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Single Family ResidenceResidential
$1,115,390$531 / 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 97How 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

666 MAIN ST

WATERTOWN, MA 02472
4
Beds
2
Baths
2,100 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.
0.26 ac
Lot SizeThe size of the land the home sits on, from county records.
1937
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.1M
$1.1M low$1.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,936 (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.$850,700 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$453,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$397,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,040,725

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.0.26
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.Steam
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(5)

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.

E
Cunniff Elementary SchoolA
Elementary · Grades KG–5 · 0.4 mi
M
Watertown Middle SchoolB-
Middle · Grades 6–8 · 0.7 mi
H
Watertown High SchoolB-
High · Grades 9–12 · 1.4 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

666 Main 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 85% of homes in Watertown West End
  • Costs less per square foot than 74% of homes in Watertown West End
  • Bigger than 68% of homes in Watertown West End
  • Has a bigger lot than 81% of homes in Watertown West End
  • Older than 66% of homes in Middlesex County

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$1.8M

This home is worth more than 83% 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$1,115,390
CheaperTypical $815,478Pricier

Pricier than 83% of homes nearby

Price per ft²$531
CheaperTypical $587Pricier

Pricier than 30% of homes nearby

Living area2,100 ft²
SmallerTypical 1,724 ft²Bigger

Bigger than 62% of homes nearby

Lot size0.26 ac
SmallerTypical 0.14 acBigger

Bigger than 77% of homes nearby

Year built1937
OlderTypical 1930Newer

Newer than 57% of homes nearby

How 666 Main St ranks against every home in each area.
MeasureThis homeWatertown West EndWatertown 02472Middlesex County
Estimated valuepricier than$1,115,39085% of homes83% of homes76% of homes
Price per ft²pricier than$53126% of homes30% of homes65% of homes
Living areabigger than2,100 ft²68% of homes62% of homes61% of homes
Lot sizebigger than0.26 ac81% of homes77% of homes45% of homes
Year builtnewer than193745% of homes57% of homes34% of homes

About 666 Main St

How much is 666 Main St, Watertown, MA worth?

The TopHap Estimate for 666 Main St, Watertown, MA is $1,115,390 as of Aug 30, 2026. The likely range is $1,085,744 to $1,145,037. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 666 Main St, Watertown, MA last sell?

666 Main St, Watertown, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 666 Main St, Watertown, MA?

666 Main St, Watertown, MA has 4 bedrooms, 2 bathrooms, 2,100 square feet of living space and a 0.26-acre lot.

When was 666 Main St, Watertown, MA built?

666 Main St, Watertown, MA was built in 1937, making it 89 years old. It is a colonial home. The building has 2 stories.

What schools serve 666 Main St, Watertown, MA?

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

How does 666 Main St, Watertown, MA compare to other homes in Watertown 02472?

Among the 10,041 homes in Watertown 02472, it is worth more than 83% of them ($1,115,390 against a typical $815,478), its price per square foot is higher than 30% of them ($531 against a typical $587), it is bigger than 62% of them (2,100 ft² against a typical 1,724 ft²), its lot is bigger than 77% of them (0.26 ac against a typical 0.14 ac) and it is newer than 57% of them (1937 against a typical 1930). Measured against all of Middlesex County, it is worth more than 76% 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 666 Main St, Watertown, MA?

The 2025 property tax bill for 666 Main St, Watertown, MA was $9,936. The county assessed it at $850,700.

More homes on Main St

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