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Single Family ResidenceResidential
$1,298,977$670 / 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 93How 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 $534,000 on May 23, 2014

21 BAY ST

OSTERVILLE, MA 02655
3
Beds
2.5
Baths
1,940 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.
0.3 ac
Lot SizeThe size of the land the home sits on, from county records.
1754
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.3M
$1.2M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$534,000 · May 23, 2014

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,941 (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.$1,228,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$828,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$400,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,153,870

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.33
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
5
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
47
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
83
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
29
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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
StyleThe architectural style of the home, such as ranch or colonial.Cape Cod
CountyBARNSTABLE
Lot (acres)The size of the land the home sits on, from county records.0.30
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
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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
West Villages Elementary SchoolA
Elementary · Grades KG–3 · 2.4 mi
H
Barnstable High SchoolD
High · Grades 8–12 · 3.9 mi
M
Barnstable Intermediate SchoolC
Middle · Grades 6–7 · 4.1 mi

District: Barnstable School District

Neighborhood · ZIP 02655These 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.91
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 100.46

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.55%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.6%
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.3,622
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.443 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$114,803
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$158,292
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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

21 Bay 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 82% of homes in Barnstable County
  • Costs more per square foot than 77% of homes in Barnstable County
  • Bigger than 68% of homes in Barnstable County
  • Has a smaller lot than 86% of homes in Osterville 02655
  • Among the oldest homes in Osterville 02655

What homes are worth in Osterville 02655

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

This home
$412K$10M

This home is worth more than 56% of homes in Osterville 02655.

How it measures up in Osterville 02655

The dot is this home. The mark in the middle is the typical home in Osterville 02655.

Estimated value$1,298,977
CheaperTypical $1,109,018Pricier

Pricier than 56% of homes nearby

Price per ft²$670
CheaperTypical $581Pricier

Pricier than 60% of homes nearby

Living area1,940 ft²
SmallerTypical 1,940 ft²Bigger

Bigger than 50% of homes nearby

Lot size0.3 ac
SmallerTypical 0.48 acBigger

Bigger than 14% of homes nearby

Year built1754
OlderTypical 1979Newer

Older than almost all homes nearby

How 21 Bay St ranks against every home in each area.
MeasureThis homeOsterville 02655Barnstable County
Estimated valuepricier than$1,298,97756% of homes82% of homes
Price per ft²pricier than$67060% of homes77% of homes
Living areabigger than1,940 ft²50% of homes68% of homes
Lot sizebigger than0.3 ac14% of homes32% of homes
Year builtnewer than1754almost no homesalmost no homes

About 21 Bay St

How much is 21 Bay St, Osterville, MA worth?

The TopHap Estimate for 21 Bay St, Osterville, MA is $1,298,977 as of Sep 24, 2026. The likely range is $1,212,563 to $1,385,392. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Bay St, Osterville, MA last sell?

21 Bay St, Osterville, MA last sold on May 23, 2014 for $534,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Bay St, Osterville, MA?

21 Bay St, Osterville, MA has 3 bedrooms, 2.5 bathrooms, 1,940 square feet of living space and a 0.30-acre lot.

When was 21 Bay St, Osterville, MA built?

21 Bay St, Osterville, MA was built in 1754, making it 272 years old. It is a cape cod home. The building has 2 stories.

What schools serve 21 Bay St, Osterville, MA?

21 Bay St, Osterville, MA is assigned to West Villages Elementary School (elementary), rated A; Barnstable High School (high), rated D; Barnstable Intermediate School (middle), rated C. All sit in Barnstable School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Bay St, Osterville, MA compare to other homes in Osterville 02655?

Among the 2,684 homes in Osterville 02655, it is worth more than 56% of them ($1,298,977 against a typical $1,109,018), its price per square foot is higher than 60% of them ($670 against a typical $581), it is bigger than 50% of them (1,940 ft² against a typical 1,940 ft²), its lot is bigger than 14% of them (0.3 ac against a typical 0.48 ac) and it is newer than almost none of them (1754 against a typical 1979). Measured against all of Barnstable County, it is worth more than 82% 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 Bay St, Osterville, MA?

The 2025 property tax bill for 21 Bay St, Osterville, MA was $9,941. The county assessed it at $1,228,800.

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