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Single Family ResidenceResidential
$757,002$321 / 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 Jul 14, 2026
Last sold for $450,000 on Jun 12, 2017

100 PROSPECT ST

ACTON, MA 01720
4
Beds
2
Baths
2,356 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.
1.01 ac
Lot SizeThe size of the land the home sits on, from county records.
1956
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$757K
$732K low$782K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$450,000 · Jun 12, 2017
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.$467,002
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$373,602
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.39%
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.$290,000
MIDDLESEX SAVINGS BANK · R · recorded Jan 8, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,518 (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.$671,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$260,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$411,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$917,320

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.41
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
16
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
60
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
95
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
33
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

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.1.01
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.In-Ground Pool

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.

M
R. J. Grey Junior High SchoolA
Middle · Grades 7–8 · 0.5 mi
E
Merriam Elementary SchoolB
Elementary · Grades KG–6 · 0.5 mi
H
Acton - Boxborough Regional High SchoolA
High · Grades 9–12 · 0.7 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

100 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.

  • Costs less per square foot than 94% of homes in Acton 01720
  • Bigger than 69% of homes in Middlesex County
  • Has a bigger lot than 81% of homes in Middlesex County
  • Older than 85% of 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
$230K$1.7M

This home is worth more than 36% 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$757,002
CheaperTypical $865,326Pricier

Pricier than 36% of homes nearby

Price per ft²$321
CheaperTypical $416Pricier

Pricier than 6% of homes nearby

Living area2,356 ft²
SmallerTypical 2,087 ft²Bigger

Bigger than 63% of homes nearby

Lot size1.01 ac
SmallerTypical 0.71 acBigger

Bigger than 63% of homes nearby

Year built1956
OlderTypical 1971Newer

Newer than 15% of homes nearby

How 100 Prospect St ranks against every home in each area.
MeasureThis homeActon 01720Middlesex County
Estimated valuepricier than$757,00236% of homes47% of homes
Price per ft²pricier than$3216% of homes12% of homes
Living areabigger than2,356 ft²63% of homes69% of homes
Lot sizebigger than1.01 ac63% of homes81% of homes
Year builtnewer than195615% of homes48% of homes

About 100 Prospect St

How much is 100 Prospect St, Acton, MA worth?

The TopHap Estimate for 100 Prospect St, Acton, MA is $757,002 as of Jul 14, 2026. The likely range is $732,372 to $781,632. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 100 Prospect St, Acton, MA last sell?

100 Prospect St, Acton, MA last sold on Jun 12, 2017 for $450,000, according to the county's recorded deed.

How big is 100 Prospect St, Acton, MA?

100 Prospect St, Acton, MA has 4 bedrooms, 2 bathrooms, 2,356 square feet of living space and a 1.01-acre lot.

When was 100 Prospect St, Acton, MA built?

100 Prospect St, Acton, MA was built in 1956, making it 70 years old. It is a ranch home. The building has 2 stories.

What schools serve 100 Prospect St, Acton, MA?

100 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 100 Prospect St, Acton, MA compare to other homes in Acton 01720?

Among the 7,508 homes in Acton 01720, it is worth more than 36% of them ($757,002 against a typical $865,326), its price per square foot is higher than 6% of them ($321 against a typical $416), it is bigger than 63% of them (2,356 ft² against a typical 2,087 ft²), its lot is bigger than 63% of them (1.01 ac against a typical 0.71 ac) and it is newer than 15% of them (1956 against a typical 1971). Measured against all of Middlesex County, it is worth more than 47% 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 100 Prospect St, Acton, MA?

The 2025 property tax bill for 100 Prospect St, Acton, MA was $11,518. The county assessed it at $671,600.

Closest homes

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Assigned schools

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