | 16.2%±0.8 pts | 16.1% | – |
| Moved from another state in the past year | 2.7%±0.5 pts | 3.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Merrimack County earn?
Half of Merrimack County's 60,901 households earn less than $97,004 a year (±$2,796), against $99,031 in New Hampshire. In 2015-2019 the median was $93,209 in 2024 dollars, so it rose by $3,795 after inflation. 7.6% of residents live below the poverty line.
| Measure | Merrimack County | New Hampshire | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $97,004±$2,796 | $99,031 | +$3,795 |
| Mean household income | $123,673±$3,700 | $128,322 | – |
| Per capita income | $49,044±$1,465 | $52,798 | +$3,057 |
| People below the poverty line | 7.6%±0.8 pts | 7.2% | +1.1 pts |
| Children under 18 below the poverty line | 7.7%±1.7 pts | 7.9% | no clear change |
| Households receiving SNAP | 7.0%±0.9 pts | 6.1% | – |
| Households with a broadband subscription | 92.8%±0.8 pts | 92.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Merrimack County?
Owners occupy 73.5% of Merrimack County's occupied homes and renters 26.5%. The median owner-occupied home is valued at $367,600 by its owner (±$6,350). The median renter pays $1,360 a month including utilities, and 36.6% of renters pay 35% or more of their income on rent.
| Measure | Merrimack County | New Hampshire | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $367,600±$6,350 | $402,500 | +$75,187 |
| Median gross rent | $1,360±$37 | $1,491 | +$78 |
| Renters paying 35% or more of income on rent | 36.6%±3.0 pts | 38.4% | no clear change |
| Median monthly owner costs, with a mortgage | $2,324±$40 | $2,367 | – |
| Owner-occupied homes | 73.5%±1.1 pts | 72.8% | +1.7 pts |
| Housing units | 66,497±92 | 648,472 | +1,537 |
| Homeowner vacancy rate | 0.2%±0.1 pts | 0.4% | – |
| Rental vacancy rate | 4.5%±1.3 pts | 4.0% | – |
| Single-family detached homes | 63.1%±1.1 pts | 63.3% | – |
| Mobile homes | 6.8%±0.7 pts | 5.2% | – |
| Built 2020 or later | 1.2%±0.3 pts | 1.3% | – |
| Built 1939 or earlier | 24.3%±1.2 pts | 18.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Merrimack County building?
Builders took permits for 286 new housing units across Merrimack County in 2025 (248 single-family), 1.8 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Merrimack County get to work?
73.1% of Merrimack County's workers drive alone and 14.4% work from home. The average trip to work takes 26.6 minutes. The unemployment rate in 2020-2024 averaged 3.1%.
| Measure | Merrimack County | New Hampshire | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 64.5%±0.9 pts | 66.3% | – |
| Unemployment rate | 3.1%±0.5 pts | 3.3% | no clear change |
| Drove alone to work | 73.1%±1.2 pts | 72.0% | – |
| Carpooled | 8.2%±0.9 pts | 7.0% | – |
| Public transportation | 0.2%±0.1 pts | 0.5% | – |
| Walked | 2.8%±0.5 pts | 2.3% | – |
| Worked from home | 14.4%±1.0 pts | 16.8% | +7.3 pts |
| Mean travel time to work | 26.6 min±0.7 | 26.7 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Merrimack County's census tracts?
Merrimack County is divided into 39 census tracts. Among those with a reliable estimate, median household income runs from $56,488 (Tract 430.01) to $175,455 (Tract 310.02).
All 39 census tracts of Merrimack County, with their figures
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Merrimack County compare with New Hampshire's other counties?
| Measure | Rank |
|---|---|
| Population | 3rd of 10 |
| Growth 2020-2025 | 4th of 10 |
| Residents per square mile | 4th of 10 |
| Median household income | 3rd of 10 |
| Median home value | 5th of 10 |
| Median gross rent | 4th of 10 |
| Poverty rate | 7th of 10 |
| Bachelor's degree or higher | 5th of 10 |
| Median age | 8th of 10 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Merrimack County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.