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Single Family ResidenceResidential
$472,361$383 / 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 Sep 24, 2026

20 PORTER RD

MARLBOROUGH, MA 01752
2
Beds
1.5
Baths
1,233 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1957
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$472K
$459K low$485K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,094 (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.$415,200 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$220,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$195,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$528,010

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
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1970
Lot (acres)The size of the land the home sits on, from county records.0.23
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.Hot Water
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
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.

E
Sgt. Charles J. Jaworek Elementary SchoolD+
Elementary · Grades KG–5 · 0.3 mi
H
Marlborough High SchoolD+
High · Grades 9–12 · 0.5 mi
M
1LT Charles W. Whitcomb SchoolD
Middle · Grades 6–8 · 0.8 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

20 Porter Rd 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 87% of homes in Middlesex County
  • Costs more per square foot than 74% of homes in Marlborough 01752
  • Smaller than 79% of homes in Middlesex County
  • Has a smaller lot than 81% of homes in Marlborough 01752
  • Older than 70% 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
$198K$1M

This home is worth more than 36% 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$472,361
CheaperTypical $528,559Pricier

Pricier than 36% of homes nearby

Price per ft²$383
CheaperTypical $335Pricier

Pricier than 74% of homes nearby

Living area1,233 ft²
SmallerTypical 1,593 ft²Bigger

Bigger than 28% of homes nearby

Lot size0.23 ac
SmallerTypical 0.46 acBigger

Bigger than 19% of homes nearby

Year built1957
OlderTypical 1967Newer

Newer than 30% of homes nearby

How 20 Porter Rd ranks against every home in each area.
MeasureThis homeMarlborough 01752Middlesex County
Estimated valuepricier than$472,36136% of homes13% of homes
Price per ft²pricier than$38374% of homes28% of homes
Living areabigger than1,233 ft²28% of homes21% of homes
Lot sizebigger than0.23 ac19% of homes38% of homes
Year builtnewer than195730% of homes49% of homes

About 20 Porter Rd

How much is 20 Porter Rd, Marlborough, MA worth?

The TopHap Estimate for 20 Porter Rd, Marlborough, MA is $472,361 as of Sep 24, 2026. The likely range is $459,258 to $485,464. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Porter Rd, Marlborough, MA last sell?

20 Porter Rd, Marlborough, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 20 Porter Rd, Marlborough, MA?

20 Porter Rd, Marlborough, MA has 2 bedrooms, 1.5 bathrooms, 1,233 square feet of living space and a 0.23-acre lot.

When was 20 Porter Rd, Marlborough, MA built?

20 Porter Rd, Marlborough, MA was built in 1957, making it 69 years old. It is a ranch home. The building has 1 story.

What schools serve 20 Porter Rd, Marlborough, MA?

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

How does 20 Porter Rd, Marlborough, MA compare to other homes in Marlborough 01752?

Among the 10,751 homes in Marlborough 01752, it is worth more than 36% of them ($472,361 against a typical $528,559), its price per square foot is higher than 74% of them ($383 against a typical $335), it is bigger than 28% of them (1,233 ft² against a typical 1,593 ft²), its lot is bigger than 19% of them (0.23 ac against a typical 0.46 ac) and it is newer than 30% of them (1957 against a typical 1967). Measured against all of Middlesex County, it is worth more than 13% 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 20 Porter Rd, Marlborough, MA?

The 2025 property tax bill for 20 Porter Rd, Marlborough, MA was $4,094. The county assessed it at $415,200.

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