Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$647,919$302 / 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 94How 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
Last sold for $380,000 on Jun 1, 2016

20 SWALLOW LN

DUNSTABLE, MA 01827
4
Beds
2.5
Baths
2,145 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.
2.03 ac
Lot SizeThe size of the land the home sits on, from county records.
1986
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$648K
$611K low$685K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$380,000 · Jun 1, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,336 (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.$533,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$214,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$318,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$623,105

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.59 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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
Lot (acres)The size of the land the home sits on, from county records.2.03
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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(10)

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 · 3.2 mi
M
Groton - Dunstable Regional Middle SchoolB+
Middle · Grades 5–8 · 6.3 mi
E
Florence Roche Elementary SchoolA
Elementary · Grades KG–4 · 6.3 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%

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

20 Swallow Ln 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 less than 69% of homes in Dunstable 01827
  • Costs less per square foot than 90% of homes in Middlesex County
  • Smaller than 70% of homes in Dunstable 01827
  • Has a bigger lot than 89% of homes in Middlesex County
  • Newer than 78% 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
$440K$1.4M

This home is worth more than 31% 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$647,919
CheaperTypical $727,106Pricier

Pricier than 31% of homes nearby

Price per ft²$302
CheaperTypical $291Pricier

Pricier than 59% of homes nearby

Living area2,145 ft²
SmallerTypical 2,576 ft²Bigger

Bigger than 30% of homes nearby

Lot size2.03 ac
SmallerTypical 2.04 acBigger

Bigger than 49% of homes nearby

Year built1986
OlderTypical 1987Newer

Newer than 49% of homes nearby

How 20 Swallow Ln ranks against every home in each area.
MeasureThis homeDunstable 01827Middlesex County
Estimated valuepricier than$647,91931% of homes32% of homes
Price per ft²pricier than$30259% of homes10% of homes
Living areabigger than2,145 ft²30% of homes62% of homes
Lot sizebigger than2.03 ac49% of homes89% of homes
Year builtnewer than198649% of homes78% of homes

About 20 Swallow Ln

How much is 20 Swallow Ln, Dunstable, MA worth?

The TopHap Estimate for 20 Swallow Ln, Dunstable, MA is $647,919 as of Aug 30, 2026. The likely range is $611,204 to $684,634. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Swallow Ln, Dunstable, MA last sell?

20 Swallow Ln, Dunstable, MA last sold on Jun 1, 2016 for $380,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 20 Swallow Ln, Dunstable, MA?

20 Swallow Ln, Dunstable, MA has 4 bedrooms, 2.5 bathrooms, 2,145 square feet of living space and a 2.03-acre lot.

When was 20 Swallow Ln, Dunstable, MA built?

20 Swallow Ln, Dunstable, MA was built in 1986, making it 40 years old. It is a colonial home. The building has 2 stories.

What schools serve 20 Swallow Ln, Dunstable, MA?

20 Swallow Ln, 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 20 Swallow Ln, Dunstable, MA compare to other homes in Dunstable 01827?

Among the 1,159 homes in Dunstable 01827, it is worth more than 31% of them ($647,919 against a typical $727,106), its price per square foot is higher than 59% of them ($302 against a typical $291), it is bigger than 30% of them (2,145 ft² against a typical 2,576 ft²), its lot is bigger than 49% of them (2.03 ac against a typical 2.04 ac) and it is newer than 49% of them (1986 against a typical 1987). Measured against all of Middlesex County, it is worth more than 32% 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 20 Swallow Ln, Dunstable, MA?

The 2025 property tax bill for 20 Swallow Ln, Dunstable, MA was $7,336. The county assessed it at $533,500.

More homes on Swallow Ln

Closest homes

More homes in Dunstable 01827

Assigned schools

Explore the area

See this home in context

Open 20 Swallow Ln 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