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Single Family ResidenceResidential
$1,088,641$231 / 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 Jul 14, 2026
Last sold for $960,000 on Apr 14, 2022

138 PROSPECT ST

ACTON, MA 01720
4
Beds
2
Baths
4,703 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.
0.95 ac
Lot SizeThe size of the land the home sits on, from county records.
1735
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
12
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.1M
$1M low$1.1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$960,000 · Apr 14, 2022
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$638,641
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$510,913
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.43%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$450,000
MIDDLESEX SAVINGS BANK · P · 2.5% 1 · recorded Apr 14, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,986 (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.$932,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$287,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$644,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,152,350

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.Historical
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.95
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(12)

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
R. J. Grey Junior High SchoolA
Middle · Grades 7–8 · 0.3 mi
E
Merriam Elementary SchoolB
Elementary · Grades KG–6 · 0.4 mi
H
Acton - Boxborough Regional High SchoolA
High · Grades 9–12 · 0.5 mi

District: Acton-Boxborough School District

Neighborhood · ZIP 01720These 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.71
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.72

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.24,473
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,210 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$148,952
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$187,397
Average tempThe average temperature here across a full year.48°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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

138 Prospect 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 more than 75% of homes in Acton 01720
  • Among the lowest price per square foot in Acton 01720
  • Among the largest homes in Acton 01720
  • Has a bigger lot than 78% of homes in Middlesex County
  • Among the oldest homes in Acton 01720

What homes are worth in Acton 01720

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

This home
$225K$1.7M

This home is worth more than 75% of homes in Acton 01720.

How it measures up in Acton 01720

The dot is this home. The mark in the middle is the typical home in Acton 01720.

Estimated value$1,088,641
CheaperTypical $862,773Pricier

Pricier than 75% of homes nearby

Price per ft²$231
CheaperTypical $417Pricier

Cheaper than almost all homes nearby

Living area4,703 ft²
SmallerTypical 2,090 ft²Bigger

Bigger than almost all homes nearby

Lot size0.95 ac
SmallerTypical 0.7 acBigger

Bigger than 61% of homes nearby

Year built1735
OlderTypical 1971Newer

Older than almost all homes nearby

How 138 Prospect St ranks against every home in each area.
MeasureThis homeActon 01720Middlesex County
Estimated valuepricier than$1,088,64175% of homes75% of homes
Price per ft²pricier than$231almost no homes2% of homes
Living areabigger than4,703 ft²almost all homes98% of homes
Lot sizebigger than0.95 ac61% of homes78% of homes
Year builtnewer than1735almost no homesalmost no homes

About 138 Prospect St

How much is 138 Prospect St, Acton, MA worth?

The TopHap Estimate for 138 Prospect St, Acton, MA is $1,088,641 as of Jul 14, 2026. The likely range is $1,033,937 to $1,143,345. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 138 Prospect St, Acton, MA last sell?

138 Prospect St, Acton, MA last sold on Apr 14, 2022 for $960,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 138 Prospect St, Acton, MA?

138 Prospect St, Acton, MA has 4 bedrooms, 2 bathrooms, 4,703 square feet of living space and a 0.95-acre lot.

When was 138 Prospect St, Acton, MA built?

138 Prospect St, Acton, MA was built in 1735, making it 291 years old. It is a historical home. The building has 2 stories.

What schools serve 138 Prospect St, Acton, MA?

138 Prospect St, Acton, MA is assigned to R. J. Grey Junior High School (middle), rated A; Merriam Elementary School (elementary), rated B; Acton - Boxborough Regional High School (high), rated A. All sit in Acton-Boxborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 138 Prospect St, Acton, MA compare to other homes in Acton 01720?

Among the 7,508 homes in Acton 01720, it is worth more than 75% of them ($1,088,641 against a typical $862,773), its price per square foot is higher than almost none of them ($231 against a typical $417), it is bigger than almost all of them (4,703 ft² against a typical 2,090 ft²), its lot is bigger than 61% of them (0.95 ac against a typical 0.7 ac) and it is newer than almost none of them (1735 against a typical 1971). Measured against all of Middlesex County, it is worth more than 75% 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 138 Prospect St, Acton, MA?

The 2025 property tax bill for 138 Prospect St, Acton, MA was $15,986. The county assessed it at $932,100.

Closest homes

More homes in Acton 01720

Assigned schools

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