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Single Family ResidenceResidential
$499,802$537 / 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 89How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $145,000 on Dec 5, 2018

21 ASH ST

CENTRAL ISLIP, NY 11722
0
Baths
930 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1954
Year BuiltThe year the home was originally built, according to county records.

Valuation

$500K
$443K low$557K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$145,000 · Dec 5, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,051 (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.$24,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$6,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$18,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$350,704

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.0.23
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

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

E
Marguerite L Mulvey SchoolC
Elementary · Grades KG–6 · 0.3 mi
M
Charles a Mulligan Elementary SchoolC-
Middle · Grades KG–6 · 0.9 mi
H
Central Islip Senior High SchoolD+
High · Grades 9–12 · 1.5 mi

District: Central Islip Union Free School District

Neighborhood · ZIP 11722These 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.72
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.107
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.67

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.13%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.2%
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.37,500
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,450 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$98,750
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$123,293
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

21 Ash 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 89% of homes in Suffolk County
  • Costs more per square foot than 81% of homes in Central Islip 11722
  • Smaller than 92% of homes in Suffolk County
  • Has a bigger lot than 65% of homes in Central Islip 11722
  • Older than 80% of homes in Suffolk County

What homes are worth in Central Islip 11722

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

This home
$416K$776K

This home is worth more than 22% of homes in Central Islip 11722.

How it measures up in Central Islip 11722

The dot is this home. The mark in the middle is the typical home in Central Islip 11722.

Estimated value$499,802
CheaperTypical $549,683Pricier

Pricier than 22% of homes nearby

Price per ft²$537
CheaperTypical $411Pricier

Pricier than 81% of homes nearby

Living area930 ft²
SmallerTypical 1,351 ft²Bigger

Bigger than 14% of homes nearby

Lot size0.23 ac
SmallerTypical 0.18 acBigger

Bigger than 65% of homes nearby

Year built1954
OlderTypical 1966Newer

Newer than 23% of homes nearby

How 21 Ash St ranks against every home in each area.
MeasureThis homeCentral Islip 11722Suffolk County
Estimated valuepricier than$499,80222% of homes11% of homes
Price per ft²pricier than$53781% of homes77% of homes
Living areabigger than930 ft²14% of homes8% of homes
Lot sizebigger than0.23 ac65% of homes38% of homes
Year builtnewer than195423% of homes20% of homes

About 21 Ash St

How much is 21 Ash St, Central Islip, NY worth?

The TopHap Estimate for 21 Ash St, Central Islip, NY is $499,802 as of Sep 24, 2026. The likely range is $442,522 to $557,082. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Ash St, Central Islip, NY last sell?

21 Ash St, Central Islip, NY last sold on Dec 5, 2018 for $145,000, according to the county's recorded deed.

How big is 21 Ash St, Central Islip, NY?

21 Ash St, Central Islip, NY has 930 square feet of living space and a 0.23-acre lot.

When was 21 Ash St, Central Islip, NY built?

21 Ash St, Central Islip, NY was built in 1954, making it 72 years old.

What schools serve 21 Ash St, Central Islip, NY?

21 Ash St, Central Islip, NY is assigned to Marguerite L Mulvey School (elementary), rated C; Charles a Mulligan Elementary School (middle), rated C-; Central Islip Senior High School (high), rated D+. All sit in Central Islip Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Ash St, Central Islip, NY compare to other homes in Central Islip 11722?

Among the 8,244 homes in Central Islip 11722, it is worth more than 22% of them ($499,802 against a typical $549,683), its price per square foot is higher than 81% of them ($537 against a typical $411), it is bigger than 14% of them (930 ft² against a typical 1,351 ft²), its lot is bigger than 65% of them (0.23 ac against a typical 0.18 ac) and it is newer than 23% of them (1954 against a typical 1966). Measured against all of Suffolk County, it is worth more than 11% 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 Ash St, Central Islip, NY?

The 2024 property tax bill for 21 Ash St, Central Islip, NY was $8,051. The county assessed it at $24,900.

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