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Single Family ResidenceResidential
$2,362,180$761 / 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 Aug 30, 2026
Last sold for $2,500,000 on Jun 28, 2021

646 SOUTH ST

CARLISLE, MA 01741
3
Beds
2.5
Baths
3,104 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.
2 ac
Lot SizeThe size of the land the home sits on, from county records.
1865
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.

Valuation

$2.4M
$2.3M low$2.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$2,500,000 · Jun 28, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$28,275 (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.$2,145,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$566,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,579,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$2,072,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,661,045

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.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
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
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.2.00
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.Wood Shingle
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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
Carlisle SchoolA
Elementary · Grades PK–8 · 2.1 mi
H
Concord Carlisle High SchoolA+
High · Grades 9–12 · 4.6 mi

District: Concord-Carlisle School District

Neighborhood · ZIP 01741These 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.105
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.81

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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.0%
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.5,231
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.338 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$224,253
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$263,753
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.46 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

646 South 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 Middlesex County
  • Among the highest price per square foot in Carlisle 01741
  • Bigger than 87% of homes in Middlesex County
  • Has a bigger lot than 89% of homes in Middlesex County
  • Older than 98% of homes in Middlesex County

What homes are worth in Carlisle 01741

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

This home
$795K$2.6M

This home is worth more than 95% of homes in Carlisle 01741.

How it measures up in Carlisle 01741

The dot is this home. The mark in the middle is the typical home in Carlisle 01741.

Estimated value$2,362,180
CheaperTypical $1,374,429Pricier

Pricier than 95% of homes nearby

Price per ft²$761
CheaperTypical $437Pricier

Pricier than almost all homes nearby

Living area3,104 ft²
SmallerTypical 3,138 ft²Bigger

Bigger than 49% of homes nearby

Lot size2 ac
SmallerTypical 2.15 acBigger

Bigger than 21% of homes nearby

Year built1865
OlderTypical 1979Newer

Newer than 4% of homes nearby

How 646 South St ranks against every home in each area.
MeasureThis homeCarlisle 01741Middlesex County
Estimated valuepricier than$2,362,18095% of homes97% of homes
Price per ft²pricier than$761almost all homes90% of homes
Living areabigger than3,104 ft²49% of homes87% of homes
Lot sizebigger than2 ac21% of homes89% of homes
Year builtnewer than18654% of homes2% of homes

About 646 South St

How much is 646 South St, Carlisle, MA worth?

The TopHap Estimate for 646 South St, Carlisle, MA is $2,362,180 as of Aug 30, 2026. The likely range is $2,287,040 to $2,437,320. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 646 South St, Carlisle, MA last sell?

646 South St, Carlisle, MA last sold on Jun 28, 2021 for $2,500,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 646 South St, Carlisle, MA?

646 South St, Carlisle, MA has 3 bedrooms, 2.5 bathrooms, 3,104 square feet of living space and a 2.00-acre lot.

When was 646 South St, Carlisle, MA built?

646 South St, Carlisle, MA was built in 1865, making it 161 years old. The building has 2 stories.

What schools serve 646 South St, Carlisle, MA?

646 South St, Carlisle, MA is assigned to Carlisle School (elementary), rated A; Concord Carlisle High School (high), rated A+. All sit in Concord-Carlisle School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 646 South St, Carlisle, MA compare to other homes in Carlisle 01741?

Among the 1,841 homes in Carlisle 01741, it is worth more than 95% of them ($2,362,180 against a typical $1,374,429), its price per square foot is higher than almost all of them ($761 against a typical $437), it is bigger than 49% of them (3,104 ft² against a typical 3,138 ft²), its lot is bigger than 21% of them (2 ac against a typical 2.15 ac) and it is newer than 4% of them (1865 against a typical 1979). Measured against all of Middlesex 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 646 South St, Carlisle, MA?

The 2025 property tax bill for 646 South St, Carlisle, MA was $28,275. The county assessed it at $2,145,300.

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