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Triplex (3 Units, Any Combination)Residential
Last sold for $1 on Jul 27, 2011

21 RIVER ST

WESTFORD, MA 01886
4
Beds
3
Baths
2,536 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.
0.49 ac
Lot SizeThe size of the land the home sits on, from county records.
1940
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
12
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1 · Jul 27, 2011

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,171 (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.$606,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$294,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$312,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$577,700

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.19 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.Triplex (3 Units, Any Combination)
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.0.49
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
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.

M
Lloyd G. Blanchard Middle SchoolA-
Middle · Grades 6–8 · 1.0 mi
H
Westford AcademyA
High · Grades 9–12 · 1.2 mi
E
Rita E. Miller Elementary School
Elementary · Grades PK–2 · 3.6 mi

District: Westford School District

Neighborhood · ZIP 01886These 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.19
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.99
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.80

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.37%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.1.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.25,048
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.803 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$163,754
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$183,117
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.46 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

Ownership

Company ownedWhether the owner is a company or trust rather than a person.Yes

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 River 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.

  • Bigger than 75% of homes in Middlesex County
  • Has a smaller lot than 77% of homes in Westford 01886
  • Older than 90% of homes in Westford 01886

How it measures up in Westford 01886

The dot is this home. The mark in the middle is the typical home in Westford 01886.

Living area2,536 ft²
SmallerTypical 2,068 ft²Bigger

Bigger than 72% of homes nearby

Lot size0.49 ac
SmallerTypical 0.92 acBigger

Bigger than 23% of homes nearby

Year built1940
OlderTypical 1984Newer

Newer than 10% of homes nearby

How 21 River St ranks against every home in each area.
MeasureThis homeWestford 01886Middlesex County
Living areabigger than2,536 ft²72% of homes75% of homes
Lot sizebigger than0.49 ac23% of homes64% of homes
Year builtnewer than194010% of homes36% of homes

About 21 River St

When did 21 River St, Westford, MA last sell?

21 River St, Westford, MA last sold on Jul 27, 2011 for $1, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 River St, Westford, MA?

21 River St, Westford, MA has 4 bedrooms, 3 bathrooms, 2,536 square feet of living space and a 0.49-acre lot.

When was 21 River St, Westford, MA built?

21 River St, Westford, MA was built in 1940, making it 86 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 River St, Westford, MA?

21 River St, Westford, MA is assigned to Lloyd G. Blanchard Middle School (middle), rated A-; Westford Academy (high), rated A; Rita E. Miller Elementary School (elementary). All sit in Westford School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 River St, Westford, MA compare to other homes in Westford 01886?

Among the 8,171 homes in Westford 01886, it is bigger than 72% of them (2,536 ft² against a typical 2,068 ft²), its lot is bigger than 23% of them (0.49 ac against a typical 0.92 ac) and it is newer than 10% of them (1940 against a typical 1984). 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 River St, Westford, MA?

The 2025 property tax bill for 21 River St, Westford, MA was $8,171. The county assessed it at $606,600.

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