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Single Family ResidenceResidential
$894,523$289 / 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 96How 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
Last sold for $515,000 on Sep 28, 2018

340 GROTON ST

DUNSTABLE, MA 01827
3
Beds
2.5
Baths
3,098 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.
2.02 ac
Lot SizeThe size of the land the home sits on, from county records.
1994
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$895K
$860K low$929K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$515,000 · Sep 28, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,433 (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.$686,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$221,200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$464,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$692,740

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.21 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
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.1 percent flood zone

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.Colonial
CountyMIDDLESEX
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.2005
Lot (acres)The size of the land the home sits on, from county records.2.02
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
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

H
Groton - Dunstable Regional High SchoolA
High · Grades 9–12 · 1.5 mi
M
Groton - Dunstable Regional Middle SchoolB+
Middle · Grades 5–8 · 4.4 mi
E
Florence Roche Elementary SchoolA
Elementary · Grades KG–4 · 4.4 mi

District: Groton-Dunstable School District

Neighborhood · ZIP 01827These 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.17
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.98
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.76

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.36%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.1.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.3,358
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.202 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$176,482
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$191,924
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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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

340 Groton 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 74% of homes in Dunstable 01827
  • Costs less per square foot than 93% of homes in Middlesex County
  • Bigger than 87% of homes in Middlesex County
  • Has a bigger lot than 89% of homes in Middlesex County
  • Newer than 84% of homes in Middlesex County

What homes are worth in Dunstable 01827

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

This home
$428K$1.4M

This home is worth more than 74% of homes in Dunstable 01827.

How it measures up in Dunstable 01827

The dot is this home. The mark in the middle is the typical home in Dunstable 01827.

Estimated value$894,523
CheaperTypical $754,715Pricier

Pricier than 74% of homes nearby

Price per ft²$289
CheaperTypical $301Pricier

Pricier than 40% of homes nearby

Living area3,098 ft²
SmallerTypical 2,582 ft²Bigger

Bigger than 75% of homes nearby

Lot size2.02 ac
SmallerTypical 2.04 acBigger

Bigger than 46% of homes nearby

Year built1994
OlderTypical 1987Newer

Newer than 66% of homes nearby

How 340 Groton St ranks against every home in each area.
MeasureThis homeDunstable 01827Middlesex County
Estimated valuepricier than$894,52374% of homes62% of homes
Price per ft²pricier than$28940% of homes7% of homes
Living areabigger than3,098 ft²75% of homes87% of homes
Lot sizebigger than2.02 ac46% of homes89% of homes
Year builtnewer than199466% of homes84% of homes

About 340 Groton St

How much is 340 Groton St, Dunstable, MA worth?

The TopHap Estimate for 340 Groton St, Dunstable, MA is $894,523 as of Sep 24, 2026. The likely range is $859,568 to $929,478. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 340 Groton St, Dunstable, MA last sell?

340 Groton St, Dunstable, MA last sold on Sep 28, 2018 for $515,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 340 Groton St, Dunstable, MA?

340 Groton St, Dunstable, MA has 3 bedrooms, 2.5 bathrooms, 3,098 square feet of living space and a 2.02-acre lot.

When was 340 Groton St, Dunstable, MA built?

340 Groton St, Dunstable, MA was built in 1994, making it 32 years old. It is a colonial home. The building has 2 stories.

What schools serve 340 Groton St, Dunstable, MA?

340 Groton St, Dunstable, MA is assigned to Groton - Dunstable Regional High School (high), rated A; Groton - Dunstable Regional Middle School (middle), rated B+; Florence Roche Elementary School (elementary), rated A. All sit in Groton-Dunstable School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 340 Groton St, Dunstable, MA compare to other homes in Dunstable 01827?

Among the 1,159 homes in Dunstable 01827, it is worth more than 74% of them ($894,523 against a typical $754,715), its price per square foot is higher than 40% of them ($289 against a typical $301), it is bigger than 75% of them (3,098 ft² against a typical 2,582 ft²), its lot is bigger than 46% of them (2.02 ac against a typical 2.04 ac) and it is newer than 66% of them (1994 against a typical 1987). Measured against all of Middlesex County, it is worth more than 62% 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 340 Groton St, Dunstable, MA?

The 2025 property tax bill for 340 Groton St, Dunstable, MA was $9,433. The county assessed it at $686,000.

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