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Residential (General/Single)Residential
$470,385
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 Sep 24, 2026

20 WALNUT ST

CENTRAL ISLIP, NY 11722
0
Baths
4,000 ft²
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$470K
$437K low$503K high

Tax & Assessment

Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$40 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$40
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$60

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.23 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.Residential (General/Single)
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.09
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.

E
Lafrancis Hardiman Elementary School
Elementary · Grades PK–2 · 0.3 mi
H
Wyandanch Memorial High SchoolD-
High · Grades 9–12 · 0.9 mi
M
Milton L. Olive Middle SchoolD
Middle · Grades 6–8 · 1.1 mi

District: Wyandanch 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

20 Walnut 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 93% of homes in Suffolk County
  • Has a smaller lot than 97% of homes in Wyandanch

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
$412K$769K

This home is worth more than 11% 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$470,385
CheaperTypical $549,815Pricier

Pricier than 11% of homes nearby

Lot size4,000 ft²
SmallerTypical 0.18 acBigger

Bigger than 20% of homes nearby

How 20 Walnut St ranks against every home in each area.
MeasureThis homeWyandanchCentral Islip 11722Suffolk County
Estimated valuepricier than$470,38532% of homes11% of homes7% of homes
Lot sizebigger than4,000 ft²3% of homes20% of homes7% of homes

About 20 Walnut St

How much is 20 Walnut St, Central Islip, NY worth?

The TopHap Estimate for 20 Walnut St, Central Islip, NY is $470,385 as of Sep 24, 2026. The likely range is $437,320 to $503,450. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Walnut St, Central Islip, NY last sell?

20 Walnut St, Central Islip, NY last sold on Jan 1, 1900, according to the county's recorded deed.

What schools serve 20 Walnut St, Central Islip, NY?

20 Walnut St, Central Islip, NY is assigned to Lafrancis Hardiman Elementary School (elementary); Wyandanch Memorial High School (high), rated D-; Milton L. Olive Middle School (middle), rated D. All sit in Wyandanch Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Walnut St, Central Islip, NY compare to other homes in Central Islip 11722?

Among the 8,245 homes in Central Islip 11722, it is worth more than 11% of them ($470,385 against a typical $549,815) and its lot is bigger than 20% of them (4,000 ft² against a typical 0.18 ac). Measured against all of Suffolk County, it is worth more than 7% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

More homes on Walnut St

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Assigned schools

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