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Duplex (2 Units, Any Combination)Residential

66 UNION ST

CHELSEA, MA 02150
4
Beds
2
Baths
2,728 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.
4,275 ft²
Lot SizeThe size of the land the home sits on, from county records.
1920
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
4
ParkingThe number of parking spaces on the property, including the garage.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,271 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$720,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$218,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$502,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$706,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$753,596

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.10
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
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(1)

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.

H
Chelsea High SchoolD-
High · Grades 9–12 · 0.3 mi
M
Clark Avenue SchoolF
Middle · Grades 5–8 · 0.7 mi
E
William a Berkowitz Elementary SchoolC+
Elementary · Grades 1–4 · 1.1 mi

District: Chelsea School District

Neighborhood · ZIP 02150These 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.89
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.76

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.17%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.16%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.40,106
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.16,087 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$72,192
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$94,537
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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

66 Union 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 81% of homes in Suffolk County
  • Has a bigger lot than 67% of homes in Suffolk County

How it measures up in Chelsea 02150

The dot is this home. The mark in the middle is the typical home in Chelsea 02150.

Living area2,728 ft²
SmallerTypical 1,726 ft²Bigger

Bigger than 73% of homes nearby

Lot size4,275 ft²
SmallerTypical 3,703 ft²Bigger

Bigger than 61% of homes nearby

Year built1920
OlderTypical 1920Newer

Newer than 59% of homes nearby

How 66 Union St ranks against every home in each area.
MeasureThis homeChelsea 02150Suffolk County
Living areabigger than2,728 ft²73% of homes81% of homes
Lot sizebigger than4,275 ft²61% of homes67% of homes
Year builtnewer than192059% of homes55% of homes

About 66 Union St

When did 66 Union St, Chelsea, MA last sell?

66 Union St, Chelsea, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 66 Union St, Chelsea, MA?

66 Union St, Chelsea, MA has 4 bedrooms, 2 bathrooms, 2,728 square feet of living space and a 0.10-acre lot.

When was 66 Union St, Chelsea, MA built?

66 Union St, Chelsea, MA was built in 1920, making it 106 years old. It is a duplex single home. The building has 2 stories.

What schools serve 66 Union St, Chelsea, MA?

66 Union St, Chelsea, MA is assigned to Chelsea High School (high), rated D-; Clark Avenue School (middle), rated F; William a Berkowitz Elementary School (elementary), rated C+. All sit in Chelsea School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 66 Union St, Chelsea, MA compare to other homes in Chelsea 02150?

Among the 5,340 homes in Chelsea 02150, it is bigger than 73% of them (2,728 ft² against a typical 1,726 ft²), its lot is bigger than 61% of them (4,275 ft² against a typical 3,703 ft²) and it is newer than 59% of them (1920 against a typical 1920). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 66 Union St, Chelsea, MA?

The 2026 property tax bill for 66 Union St, Chelsea, MA was $8,271. The county assessed it at $720,500.

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