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Single Family ResidenceResidential
$691,769$438 / 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 94How 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

21 PROSPECT ST

FARMINGDALE, NY 11735
2
Baths
1,579 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.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
1930
Year BuiltThe year the home was originally built, according to county records.
1
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

$692K
$652K low$731K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,015 (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.$430 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$199
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$231
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$461
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$430,000

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.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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
CountyNASSAU
Lot (acres)The size of the land the home sits on, from county records.0.14
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.Tile
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
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.Porch · 127 ft²

Transaction History(1)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Neighborhood · ZIP 11735These 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.84
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 100.86

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.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.7%
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.33,412
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,932 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$129,849
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$157,978
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.57%

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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 78% of homes in Nassau County
  • Costs less per square foot than 77% of homes in Nassau County
  • Has a smaller lot than 76% of homes in Farmingdale 11735
  • Older than 91% of homes in Farmingdale 11735

What homes are worth in Farmingdale 11735

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

This home
$512K$1.2M

This home is worth more than 39% of homes in Farmingdale 11735.

How it measures up in Farmingdale 11735

The dot is this home. The mark in the middle is the typical home in Farmingdale 11735.

Estimated value$691,769
CheaperTypical $717,320Pricier

Pricier than 39% of homes nearby

Price per ft²$438
CheaperTypical $478Pricier

Pricier than 32% of homes nearby

Living area1,579 ft²
SmallerTypical 1,516 ft²Bigger

Bigger than 55% of homes nearby

Lot size0.14 ac
SmallerTypical 0.16 acBigger

Bigger than 24% of homes nearby

Year built1930
OlderTypical 1955Newer

Newer than 9% of homes nearby

How 21 Prospect St ranks against every home in each area.
MeasureThis homeFarmingdale 11735Nassau County
Estimated valuepricier than$691,76939% of homes22% of homes
Price per ft²pricier than$43832% of homes23% of homes
Living areabigger than1,579 ft²55% of homes40% of homes
Lot sizebigger than0.14 ac24% of homes44% of homes
Year builtnewer than19309% of homes17% of homes

About 21 Prospect St

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

The TopHap Estimate for 21 Prospect St, Farmingdale, NY is $691,769 as of Aug 30, 2026. The likely range is $652,478 to $731,060. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

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

21 Prospect St, Farmingdale, NY last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Prospect St, Farmingdale, NY?

21 Prospect St, Farmingdale, NY has 2 bathrooms, 1,579 square feet of living space and a 0.14-acre lot.

When was 21 Prospect St, Farmingdale, NY built?

21 Prospect St, Farmingdale, NY was built in 1930, making it 96 years old. It is a cape cod home. The building has 1 story.

How does 21 Prospect St, Farmingdale, NY compare to other homes in Farmingdale 11735?

Among the 8,983 homes in Farmingdale 11735, it is worth more than 39% of them ($691,769 against a typical $717,320), its price per square foot is higher than 32% of them ($438 against a typical $478), it is bigger than 55% of them (1,579 ft² against a typical 1,516 ft²), its lot is bigger than 24% of them (0.14 ac against a typical 0.16 ac) and it is newer than 9% of them (1930 against a typical 1955). Measured against all of Nassau County, it is worth more than 22% 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, Farmingdale, NY?

The 2025 property tax bill for 21 Prospect St, Farmingdale, NY was $11,015. The county assessed it at $430.

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