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CondominiumResidential
$857,067$792 / 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 86How 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

20 GREEN ST

WATERTOWN, MA 02472
3
Beds
1
Baths
1,082 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.
1830
Year BuiltThe year the home was originally built, according to county records.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$857K
$739K low$976K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,603 (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.$479,700 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$479,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$479,700

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.44
40
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
57
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
92
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
32
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.12 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.Condominium
CountyMiddlesex
HeatingThe type of heating system in the home.Forced Air

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

H
Watertown High SchoolB-
High · Grades 9–12 · 0.3 mi
M
Watertown Middle SchoolB-
Middle · Grades 6–8 · 0.3 mi
E
J. R. Lowell Elementary SchoolA-
Elementary · Grades KG–5 · 0.7 mi

District: Watertown School District

Neighborhood · ZIP 02472These 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.112
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 100.71

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.35,928
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,689 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$115,227
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$149,103
Average tempThe average temperature here across a full year.50°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

20 Green 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.

  • Costs more per square foot than 96% of homes in Watertown 02472
  • Smaller than 86% of homes in Middlesex County
  • Among the oldest homes in Watertown 02472

What homes are worth in Watertown 02472

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

This home
$373K$1.7M

This home is worth more than 56% of homes in Watertown 02472.

How it measures up in Watertown 02472

The dot is this home. The mark in the middle is the typical home in Watertown 02472.

Estimated value$857,067
CheaperTypical $815,275Pricier

Pricier than 56% of homes nearby

Price per ft²$792
CheaperTypical $587Pricier

Pricier than 96% of homes nearby

Living area1,082 ft²
SmallerTypical 1,728 ft²Bigger

Bigger than 19% of homes nearby

Year built1830
OlderTypical 1930Newer

Older than almost all homes nearby

How 20 Green St ranks against every home in each area.
MeasureThis homeWatertown 02472Middlesex County
Estimated valuepricier than$857,06756% of homes58% of homes
Price per ft²pricier than$79296% of homes92% of homes
Living areabigger than1,082 ft²19% of homes14% of homes
Year builtnewer than1830almost no homesalmost no homes

About 20 Green St

How much is 20 Green St, Watertown, MA worth?

The TopHap Estimate for 20 Green St, Watertown, MA is $857,067 as of Aug 30, 2026. The likely range is $738,616 to $975,518. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 20 Green St, Watertown, MA?

20 Green St, Watertown, MA has 3 bedrooms, 1 bathrooms and 1,082 square feet of living space.

When was 20 Green St, Watertown, MA built?

20 Green St, Watertown, MA was built in 1830, making it 196 years old.

What schools serve 20 Green St, Watertown, MA?

20 Green St, Watertown, MA is assigned to Watertown High School (high), rated B-; Watertown Middle School (middle), rated B-; J. R. Lowell Elementary School (elementary), rated A-. All sit in Watertown School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Green St, Watertown, MA compare to other homes in Watertown 02472?

Among the 10,041 homes in Watertown 02472, it is worth more than 56% of them ($857,067 against a typical $815,275), its price per square foot is higher than 96% of them ($792 against a typical $587), it is bigger than 19% of them (1,082 ft² against a typical 1,728 ft²) and it is newer than almost none of them (1830 against a typical 1930). Measured against all of Middlesex County, it is worth more than 58% 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 Green St, Watertown, MA?

The 2025 property tax bill for 20 Green St, Watertown, MA was $5,603. The county assessed it at $479,700.

More homes on Green St

More homes in Watertown 02472

Assigned schools

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