Population 22,649 · Census ACS 2020–24
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Population and households in Merrimack
Household size in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 2.83 | 2.52 | 2.68 |
| 2010–14 | 2.84 | 2.50 | 2.73 |
| 2015–19 | 2.73 | 2.49 | 2.71 |
| 2020–24 | 2.79 | 2.51 | 2.65 |
| Change | −0.04 | −0.01 | −0.03 |
Households in Merrimack average 2.79 people, a bit above the national 2.65, so families with children are somewhat more common here. Household size has edged down from 2.83 in 2006–10, as it has nationally. Households are largest in the southwest and smallest in the southeast.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 40.7 | 40.6 | 37.7 |
| 2010–14 | 41.3 | 42.1 | 38.6 |
| 2015–19 | 42.8 | 43.3 | 39.6 |
| 2020–24 | 42.2 | 44.2 | 40.1 |
| Change | +1.5 | +3.5 | +2.3 |
Merrimack skews a little older than the country: its median age is 42.2, against 40.1 nationally. Still, the population here is younger than in New Hampshire as a whole, where the median age is 44.2. The median age has climbed from 40.7 in 2006–10, as it has nationally.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 7.7% | 9.4% | 12.3% |
| 2010–14 | 8.0% | 9.5% | 12.3% |
| 2015–19 | 8.6% | 8.9% | 11.6% |
| 2020–24 | 6.5% | 8.5% | 11.6% |
| Change | −1.2 pts | −0.9 pts | −0.6 pts |
Single parents head only 6.5% of households in Merrimack, well below the national share of 11.6%. Since 2006–10, the single-parent share has edged down 1.2 points, mirroring the country.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Merrimack
Renters in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 5.9% | 27.4% | 33.3% |
| 2010–14 | 8.3% | 29.0% | 35.6% |
| 2015–19 | 8.6% | 28.9% | 36.0% |
| 2020–24 | 6.3% | 27.2% | 34.8% |
| Change | +0.4 pts | −0.1 pts | +1.5 pts |
Only 6.3% of households in Merrimack rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. About three in ten owners (30.7%) have paid off their mortgages, below the national share of 39.8%. Rentals cluster in the southeast; owners are most common in the northwest. Of the 68 New Hampshire cities with 5,000+ people, only five have a lower share of renters.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 4.8% | 12.6% | 11.4% |
| 2010–14 | 4.0% | 12.5% | 11.4% |
| 2015–19 | 2.3% | 12.7% | 11.1% |
| 2020–24 | 3.5% | 11.7% | 9.6% |
| Change | −1.3 pts | −0.9 pts | −1.8 pts |
Only 3.5% of homes in Merrimack are vacant, far below the national rate of 9.6%, which usually means strong demand for housing. Vacancy is down 1.3 points from 2006–10, mirroring the country. Merrimack has a lower vacancy rate than at least four in five New Hampshire cities.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 1980 | 1971 | 1974 |
| 2010–14 | 1981 | 1972 | 1975 |
| 2015–19 | 1981 | 1973 | 1977 |
| 2020–24 | 1984 | 1976 | 1980 |
| Change | +4 | +5 | +6 |
Homes in Merrimack are a bit newer than the national norm: the median home was built in 1984, versus 1980 across the U.S. The median year built has moved up from 1980 in 2006–10, a sign of steady new building. The newest homes are mostly in the southeast, the oldest in the northeast.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | $1,287 | $1,018 | $965 |
| 2010–14 | $1,378 | $1,094 | $1,040 |
| 2015–19 | $1,465 | $1,224 | $1,213 |
| 2020–24 | $1,900 | $1,597 | $1,571 |
| Change | +$613 | +$580 | +$606 |
A typical rental in Merrimack costs $1,900 a month with utilities, well above the national median of $1,571. Rents are up $613 a month from 2006–10, a 48% rise, a slower climb than the nation's. Rent takes 32.5% of the typical renter's income, just over the 30% mark often used to define affordable rent. Renters on a budget will find the lowest rents in the northwest; the highest are in the east.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Merrimack
Bachelor's degrees in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 44.2% | 33.5% | 28.4% |
| 2010–14 | 45.7% | 35.0% | 29.6% |
| 2015–19 | 49.0% | 37.6% | 32.1% |
| 2020–24 | 51.6% | 41.1% | 35.6% |
| Change | +7.4 pts | +7.6 pts | +7.2 pts |
College graduates are unusually common in Merrimack: 51.6% of adults 25 and older have a bachelor's degree or higher, against 35.6% nationally. Education tends to track local incomes and the kinds of jobs nearby. Since 2006–10, the share with a degree has risen 7.4 points, mirroring the country.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 94.7% | 91.0% | 84.9% |
| 2010–14 | 96.5% | 92.0% | 86.1% |
| 2015–19 | 97.2% | 93.1% | 87.7% |
| 2020–24 | 97.0% | 94.5% | 89.3% |
| Change | +2.3 pts | +3.5 pts | +4.3 pts |
Finishing high school is nearly universal in Merrimack: 97.0% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. The share with a diploma is up 2.3 points from 2006–10, as it has nationally.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Merrimack
| Period | Merrimack | New Hampshire | U.S. |
|---|---|---|---|
| 2006–10 | 4.9% | 5.9% | 8.1% |
| 2010–14 | 4.5% | 6.6% | 9.4% |
| 2015–19 | 3.3% | 3.6% | 5.6% |
| 2020–24 | 2.5% | 3.4% | 5.4% |
| Change | −2.5 pts | −2.5 pts | −2.7 pts |
Unemployment in Merrimack has been low: just 2.5% of the labor force was out of work and looking, well below the national rate of 5.4%. Unemployment has fallen 2.5 points since 2006–10, mirroring the country. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Merrimack compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Merrimack | 2.79 | 42.2 | 6.5% | 6.3% | 3.5% | 1984 | $1,900 | 51.6% | 97.0% | 2.5% |
| East Merrimack | 1.94 | 42.1 | 8.5% | 29.6% | 6.3% | 1986 | $2,019 | 42.3% | 95.8% | 0.1% |
| Amherst | 2.64 | 46.2 | 3.1% | 8.3% | 1.1% | 1979 | $1,741 | 65.8% | 99.4% | 1.5% |
| Litchfield | 2.81 | 43.9 | 5.5% | 12.1% | 2.5% | 1990 | $1,834 | 45.8% | 94.9% | 4.4% |
| Bedford | 2.91 | 46.3 | 7.6% | 17.4% | 3.5% | 1989 | $2,133 | 63.9% | 97.2% | 1.6% |
| Londonderry | 2.73 | 42.3 | 9.2% | 14.1% | 4.6% | 1988 | $1,928 | 48.2% | 97.1% | 4.8% |
| Milford | 2.50 | 39.4 | 11.5% | 36.5% | 4.4% | 1980 | $1,562 | 34.9% | 95.4% | 2.4% |
| Nashua | 2.52 | 41.6 | 11.5% | 44.1% | 5.7% | 1968 | $1,894 | 41.0% | 91.8% | 4.4% |
| Hudson | 2.56 | 45.9 | 5.9% | 18.2% | 3.6% | 1982 | $1,790 | 33.1% | 94.9% | 4.1% |
| Mont Vernon | 3.01 | 43.0 | 7.4% | 4.8% | 7.3% | 1979 | $1,154 | 51.5% | 96.1% | 2.2% |
| Hollis | 2.65 | 47.3 | 5.8% | 8.5% | 2.3% | 1982 | $2,208 | 57.3% | 97.2% | 2.0% |
All figures 2020–24.
Cities with similar populations: Woodinville, WA · Alpine, CA · Alsip, IL · Altoona, IA · Alum Rock, CA · Amherst, OH · Arcata, CA · Beaufort, SC · North Tustin, CA · Palm River-Clair Mel, FL
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Merrimack. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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