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Single Family ResidenceResidential
$651,696$255 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 93How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026

21 DERRY ST

MERRIMACK, NH 03054
3
Beds
2
Baths
2,560 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.47 ac
Lot SizeThe size of the land the home sits on, from county records.
1971
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$652K
$608K low$695K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,980 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$451,400 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$198,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$253,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$590,900

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.48
50
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
25
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
54
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
87
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
25
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.14 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Split Foyer
CountyHILLSBOROUGH
Lot (acres)The size of the land the home sits on, from county records.0.47
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.In-Ground Pool

Transaction History(4)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
James Mastricola Elementary SchoolB
Elementary · Grades PK–4 · 1.2 mi
M
Merrimack Middle SchoolC+
Middle · Grades 7–8 · 1.3 mi
H
Merrimack High SchoolC
High · Grades 9–12 · 1.4 mi

District: Merrimack School District

Neighborhood · ZIP 03054These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.49
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.88

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.27,283
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.817 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$123,868
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$143,079
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.45 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

21 Derry St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 75% of homes in Hillsborough County
  • Costs less per square foot than 77% of homes in Hillsborough County
  • Bigger than 80% of homes in Hillsborough County
  • Has a smaller lot than 65% of homes in Merrimack 03054
  • Older than 76% of homes in Merrimack 03054

What homes are worth in Merrimack 03054

Each bar is how many homes fall in that price range. The marker is this home.

This home
$278K$955K

This home is worth more than 74% of homes in Merrimack 03054.

How it measures up in Merrimack 03054

The dot is this home. The mark in the middle is the typical home in Merrimack 03054.

Estimated value$651,696
CheaperTypical $549,094Pricier

Pricier than 74% of homes nearby

Price per ft²$255
CheaperTypical $263Pricier

Pricier than 41% of homes nearby

Living area2,560 ft²
SmallerTypical 2,006 ft²Bigger

Bigger than 72% of homes nearby

Lot size0.47 ac
SmallerTypical 0.62 acBigger

Bigger than 35% of homes nearby

Year built1971
OlderTypical 1984Newer

Newer than 24% of homes nearby

How 21 Derry St ranks against every home in each area.
MeasureThis homeMerrimack 03054Hillsborough County
Estimated valuepricier than$651,69674% of homes75% of homes
Price per ft²pricier than$25541% of homes23% of homes
Living areabigger than2,560 ft²72% of homes80% of homes
Lot sizebigger than0.47 ac35% of homes46% of homes
Year builtnewer than197124% of homes38% of homes

About 21 Derry St

How much is 21 Derry St, Merrimack, NH worth?

The TopHap Estimate for 21 Derry St, Merrimack, NH is $651,696 as of Aug 30, 2026. The likely range is $608,275 to $695,117. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Derry St, Merrimack, NH last sell?

21 Derry St, Merrimack, NH last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Derry St, Merrimack, NH?

21 Derry St, Merrimack, NH has 3 bedrooms, 2 bathrooms, 2,560 square feet of living space and a 0.47-acre lot.

When was 21 Derry St, Merrimack, NH built?

21 Derry St, Merrimack, NH was built in 1971, making it 55 years old. It is a split foyer home. The building has 1 story.

What schools serve 21 Derry St, Merrimack, NH?

21 Derry St, Merrimack, NH is assigned to James Mastricola Elementary School (elementary), rated B; Merrimack Middle School (middle), rated C+; Merrimack High School (high), rated C. All sit in Merrimack School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Derry St, Merrimack, NH compare to other homes in Merrimack 03054?

Among the 9,896 homes in Merrimack 03054, it is worth more than 74% of them ($651,696 against a typical $549,094), its price per square foot is higher than 41% of them ($255 against a typical $263), it is bigger than 72% of them (2,560 ft² against a typical 2,006 ft²), its lot is bigger than 35% of them (0.47 ac against a typical 0.62 ac) and it is newer than 24% of them (1971 against a typical 1984). Measured against all of Hillsborough County, it is worth more than 75% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 21 Derry St, Merrimack, NH?

The 2025 property tax bill for 21 Derry St, Merrimack, NH was $9,980. The county assessed it at $451,400.

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