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Single Family ResidenceResidential
$810,933$471 / 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 $423,000 on Feb 29, 2016

21 JOHN ST

SOUTHBOROUGH, MA 01772
3
Beds
3 / 1
Baths
1,722 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.
0.29 ac
Lot SizeThe size of the land the home sits on, from county records.
1954
Year BuiltThe year the home was originally built, according to county records.
1
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$811K
$765K low$857K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$423,000 · Feb 29, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,196 (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.$665,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$297,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$368,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$650,900
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$709,270

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.40
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
14
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
59
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
94
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
33
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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 Level
CountyWORCESTER
Lot (acres)The size of the land the home sits on, from county records.0.28
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
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(9)

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
P Brent TrottierA-
Middle · Grades 6–8 · 1.8 mi
E
Mary E Finn School
Elementary · Grades PK–1 · 2.2 mi
H
Algonquin Regional High SchoolA
High · Grades 9–12 · 5.8 mi

District: Southborough School District

Neighborhood · ZIP 01772These 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.32
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.63

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.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.10,867
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.705 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$180,666
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$225,158
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.50%

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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 John 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 90% of homes in Worcester County
  • Costs more per square foot than 97% of homes in Worcester County
  • Smaller than 75% of homes in Southborough 01772
  • Has a smaller lot than 96% of homes in Southborough 01772
  • Older than 84% of homes in Southborough 01772

What homes are worth in Southborough 01772

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

This home
$514K$2.2M

This home is worth more than 32% of homes in Southborough 01772.

How it measures up in Southborough 01772

The dot is this home. The mark in the middle is the typical home in Southborough 01772.

Estimated value$810,933
CheaperTypical $978,044Pricier

Pricier than 32% of homes nearby

Price per ft²$471
CheaperTypical $417Pricier

Pricier than 77% of homes nearby

Living area1,722 ft²
SmallerTypical 2,447 ft²Bigger

Bigger than 25% of homes nearby

Lot size0.29 ac
SmallerTypical 1 acBigger

Bigger than 4% of homes nearby

Year built1954
OlderTypical 1984Newer

Newer than 16% of homes nearby

How 21 John St ranks against every home in each area.
MeasureThis homeSouthborough 01772Worcester County
Estimated valuepricier than$810,93332% of homes90% of homes
Price per ft²pricier than$47177% of homes97% of homes
Living areabigger than1,722 ft²25% of homes51% of homes
Lot sizebigger than0.29 ac4% of homes31% of homes
Year builtnewer than195416% of homes37% of homes

About 21 John St

How much is 21 John St, Southborough, MA worth?

The TopHap Estimate for 21 John St, Southborough, MA is $810,933 as of Aug 30, 2026. The likely range is $764,993 to $856,872. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 John St, Southborough, MA last sell?

21 John St, Southborough, MA last sold on Feb 29, 2016 for $423,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 John St, Southborough, MA?

21 John St, Southborough, MA has 3 bedrooms, 3 bathrooms, 1,722 square feet of living space and a 0.28-acre lot.

When was 21 John St, Southborough, MA built?

21 John St, Southborough, MA was built in 1954, making it 72 years old. It is a split level home. The building has 1 story.

What schools serve 21 John St, Southborough, MA?

21 John St, Southborough, MA is assigned to P Brent Trottier (middle), rated A-; Mary E Finn School (elementary); Algonquin Regional High School (high), rated A. All sit in Southborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 John St, Southborough, MA compare to other homes in Southborough 01772?

Among the 3,253 homes in Southborough 01772, it is worth more than 32% of them ($810,933 against a typical $978,044), its price per square foot is higher than 77% of them ($471 against a typical $417), it is bigger than 25% of them (1,722 ft² against a typical 2,447 ft²), its lot is bigger than 4% of them (0.29 ac against a typical 1 ac) and it is newer than 16% of them (1954 against a typical 1984). Measured against all of Worcester County, it is worth more than 90% 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 John St, Southborough, MA?

The 2025 property tax bill for 21 John St, Southborough, MA was $9,196. The county assessed it at $665,900.

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