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Single Family ResidenceResidential
$1,071,519$268 / 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 Sep 24, 2026

51 BLACKSTONE ST

MENDON, MA 01756
5
Beds
3.5
Baths
3,991 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.
11.55 ac
Lot SizeThe size of the land the home sits on, from county records.
2005
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.1M
$1M low$1.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,723 (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.$875,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$194,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$681,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$913,710

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.52
45
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
21
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
59
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
92
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
44
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.11 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%

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.Colonial
CountyWORCESTER
Lot (acres)The size of the land the home sits on, from county records.11.55
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
CoolingThe type of cooling or air conditioning in the home.Yes
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.

E
Henry P. Clough Elementary SchoolC+
Elementary · Grades PK–4 · 1.0 mi
M
Miscoe Hill Middle SchoolB
Middle · Grades 5–8 · 2.6 mi
H
Nipmuc Regional High SchoolB-
High · Grades 9–12 · 5.5 mi

District: Mendon-Upton School District

Neighborhood · ZIP 01756These 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.36
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.99
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.64

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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.6,409
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.357 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$128,573
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$169,057
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.50%

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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 Blackstone 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 97% of homes in Worcester County
  • Costs less per square foot than 88% of homes in Mendon 01756
  • Bigger than 97% of homes in Worcester County
  • Has a bigger lot than 97% of homes in Mendon 01756
  • Newer than 91% of homes in Worcester County

What homes are worth in Mendon 01756

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

This home
$349K$1.2M

This home is worth more than 95% of homes in Mendon 01756.

How it measures up in Mendon 01756

The dot is this home. The mark in the middle is the typical home in Mendon 01756.

Estimated value$1,071,519
CheaperTypical $711,586Pricier

Pricier than 95% of homes nearby

Price per ft²$268
CheaperTypical $327Pricier

Pricier than 12% of homes nearby

Living area3,991 ft²
SmallerTypical 2,232 ft²Bigger

Bigger than 96% of homes nearby

Lot size11.55 ac
SmallerTypical 1.4 acBigger

Bigger than 97% of homes nearby

Year built2005
OlderTypical 1987Newer

Newer than 86% of homes nearby

How 51 Blackstone St ranks against every home in each area.
MeasureThis homeMendon 01756Worcester County
Estimated valuepricier than$1,071,51995% of homes97% of homes
Price per ft²pricier than$26812% of homes28% of homes
Living areabigger than3,991 ft²96% of homes97% of homes
Lot sizebigger than11.55 ac97% of homes96% of homes
Year builtnewer than200586% of homes91% of homes

About 51 Blackstone St

How much is 51 Blackstone St, Mendon, MA worth?

The TopHap Estimate for 51 Blackstone St, Mendon, MA is $1,071,519 as of Sep 24, 2026. The likely range is $1,013,270 to $1,129,768. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 51 Blackstone St, Mendon, MA last sell?

51 Blackstone St, Mendon, MA last sold on Jan 24, 2005, according to the county's recorded deed.

How big is 51 Blackstone St, Mendon, MA?

51 Blackstone St, Mendon, MA has 5 bedrooms, 3.5 bathrooms, 3,991 square feet of living space and a 11.55-acre lot.

When was 51 Blackstone St, Mendon, MA built?

51 Blackstone St, Mendon, MA was built in 2005, making it 21 years old. It is a colonial home. The building has 2 stories.

What schools serve 51 Blackstone St, Mendon, MA?

51 Blackstone St, Mendon, MA is assigned to Henry P. Clough Elementary School (elementary), rated C+; Miscoe Hill Middle School (middle), rated B; Nipmuc Regional High School (high), rated B-. All sit in Mendon-Upton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 51 Blackstone St, Mendon, MA compare to other homes in Mendon 01756?

Among the 2,161 homes in Mendon 01756, it is worth more than 95% of them ($1,071,519 against a typical $711,586), its price per square foot is higher than 12% of them ($268 against a typical $327), it is bigger than 96% of them (3,991 ft² against a typical 2,232 ft²), its lot is bigger than 97% of them (11.55 ac against a typical 1.4 ac) and it is newer than 86% of them (2005 against a typical 1987). Measured against all of Worcester County, it is worth more than 97% 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 51 Blackstone St, Mendon, MA?

The 2025 property tax bill for 51 Blackstone St, Mendon, MA was $11,723. The county assessed it at $875,500.

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