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Single Family ResidenceResidential
$1,288,436$320 / 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 76How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $379,900 on Jul 16, 2010

517 MAIN ST

DENNIS, MA 02638
4
Beds
3.5
Baths
4,024 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.
0.9 ac
Lot SizeThe size of the land the home sits on, from county records.
1923
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.3M
$984K low$1.6M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$379,900 · Jul 16, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,386 (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.$1,243,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$232,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,011,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$989,710

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.
3
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
50
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
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.2002
Lot (acres)The size of the land the home sits on, from county records.0.90
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.Hot Water
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, Basement
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

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.

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Ezra H. Baker Innovation SchoolB-
Elementary · Grades PK–3 · 1.6 mi
H
Dennis Yarmouth Regional High SchoolD+
High · Grades 9–12 · 2.1 mi
M
Mattacheese Middle SchoolC-
Middle · Grades 6–8 · 4.6 mi

District: Dennis-Yarmouth School District

Neighborhood · ZIP 02638These 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.106
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 100.48

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.53%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.4%
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.3,396
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.480 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$106,812
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$121,835
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

517 Main 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 81% of homes in Barnstable County
  • Among the lowest price per square foot in Dennis 02638
  • Bigger than 97% of homes in Dennis 02638
  • Has a bigger lot than 86% of homes in Dennis 02638
  • Older than 96% of homes in Dennis 02638

What homes are worth in Dennis 02638

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

This home
$362K$3.4M

This home is worth more than 69% of homes in Dennis 02638.

How it measures up in Dennis 02638

The dot is this home. The mark in the middle is the typical home in Dennis 02638.

Estimated value$1,288,436
CheaperTypical $953,723Pricier

Pricier than 69% of homes nearby

Price per ft²$320
CheaperTypical $580Pricier

Cheaper than almost all homes nearby

Living area4,024 ft²
SmallerTypical 1,662 ft²Bigger

Bigger than 97% of homes nearby

Lot size0.9 ac
SmallerTypical 0.43 acBigger

Bigger than 86% of homes nearby

Year built1923
OlderTypical 1976Newer

Newer than 4% of homes nearby

How 517 Main St ranks against every home in each area.
MeasureThis homeDennis 02638Barnstable County
Estimated valuepricier than$1,288,43669% of homes81% of homes
Price per ft²pricier than$320almost no homes6% of homes
Living areabigger than4,024 ft²97% of homes97% of homes
Lot sizebigger than0.9 ac86% of homes81% of homes
Year builtnewer than19234% of homes6% of homes

About 517 Main St

How much is 517 Main St, Dennis, MA worth?

The TopHap Estimate for 517 Main St, Dennis, MA is $1,288,436 as of Oct 21, 2026. The likely range is $984,274 to $1,592,598. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 517 Main St, Dennis, MA last sell?

517 Main St, Dennis, MA last sold on Jul 16, 2010 for $379,900, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 517 Main St, Dennis, MA?

517 Main St, Dennis, MA has 4 bedrooms, 3.5 bathrooms, 4,024 square feet of living space and a 0.90-acre lot.

When was 517 Main St, Dennis, MA built?

517 Main St, Dennis, MA was built in 1923, making it 103 years old. It is a cape cod home. The building has 2 stories.

What schools serve 517 Main St, Dennis, MA?

517 Main St, Dennis, MA is assigned to Ezra H. Baker Innovation School (elementary), rated B-; Dennis Yarmouth Regional High School (high), rated D+; Mattacheese Middle School (middle), rated C-. All sit in Dennis-Yarmouth School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 517 Main St, Dennis, MA compare to other homes in Dennis 02638?

Among the 3,456 homes in Dennis 02638, it is worth more than 69% of them ($1,288,436 against a typical $953,723), its price per square foot is higher than almost none of them ($320 against a typical $580), it is bigger than 97% of them (4,024 ft² against a typical 1,662 ft²), its lot is bigger than 86% of them (0.9 ac against a typical 0.43 ac) and it is newer than 4% of them (1923 against a typical 1976). Measured against all of Barnstable County, it is worth more than 81% 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 517 Main St, Dennis, MA?

The 2025 property tax bill for 517 Main St, Dennis, MA was $5,386. The county assessed it at $1,243,800.

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