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Single Family ResidenceResidential
$902,271$302 / 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 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $380,625 on Mar 26, 2019

20 ROCK ISLAND RD

CENTEREACH, NY 11720
4
Beds
2
Baths
2,992 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.
1.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1999
Year BuiltThe year the home was originally built, according to county records.
2
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.

Valuation

$902K
$829K low$976K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$380,625 · Mar 26, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$17,239 (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.$3,920 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$3,520
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$816,666

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.29 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.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Colonial
CountySUFFOLK
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
FireplaceWhether the home has a fireplace, and what kind.Yes
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.Waterfront

Transaction History(4)

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

Foreclosure Filings(1)

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

E
Unity Drive Kindergarten-Pre K Center
Elementary · Grades PK–KG · 0.5 mi
H
Centereach High SchoolB
High · Grades 8–12 · 1.1 mi
M
Dawnwood Middle SchoolB+
Middle · Grades 6–8 · 1.1 mi

District: Middle Country Central School District

Neighborhood · ZIP 11720These 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.55
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.63

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.9%
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.28,643
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,486 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$124,063
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$145,246
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 Rock Island Rd 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 more than 95% of homes in Centereach 11720
  • Costs less per square foot than 90% of homes in Centereach 11720
  • Bigger than 97% of homes in Centereach 11720
  • Among the largest lots in Centereach 11720
  • Newer than 94% of homes in Centereach 11720

What homes are worth in Centereach 11720

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

This home
$437K$1.1M

This home is worth more than 95% of homes in Centereach 11720.

How it measures up in Centereach 11720

The dot is this home. The mark in the middle is the typical home in Centereach 11720.

Estimated value$902,271
CheaperTypical $627,643Pricier

Pricier than 95% of homes nearby

Price per ft²$302
CheaperTypical $380Pricier

Pricier than 10% of homes nearby

Living area2,992 ft²
SmallerTypical 1,637 ft²Bigger

Bigger than 97% of homes nearby

Lot size1.23 ac
SmallerTypical 0.31 acBigger

Bigger than almost all homes nearby

Year built1999
OlderTypical 1965Newer

Newer than 94% of homes nearby

How 20 Rock Island Rd ranks against every home in each area.
MeasureThis homeCentereach 11720Suffolk County
Estimated valuepricier than$902,27195% of homes74% of homes
Price per ft²pricier than$30210% of homes11% of homes
Living areabigger than2,992 ft²97% of homes91% of homes
Lot sizebigger than1.23 acalmost all homes95% of homes
Year builtnewer than199994% of homes87% of homes

About 20 Rock Island Rd

How much is 20 Rock Island Rd, Centereach, NY worth?

The TopHap Estimate for 20 Rock Island Rd, Centereach, NY is $902,271 as of Oct 21, 2026. The likely range is $828,515 to $976,027. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Rock Island Rd, Centereach, NY last sell?

20 Rock Island Rd, Centereach, NY last sold on Mar 26, 2019 for $380,625, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 20 Rock Island Rd, Centereach, NY?

20 Rock Island Rd, Centereach, NY has 4 bedrooms, 2 bathrooms and 2,992 square feet of living space.

When was 20 Rock Island Rd, Centereach, NY built?

20 Rock Island Rd, Centereach, NY was built in 1999, making it 27 years old. It is a colonial home. The building has 2 stories.

What schools serve 20 Rock Island Rd, Centereach, NY?

20 Rock Island Rd, Centereach, NY is assigned to Unity Drive Kindergarten-Pre K Center (elementary); Centereach High School (high), rated B; Dawnwood Middle School (middle), rated B+. All sit in Middle Country Central School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Rock Island Rd, Centereach, NY compare to other homes in Centereach 11720?

Among the 8,536 homes in Centereach 11720, it is worth more than 95% of them ($902,271 against a typical $627,643), its price per square foot is higher than 10% of them ($302 against a typical $380), it is bigger than 97% of them (2,992 ft² against a typical 1,637 ft²), its lot is bigger than almost all of them (1.23 ac against a typical 0.31 ac) and it is newer than 94% of them (1999 against a typical 1965). Measured against all of Suffolk County, it is worth more than 74% 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 20 Rock Island Rd, Centereach, NY?

The 2024 property tax bill for 20 Rock Island Rd, Centereach, NY was $17,239. The county assessed it at $3,920.

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