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Apartments (Generic)Residential

51 UNION ST

MARLBOROUGH, MA 01752
7
Beds
6
Baths
4,733 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.
1 ac
Lot SizeThe size of the land the home sits on, from county records.
1823
Year BuiltThe year the home was originally built, according to county records.
3
StoriesHow many floors the home has above ground.
21
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,411 (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.$954,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$226,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$728,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$888,400

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Apartments (Generic)
StyleThe architectural style of the home, such as ranch or colonial.Two Family
CountyMiddlesex
Lot (acres)The size of the land the home sits on, from county records.1.00
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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
1LT Charles W. Whitcomb SchoolB-
Middle · Grades 6–8 · 0.1 mi
H
Marlborough High SchoolC-
High · Grades 9–12 · 0.6 mi
E
Sgt. Charles J. Jaworek Elementary SchoolC+
Elementary · Grades KG–5 · 1.1 mi

District: Marlborough School District

Neighborhood · ZIP 01752These 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.100
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.65

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.26%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.1%
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.42,223
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,953 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,959
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$112,206
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.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

51 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.

  • Among the largest homes in Marlborough 01752
  • Has a bigger lot than 79% of homes in Middlesex County
  • Among the oldest homes in Marlborough 01752

How it measures up in Marlborough 01752

The dot is this home. The mark in the middle is the typical home in Marlborough 01752.

Living area4,733 ft²
SmallerTypical 1,591 ft²Bigger

Bigger than almost all homes nearby

Lot size1 ac
SmallerTypical 0.47 acBigger

Bigger than 71% of homes nearby

Year built1823
OlderTypical 1967Newer

Older than almost all homes nearby

How 51 Union St ranks against every home in each area.
MeasureThis homeMarlborough 01752Middlesex County
Living areabigger than4,733 ft²almost all homes98% of homes
Lot sizebigger than1 ac71% of homes79% of homes
Year builtnewer than1823almost no homesalmost no homes

About 51 Union St

When did 51 Union St, Marlborough, MA last sell?

51 Union St, Marlborough, MA last sold on Jul 8, 1999, according to the county's recorded deed.

How big is 51 Union St, Marlborough, MA?

51 Union St, Marlborough, MA has 7 bedrooms, 6 bathrooms, 4,733 square feet of living space and a 1.00-acre lot.

When was 51 Union St, Marlborough, MA built?

51 Union St, Marlborough, MA was built in 1823, making it 203 years old. It is a two family home. The building has 3 stories.

What schools serve 51 Union St, Marlborough, MA?

51 Union St, Marlborough, MA is assigned to 1LT Charles W. Whitcomb School (middle), rated B-; Marlborough High School (high), rated C-; Sgt. Charles J. Jaworek Elementary School (elementary), rated C+. All sit in Marlborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 51 Union St, Marlborough, MA compare to other homes in Marlborough 01752?

Among the 10,751 homes in Marlborough 01752, it is bigger than almost all of them (4,733 ft² against a typical 1,591 ft²), its lot is bigger than 71% of them (1 ac against a typical 0.47 ac) and it is newer than almost none of them (1823 against a typical 1967). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 51 Union St, Marlborough, MA?

The 2025 property tax bill for 51 Union St, Marlborough, MA was $9,411. The county assessed it at $954,500.

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