Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$543,170$298 / 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 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026

21 COLLINS AVE

MERRIMACK, NH 03054
3
Beds
1.5
Baths
1,823 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.
0.6 ac
Lot SizeThe size of the land the home sits on, from county records.
1974
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$543K
$516K low$570K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,349 (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.$377,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$204,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$173,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$527,250

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.39
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
26
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
56
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.
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
CountyHILLSBOROUGH
Lot (acres)The size of the land the home sits on, from county records.0.60
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.Hot Water
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.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

Transaction History(2)

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
Reeds Ferry SchoolA-
Elementary · Grades PK–4 · 1.0 mi
H
Merrimack High SchoolB-
High · Grades 9–12 · 1.2 mi
M
Merrimack Middle SchoolC
Middle · Grades 7–8 · 2.3 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%

Owner Tools

Do you own this home?
Claim this home

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 Collins Ave 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.

  • Costs more per square foot than 76% of homes in Merrimack 03054
  • Older than 67% 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
$295K$954K

This home is worth more than 48% 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$543,170
CheaperTypical $549,136Pricier

Pricier than 48% of homes nearby

Price per ft²$298
CheaperTypical $265Pricier

Pricier than 76% of homes nearby

Living area1,823 ft²
SmallerTypical 2,018 ft²Bigger

Bigger than 40% of homes nearby

Lot size0.6 ac
SmallerTypical 0.62 acBigger

Bigger than 49% of homes nearby

Year built1974
OlderTypical 1984Newer

Newer than 33% of homes nearby

How 21 Collins Ave ranks against every home in each area.
MeasureThis homeMerrimack 03054Hillsborough County
Estimated valuepricier than$543,17048% of homes55% of homes
Price per ft²pricier than$29876% of homes42% of homes
Living areabigger than1,823 ft²40% of homes54% of homes
Lot sizebigger than0.6 ac49% of homes50% of homes
Year builtnewer than197433% of homes42% of homes

About 21 Collins Ave

How much is 21 Collins Ave, Merrimack, NH worth?

The TopHap Estimate for 21 Collins Ave, Merrimack, NH is $543,170 as of Sep 24, 2026. The likely range is $515,937 to $570,402. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Collins Ave, Merrimack, NH last sell?

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

How big is 21 Collins Ave, Merrimack, NH?

21 Collins Ave, Merrimack, NH has 3 bedrooms, 1.5 bathrooms, 1,823 square feet of living space and a 0.60-acre lot.

When was 21 Collins Ave, Merrimack, NH built?

21 Collins Ave, Merrimack, NH was built in 1974, making it 52 years old. The building has 2 stories.

What schools serve 21 Collins Ave, Merrimack, NH?

21 Collins Ave, Merrimack, NH is assigned to Reeds Ferry School (elementary), rated A-; Merrimack High School (high), rated B-; Merrimack Middle School (middle), rated C. All sit in Merrimack School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Collins Ave, Merrimack, NH compare to other homes in Merrimack 03054?

Among the 9,896 homes in Merrimack 03054, it is worth more than 48% of them ($543,170 against a typical $549,136), its price per square foot is higher than 76% of them ($298 against a typical $265), it is bigger than 40% of them (1,823 ft² against a typical 2,018 ft²), its lot is bigger than 49% of them (0.6 ac against a typical 0.62 ac) and it is newer than 33% of them (1974 against a typical 1984). Measured against all of Hillsborough County, it is worth more than 55% 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 Collins Ave, Merrimack, NH?

The 2025 property tax bill for 21 Collins Ave, Merrimack, NH was $8,349. The county assessed it at $377,600.

More homes on Collins Ave

Closest homes

More homes in Merrimack 03054

Assigned schools

Explore the area

See this home in context

Open 21 Collins Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map