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Single Family ResidenceResidential
$796,139$297 / 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 Aug 30, 2026
Last sold for $451,000 on Mar 17, 2017

15 PROSPECT ST

SMITHTOWN, NY 11787
3
Beds
1
Baths
2,682 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.
1 ac
Lot SizeThe size of the land the home sits on, from county records.
1887
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
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

$796K
$742K low$850K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$451,000 · Mar 17, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,471 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$4,380 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$550
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$3,830
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$547,500

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.Colonial
CountySUFFOLK
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.No Foundation
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Central
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, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
ViewThe type of view from the property, or another feature of the site that affects value.Suburban
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Shed · 80 ft²Porch · 168 ft²

Transaction History(2)

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
Smithtown Elementary SchoolB
Elementary · Grades KG–5 · 0.5 mi
M
Accompsett Middle SchoolC+
Middle · Grades 6–8 · 2.1 mi
H
Smithtown High School WestA
High · Grades 9–12 · 2.3 mi

District: Smithtown Central School District

Neighborhood · ZIP 11787These 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.44
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.69

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.2%
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.34,997
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,227 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$138,428
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$168,182
Average tempThe average temperature here across a full year.52°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.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

15 Prospect 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 65% of homes in Suffolk County
  • Costs less per square foot than 98% of homes in Smithtown
  • Bigger than 88% of homes in Suffolk County
  • Has a bigger lot than 94% of homes in Smithtown 11787
  • Among the oldest homes in Smithtown

What homes are worth in Smithtown 11787

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

This home
$527K$1.6M

This home is worth more than 51% of homes in Smithtown 11787.

How it measures up in Smithtown 11787

The dot is this home. The mark in the middle is the typical home in Smithtown 11787.

Estimated value$796,139
CheaperTypical $792,950Pricier

Pricier than 51% of homes nearby

Price per ft²$297
CheaperTypical $446Pricier

Pricier than 2% of homes nearby

Living area2,682 ft²
SmallerTypical 1,907 ft²Bigger

Bigger than 86% of homes nearby

Lot size1 ac
SmallerTypical 0.38 acBigger

Bigger than 94% of homes nearby

Year built1887
OlderTypical 1965Newer

Older than almost all homes nearby

How 15 Prospect St ranks against every home in each area.
MeasureThis homeSmithtownSmithtown 11787Suffolk County
Estimated valuepricier than$796,13948% of homes51% of homes65% of homes
Price per ft²pricier than$2972% of homes2% of homes10% of homes
Living areabigger than2,682 ft²82% of homes86% of homes88% of homes
Lot sizebigger than1 ac93% of homes94% of homes92% of homes
Year builtnewer than1887almost no homesalmost no homesalmost no homes

About 15 Prospect St

How much is 15 Prospect St, Smithtown, NY worth?

The TopHap Estimate for 15 Prospect St, Smithtown, NY is $796,139 as of Aug 30, 2026. The likely range is $742,232 to $850,046. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 15 Prospect St, Smithtown, NY last sell?

15 Prospect St, Smithtown, NY last sold on Mar 17, 2017 for $451,000, according to the county's recorded deed.

How big is 15 Prospect St, Smithtown, NY?

15 Prospect St, Smithtown, NY has 3 bedrooms, 1 bathrooms and 2,682 square feet of living space.

When was 15 Prospect St, Smithtown, NY built?

15 Prospect St, Smithtown, NY was built in 1887, making it 139 years old. It is a colonial home. The building has 2 stories.

What schools serve 15 Prospect St, Smithtown, NY?

15 Prospect St, Smithtown, NY is assigned to Smithtown Elementary School (elementary), rated B; Accompsett Middle School (middle), rated C+; Smithtown High School West (high), rated A. All sit in Smithtown Central School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 15 Prospect St, Smithtown, NY compare to other homes in Smithtown 11787?

Among the 11,479 homes in Smithtown 11787, it is worth more than 51% of them ($796,139 against a typical $792,950), its price per square foot is higher than 2% of them ($297 against a typical $446), it is bigger than 86% of them (2,682 ft² against a typical 1,907 ft²), its lot is bigger than 94% of them (1 ac against a typical 0.38 ac) and it is newer than almost none of them (1887 against a typical 1965). Measured against all of Suffolk County, it is worth more than 65% 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 15 Prospect St, Smithtown, NY?

The 2024 property tax bill for 15 Prospect St, Smithtown, NY was $11,471. The county assessed it at $4,380.

More homes on Prospect St

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Assigned schools

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