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Duplex (2 Units, Any Combination)Residential
Last sold for $800,000 on Jan 6, 2025

21 ISLAND ST

PLAINVIEW, NY 11803
5
Beds
4
Baths
1,556 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
1959
Year BuiltThe year the home was originally built, according to county records.
1
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$800,000 · Jan 6, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,416 (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.$529 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$303
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$226
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$519
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$529,000

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.14 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Duplex (2 Units, Any Combination)
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.0.18
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No
ViewThe type of view from the property, or another feature of the site that affects value.Commercial/Industrial
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 20 ft²

Transaction History(3)

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
Stratford Road Elementary SchoolA+
Elementary · Grades KG–4 · 0.9 mi
M
Plainview-Old Bethpage Middle SchoolA+
Middle · Grades 5–8 · 1.3 mi
H
Plainview-Old Bethpage John F. Kennedy High SchoolA
High · Grades 9–12 · 2.3 mi

District: Plainview-Old Bethpage Central School District

Neighborhood · ZIP 11803These 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.58
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 100.87

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.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.6%
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.28,935
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,867 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$166,800
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$201,048
Average tempThe average temperature here across a full year.52°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.56%

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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 Island 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.

  • Smaller than 65% of homes in Plainview
  • Has a bigger lot than 70% of homes in Plainview
  • Newer than 75% of homes in Nassau County

How it measures up in Plainview 11803

The dot is this home. The mark in the middle is the typical home in Plainview 11803.

Living area1,556 ft²
SmallerTypical 1,717 ft²Bigger

Bigger than 35% of homes nearby

Lot size0.18 ac
SmallerTypical 0.16 acBigger

Bigger than 69% of homes nearby

Year built1959
OlderTypical 1958Newer

Newer than 60% of homes nearby

How 21 Island St ranks against every home in each area.
MeasureThis homePlainviewPlainview 11803Nassau County
Living areabigger than1,556 ft²35% of homes35% of homes39% of homes
Lot sizebigger than0.18 ac70% of homes69% of homes70% of homes
Year builtnewer than195966% of homes60% of homes75% of homes

About 21 Island St

When did 21 Island St, Plainview, NY last sell?

21 Island St, Plainview, NY last sold on Jan 6, 2025 for $800,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 Island St, Plainview, NY?

21 Island St, Plainview, NY has 5 bedrooms, 4 bathrooms, 1,556 square feet of living space and a 0.18-acre lot.

When was 21 Island St, Plainview, NY built?

21 Island St, Plainview, NY was built in 1959, making it 67 years old. It is a cape cod home. The building has 1 story.

What schools serve 21 Island St, Plainview, NY?

21 Island St, Plainview, NY is assigned to Stratford Road Elementary School (elementary), rated A+; Plainview-Old Bethpage Middle School (middle), rated A+; Plainview-Old Bethpage John F. Kennedy High School (high), rated A. All sit in Plainview-Old Bethpage Central School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Island St, Plainview, NY compare to other homes in Plainview 11803?

Among the 10,832 homes in Plainview 11803, it is bigger than 35% of them (1,556 ft² against a typical 1,717 ft²), its lot is bigger than 69% of them (0.18 ac against a typical 0.16 ac) and it is newer than 60% of them (1959 against a typical 1958). 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 Island St, Plainview, NY?

The 2025 property tax bill for 21 Island St, Plainview, NY was $15,416. The county assessed it at $529.

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