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CondominiumResidential
$440,760$383 / 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 Sep 24, 2026
Last sold for $230,000 on Jun 1, 2015

21 KEY ST

MILLIS, MA 02054
2
Beds
1.5
Baths
1,152 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.
9.12 ac
Lot SizeThe size of the land the home sits on, from county records.
1984
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$441K
$425K low$456K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$230,000 · Jun 1, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,922 (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.$361,100 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$361,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$393,300

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.17 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyNORFOLK
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Baseboard
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(10)

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
Clyde F BrownB
Elementary · Grades PK–5 · 1.0 mi
M
Millis Middle SchoolB+
Middle · Grades 6–8 · 1.1 mi
H
Millis High SchoolA-
High · Grades 9–12 · 1.1 mi

District: Millis School District

Neighborhood · ZIP 02054These 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.66
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.61

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.4.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.8,559
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.711 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$129,499
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$145,526
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 Key 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 91% of homes in Norfolk County
  • Costs less per square foot than 71% of homes in Norfolk County
  • Smaller than 82% of homes in Millis 02054
  • Has a bigger lot than 97% of homes in Norfolk County
  • Newer than 74% of homes in Norfolk County

What homes are worth in Millis 02054

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

This home
$363K$1.3M

This home is worth more than 10% of homes in Millis 02054.

How it measures up in Millis 02054

The dot is this home. The mark in the middle is the typical home in Millis 02054.

Estimated value$440,760
CheaperTypical $675,755Pricier

Pricier than 10% of homes nearby

Price per ft²$383
CheaperTypical $381Pricier

Pricier than 51% of homes nearby

Living area1,152 ft²
SmallerTypical 1,830 ft²Bigger

Bigger than 18% of homes nearby

Lot size9.12 ac
SmallerTypical 0.79 acBigger

Bigger than 88% of homes nearby

Year built1984
OlderTypical 1977Newer

Newer than 60% of homes nearby

How 21 Key St ranks against every home in each area.
MeasureThis homeMillis 02054Norfolk County
Estimated valuepricier than$440,76010% of homes9% of homes
Price per ft²pricier than$38351% of homes29% of homes
Living areabigger than1,152 ft²18% of homes19% of homes
Lot sizebigger than9.12 ac88% of homes97% of homes
Year builtnewer than198460% of homes74% of homes

About 21 Key St

How much is 21 Key St, Millis, MA worth?

The TopHap Estimate for 21 Key St, Millis, MA is $440,760 as of Sep 24, 2026. The likely range is $425,042 to $456,478. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Key St, Millis, MA last sell?

21 Key St, Millis, MA last sold on Jun 1, 2015 for $230,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 21 Key St, Millis, MA?

21 Key St, Millis, MA has 2 bedrooms, 1.5 bathrooms and 1,152 square feet of living space.

When was 21 Key St, Millis, MA built?

21 Key St, Millis, MA was built in 1984, making it 42 years old. It is a condo/apartment home. The building has 2 stories.

What schools serve 21 Key St, Millis, MA?

21 Key St, Millis, MA is assigned to Clyde F Brown (elementary), rated B; Millis Middle School (middle), rated B+; Millis High School (high), rated A-. All sit in Millis School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Key St, Millis, MA compare to other homes in Millis 02054?

Among the 3,217 homes in Millis 02054, it is worth more than 10% of them ($440,760 against a typical $675,755), its price per square foot is higher than 51% of them ($383 against a typical $381), it is bigger than 18% of them (1,152 ft² against a typical 1,830 ft²), its lot is bigger than 88% of them (9.12 ac against a typical 0.79 ac) and it is newer than 60% of them (1984 against a typical 1977). Measured against all of Norfolk County, it is worth more than 9% 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 Key St, Millis, MA?

The 2025 property tax bill for 21 Key St, Millis, MA was $5,922. The county assessed it at $361,100.

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