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Single Family ResidenceResidential
$595,567$382 / 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 95How 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
Last sold for $340,000 on Feb 1, 2019

15 UNION ST

MARLBOROUGH, MA 01752
4
Beds
2.5
Baths
1,558 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.
0.29 ac
Lot SizeThe size of the land the home sits on, from county records.
1954
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$596K
$567K low$624K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$340,000 · Feb 1, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,836 (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.$490,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$212,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$278,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$461,890

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.Ranch
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.29
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
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(3)

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 · 1.0 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

15 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.

  • Worth less than 75% of homes in Middlesex County
  • Costs more per square foot than 73% of homes in Marlborough 01752
  • Has a smaller lot than 67% of homes in Marlborough 01752
  • Older than 72% of homes in Marlborough 01752

What homes are worth in Marlborough 01752

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

This home
$197K$1.1M

This home is worth more than 65% of 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.

Estimated value$595,567
CheaperTypical $525,365Pricier

Pricier than 65% of homes nearby

Price per ft²$382
CheaperTypical $337Pricier

Pricier than 73% of homes nearby

Living area1,558 ft²
SmallerTypical 1,589 ft²Bigger

Bigger than 49% of homes nearby

Lot size0.29 ac
SmallerTypical 0.46 acBigger

Bigger than 33% of homes nearby

Year built1954
OlderTypical 1967Newer

Newer than 28% of homes nearby

How 15 Union St ranks against every home in each area.
MeasureThis homeMarlborough 01752Middlesex County
Estimated valuepricier than$595,56765% of homes25% of homes
Price per ft²pricier than$38273% of homes28% of homes
Living areabigger than1,558 ft²49% of homes37% of homes
Lot sizebigger than0.29 ac33% of homes48% of homes
Year builtnewer than195428% of homes45% of homes

About 15 Union St

How much is 15 Union St, Marlborough, MA worth?

The TopHap Estimate for 15 Union St, Marlborough, MA is $595,567 as of Aug 30, 2026. The likely range is $566,968 to $624,166. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 15 Union St, Marlborough, MA last sell?

15 Union St, Marlborough, MA last sold on Feb 1, 2019 for $340,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 15 Union St, Marlborough, MA?

15 Union St, Marlborough, MA has 4 bedrooms, 2.5 bathrooms, 1,558 square feet of living space and a 0.29-acre lot.

When was 15 Union St, Marlborough, MA built?

15 Union St, Marlborough, MA was built in 1954, making it 72 years old. It is a ranch home. The building has 1 story.

What schools serve 15 Union St, Marlborough, MA?

15 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 15 Union St, Marlborough, MA compare to other homes in Marlborough 01752?

Among the 10,751 homes in Marlborough 01752, it is worth more than 65% of them ($595,567 against a typical $525,365), its price per square foot is higher than 73% of them ($382 against a typical $337), it is bigger than 49% of them (1,558 ft² against a typical 1,589 ft²), its lot is bigger than 33% of them (0.29 ac against a typical 0.46 ac) and it is newer than 28% of them (1954 against a typical 1967). Measured against all of Middlesex County, it is worth more than 25% 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 15 Union St, Marlborough, MA?

The 2025 property tax bill for 15 Union St, Marlborough, MA was $4,836. The county assessed it at $490,500.

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