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Duplex (2 Units, Any Combination)Residential
Last sold for $245,000 on Nov 19, 2014

21 OLNEY ST

WATERTOWN, MA 02472
6
Beds
2
Baths
2,002 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.
4,000 ft²
Lot SizeThe size of the land the home sits on, from county records.
1910
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
11
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$245,000 · Nov 19, 2014

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,386 (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.$889,200 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$509,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$379,800

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.09
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.Slate
HeatingThe type of heating system in the home.Steam
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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
Watertown Middle SchoolB-
Middle · Grades 6–8 · 0.2 mi
E
Cunniff Elementary SchoolA
Elementary · Grades KG–5 · 0.4 mi
H
Watertown High SchoolB-
High · Grades 9–12 · 0.9 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

21 Olney 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 66% of homes in Watertown West End
  • Has a smaller lot than 94% of homes in Watertown West End
  • Older than 87% of homes in Watertown West End

How it measures up in Watertown 02472

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

Living area2,002 ft²
SmallerTypical 1,731 ft²Bigger

Bigger than 59% of homes nearby

Lot size4,000 ft²
SmallerTypical 0.14 acBigger

Bigger than 6% of homes nearby

Year built1910
OlderTypical 1930Newer

Newer than 21% of homes nearby

How 21 Olney St ranks against every home in each area.
MeasureThis homeWatertown West EndWatertown 02472Middlesex County
Living areabigger than2,002 ft²66% of homes59% of homes57% of homes
Lot sizebigger than4,000 ft²6% of homes6% of homes9% of homes
Year builtnewer than191013% of homes21% of homes19% of homes

About 21 Olney St

When did 21 Olney St, Watertown, MA last sell?

21 Olney St, Watertown, MA last sold on Nov 19, 2014 for $245,000, according to the county's recorded deed.

How big is 21 Olney St, Watertown, MA?

21 Olney St, Watertown, MA has 6 bedrooms, 2 bathrooms, 2,002 square feet of living space and a 0.09-acre lot.

When was 21 Olney St, Watertown, MA built?

21 Olney St, Watertown, MA was built in 1910, making it 116 years old. The building has 2 stories.

What schools serve 21 Olney St, Watertown, MA?

21 Olney St, Watertown, MA is assigned to Watertown Middle School (middle), rated B-; Cunniff Elementary School (elementary), rated A; 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 21 Olney St, Watertown, MA compare to other homes in Watertown 02472?

Among the 10,041 homes in Watertown 02472, it is bigger than 59% of them (2,002 ft² against a typical 1,731 ft²), its lot is bigger than 6% of them (4,000 ft² against a typical 0.14 ac) and it is newer than 21% of them (1910 against a typical 1930). 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 Olney St, Watertown, MA?

The 2025 property tax bill for 21 Olney St, Watertown, MA was $10,386. The county assessed it at $889,200.

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