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Single Family ResidenceResidential
$591,949$484 / 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 94How 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

21 ALTON ST

WALPOLE, MA 02081
3
Beds
2
Baths
1,222 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.
0.46 ac
Lot SizeThe size of the land the home sits on, from county records.
1965
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$592K
$554K low$630K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,738 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$621,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$353,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$268,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$591,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$618,868

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.Split Level
CountyNORFOLK
Lot (acres)The size of the land the home sits on, from county records.0.46
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(6)

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
Old Post RoadA+
Elementary · Grades KG–5 · 0.5 mi
H
Walpole High SchoolB+
High · Grades 9–12 · 1.1 mi

District: Walpole School District

Neighborhood · ZIP 02081These 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.27
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 100.64

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.2%
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.20,697
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,190 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$154,284
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$180,354
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.52%

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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 Alton 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 less than 77% of homes in Walpole 02081
  • Costs more per square foot than 82% of homes in Walpole 02081
  • Smaller than 85% of homes in Walpole 02081
  • Has a smaller lot than 65% of homes in Walpole 02081

What homes are worth in Walpole 02081

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

This home
$407K$1.8M

This home is worth more than 23% of homes in Walpole 02081.

How it measures up in Walpole 02081

The dot is this home. The mark in the middle is the typical home in Walpole 02081.

Estimated value$591,949
CheaperTypical $729,063Pricier

Pricier than 23% of homes nearby

Price per ft²$484
CheaperTypical $410Pricier

Pricier than 82% of homes nearby

Living area1,222 ft²
SmallerTypical 1,792 ft²Bigger

Bigger than 15% of homes nearby

Lot size0.46 ac
SmallerTypical 0.61 acBigger

Bigger than 35% of homes nearby

Year built1965
OlderTypical 1974Newer

Newer than 44% of homes nearby

How 21 Alton St ranks against every home in each area.
MeasureThis homeWalpole 02081Norfolk County
Estimated valuepricier than$591,94923% of homes29% of homes
Price per ft²pricier than$48482% of homes61% of homes
Living areabigger than1,222 ft²15% of homes23% of homes
Lot sizebigger than0.46 ac35% of homes59% of homes
Year builtnewer than196544% of homes59% of homes

About 21 Alton St

How much is 21 Alton St, Walpole, MA worth?

The TopHap Estimate for 21 Alton St, Walpole, MA is $591,949 as of Sep 24, 2026. The likely range is $553,552 to $630,346. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Alton St, Walpole, MA last sell?

21 Alton St, Walpole, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Alton St, Walpole, MA?

21 Alton St, Walpole, MA has 3 bedrooms, 2 bathrooms, 1,222 square feet of living space and a 0.46-acre lot.

When was 21 Alton St, Walpole, MA built?

21 Alton St, Walpole, MA was built in 1965, making it 61 years old. It is a split level home. The building has 1 story.

What schools serve 21 Alton St, Walpole, MA?

21 Alton St, Walpole, MA is assigned to Old Post Road (elementary), rated A+; Walpole High School (high), rated B+. All sit in Walpole School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Alton St, Walpole, MA compare to other homes in Walpole 02081?

Among the 6,504 homes in Walpole 02081, it is worth more than 23% of them ($591,949 against a typical $729,063), its price per square foot is higher than 82% of them ($484 against a typical $410), it is bigger than 15% of them (1,222 ft² against a typical 1,792 ft²), its lot is bigger than 35% of them (0.46 ac against a typical 0.61 ac) and it is newer than 44% of them (1965 against a typical 1974). Measured against all of Norfolk County, it is worth more than 29% 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 Alton St, Walpole, MA?

The 2026 property tax bill for 21 Alton St, Walpole, MA was $7,738. The county assessed it at $621,500.

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