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Single Family ResidenceResidential
$499,298$476 / 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 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $135,000 on Jul 8, 2009

21 PROSPECT ST

AMITYVILLE, NY 11701
1
Baths
1,050 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1909
Year BuiltThe year the home was originally built, according to county records.

Valuation

$499K
$475K low$524K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$135,000 · Jul 8, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,575 (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.$2,870 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$230
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$2,640
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$148,705

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.136 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.69%
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.1 percent flood zone

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
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.12
PoolWhether the property has a pool, and what kind, such as in-ground.No

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

H
Amityville Memorial High SchoolD+
High · Grades 9–12 · 0.7 mi
M
Edmund W. Miles Middle SchoolC-
Middle · Grades 6–8 · 2.0 mi
E
Northwest Elementary School
Elementary · Grades KG–2 · 2.2 mi

District: Amityville Union Free School District

Neighborhood · ZIP 11701These 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.80
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.110
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.81

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.16%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.8%
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.26,590
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,033 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$104,679
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$140,592
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.49 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 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 less than 91% of homes in Suffolk County
  • Costs more per square foot than 71% of homes in Amityville 11701
  • Smaller than 86% of homes in Suffolk County
  • Has a smaller lot than 93% of homes in Amityville 11701
  • Older than 98% of homes in Suffolk County

What homes are worth in Amityville 11701

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

This home
$419K$1.3M

This home is worth more than 10% of homes in Amityville 11701.

How it measures up in Amityville 11701

The dot is this home. The mark in the middle is the typical home in Amityville 11701.

Estimated value$499,298
CheaperTypical $628,276Pricier

Pricier than 10% of homes nearby

Price per ft²$476
CheaperTypical $400Pricier

Pricier than 71% of homes nearby

Living area1,050 ft²
SmallerTypical 1,634 ft²Bigger

Bigger than 19% of homes nearby

Lot size0.11 ac
SmallerTypical 0.2 acBigger

Bigger than 7% of homes nearby

Year built1909
OlderTypical 1954Newer

Newer than 4% of homes nearby

How 21 Prospect St ranks against every home in each area.
MeasureThis homeAmityville 11701Suffolk County
Estimated valuepricier than$499,29810% of homes9% of homes
Price per ft²pricier than$47671% of homes66% of homes
Living areabigger than1,050 ft²19% of homes14% of homes
Lot sizebigger than0.11 ac7% of homes9% of homes
Year builtnewer than19094% of homes2% of homes

About 21 Prospect St

How much is 21 Prospect St, Amityville, NY worth?

The TopHap Estimate for 21 Prospect St, Amityville, NY is $499,298 as of Jul 14, 2026. The likely range is $474,592 to $524,004. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Prospect St, Amityville, NY last sell?

21 Prospect St, Amityville, NY last sold on Jul 8, 2009 for $135,000, according to the county's recorded deed.

How big is 21 Prospect St, Amityville, NY?

21 Prospect St, Amityville, NY has 1 bathrooms, 1,050 square feet of living space and a 0.12-acre lot.

When was 21 Prospect St, Amityville, NY built?

21 Prospect St, Amityville, NY was built in 1909, making it 117 years old.

What schools serve 21 Prospect St, Amityville, NY?

21 Prospect St, Amityville, NY is assigned to Amityville Memorial High School (high), rated D+; Edmund W. Miles Middle School (middle), rated C-; Northwest Elementary School (elementary). All sit in Amityville Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Prospect St, Amityville, NY compare to other homes in Amityville 11701?

Among the 6,225 homes in Amityville 11701, it is worth more than 10% of them ($499,298 against a typical $628,276), its price per square foot is higher than 71% of them ($476 against a typical $400), it is bigger than 19% of them (1,050 ft² against a typical 1,634 ft²), its lot is bigger than 7% of them (0.11 ac against a typical 0.2 ac) and it is newer than 4% of them (1909 against a typical 1954). Measured against all of Suffolk 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 Prospect St, Amityville, NY?

The 2024 property tax bill for 21 Prospect St, Amityville, NY was $7,575. The county assessed it at $2,870.

More homes on Prospect St

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Assigned schools

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