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Single Family ResidenceResidential
$971,470$312 / 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 96How 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 $889,050 on Sep 12, 2022

21 HARTSVILLE MILL RIVER RD

NEW MARLBORO, MA 01230
6
Beds
2
Baths
3,110 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 ac
Lot SizeThe size of the land the home sits on, from county records.
1850
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

$971K
$931K low$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.$889,050 · Sep 12, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,111 (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.$880,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$101,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$779,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$880,600

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.91 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%

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.Historical
CountyBerkshire
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.2003
Lot (acres)The size of the land the home sits on, from county records.1.00
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.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
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, Detached

Transaction History(2)

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
New Marlborough Central SchoolB+
Elementary · Grades PK–4 · 0.0 mi
M
Mt. Everett Regional SchoolB-
Middle · Grades 7–12 · 5.5 mi

District: Southern Berkshire School District

Neighborhood · ZIP 01230These 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.97
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.85
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.58

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.79%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.9%
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.8,376
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.84 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$79,357
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$113,887
Average tempThe average temperature here across a full year.45°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%

Owner Tools

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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

21 Hartsville Mill River 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 more than 91% of homes in Berkshire County
  • Costs less per square foot than 72% of homes in Great Barrington 01230
  • Bigger than 90% of homes in Berkshire County
  • Has a bigger lot than 66% of homes in Berkshire County
  • Older than 97% of homes in Berkshire County

What homes are worth in Great Barrington 01230

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

This home
$253K$2.5M

This home is worth more than 74% of homes in Great Barrington 01230.

How it measures up in Great Barrington 01230

The dot is this home. The mark in the middle is the typical home in Great Barrington 01230.

Estimated value$971,470
CheaperTypical $649,000Pricier

Pricier than 74% of homes nearby

Price per ft²$312
CheaperTypical $377Pricier

Pricier than 28% of homes nearby

Living area3,110 ft²
SmallerTypical 1,864 ft²Bigger

Bigger than 87% of homes nearby

Lot size1 ac
SmallerTypical 1.31 acBigger

Bigger than 43% of homes nearby

Year built1850
OlderTypical 1962Newer

Newer than 4% of homes nearby

How 21 Hartsville Mill River Rd ranks against every home in each area.
MeasureThis homeGreat Barrington 01230Berkshire County
Estimated valuepricier than$971,47074% of homes91% of homes
Price per ft²pricier than$31228% of homes72% of homes
Living areabigger than3,110 ft²87% of homes90% of homes
Lot sizebigger than1 ac43% of homes66% of homes
Year builtnewer than18504% of homes3% of homes

About 21 Hartsville Mill River Rd

How much is 21 Hartsville Mill River Rd, New Marlboro, MA worth?

The TopHap Estimate for 21 Hartsville Mill River Rd, New Marlboro, MA is $971,470 as of Aug 30, 2026. The likely range is $930,613 to $1,012,327. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Hartsville Mill River Rd, New Marlboro, MA last sell?

21 Hartsville Mill River Rd, New Marlboro, MA last sold on Sep 12, 2022 for $889,050, according to the county's recorded deed.

How big is 21 Hartsville Mill River Rd, New Marlboro, MA?

21 Hartsville Mill River Rd, New Marlboro, MA has 6 bedrooms, 2 bathrooms, 3,110 square feet of living space and a 1.00-acre lot.

When was 21 Hartsville Mill River Rd, New Marlboro, MA built?

21 Hartsville Mill River Rd, New Marlboro, MA was built in 1850, making it 176 years old. It is a historical home. The building has 2 stories.

What schools serve 21 Hartsville Mill River Rd, New Marlboro, MA?

21 Hartsville Mill River Rd, New Marlboro, MA is assigned to New Marlborough Central School (elementary), rated B+; Mt. Everett Regional School (middle), rated B-. All sit in Southern Berkshire School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Hartsville Mill River Rd, New Marlboro, MA compare to other homes in Great Barrington 01230?

Among the 4,687 homes in Great Barrington 01230, it is worth more than 74% of them ($971,470 against a typical $649,000), its price per square foot is higher than 28% of them ($312 against a typical $377), it is bigger than 87% of them (3,110 ft² against a typical 1,864 ft²), its lot is bigger than 43% of them (1 ac against a typical 1.31 ac) and it is newer than 4% of them (1850 against a typical 1962). Measured against all of Berkshire County, it is worth more than 91% 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 21 Hartsville Mill River Rd, New Marlboro, MA?

The 2025 property tax bill for 21 Hartsville Mill River Rd, New Marlboro, MA was $6,111. The county assessed it at $880,600.

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