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Single Family ResidenceResidential
$615,348$334 / 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 Aug 30, 2026

27 ONSLOW PL

FREEPORT, NY 11520
1
Baths
1,840 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.
0.24 ac
Lot SizeThe size of the land the home sits on, from county records.
1915
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$615K
$550K low$681K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,513 (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.$380 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$170
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$210
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$390
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$380,000

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.52 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.60%
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
CountyNASSAU
Lot (acres)The size of the land the home sits on, from county records.0.24
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
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
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.Deck · 360 ft²Patio · 360 ft²Porch · 16 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.

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

E
Archer Street SchoolA-
Elementary · Grades KG–4 · 0.3 mi
H
Freeport High SchoolC-
High · Grades 9–12 · 0.8 mi
M
John W Dodd Middle SchoolC+
Middle · Grades 7–8 · 0.8 mi

District: Freeport Union Free School District

Neighborhood · ZIP 11520These 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.104
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 100.85

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.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.44,881
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,383 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$108,641
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$142,991
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.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

27 Onslow Pl 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 91% of homes in Nassau County
  • Costs less per square foot than 97% of homes in Nassau County
  • Has a bigger lot than 88% of homes in Freeport 11520
  • Older than 97% of homes in Nassau County

What homes are worth in Freeport 11520

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

This home
$405K$931K

This home is worth more than 40% of homes in Freeport 11520.

How it measures up in Freeport 11520

The dot is this home. The mark in the middle is the typical home in Freeport 11520.

Estimated value$615,348
CheaperTypical $642,752Pricier

Pricier than 40% of homes nearby

Price per ft²$334
CheaperTypical $407Pricier

Pricier than 18% of homes nearby

Living area1,840 ft²
SmallerTypical 1,640 ft²Bigger

Bigger than 63% of homes nearby

Lot size0.24 ac
SmallerTypical 0.14 acBigger

Bigger than 88% of homes nearby

Year built1915
OlderTypical 1941Newer

Newer than 13% of homes nearby

How 27 Onslow Pl ranks against every home in each area.
MeasureThis homeFreeport 11520Nassau County
Estimated valuepricier than$615,34840% of homes9% of homes
Price per ft²pricier than$33418% of homes3% of homes
Living areabigger than1,840 ft²63% of homes56% of homes
Lot sizebigger than0.24 ac88% of homes85% of homes
Year builtnewer than191513% of homes3% of homes

About 27 Onslow Pl

How much is 27 Onslow Pl, Freeport, NY worth?

The TopHap Estimate for 27 Onslow Pl, Freeport, NY is $615,348 as of Aug 30, 2026. The likely range is $549,552 to $681,144. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 27 Onslow Pl, Freeport, NY last sell?

27 Onslow Pl, Freeport, NY last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 27 Onslow Pl, Freeport, NY?

27 Onslow Pl, Freeport, NY has 1 bathrooms, 1,840 square feet of living space and a 0.24-acre lot.

When was 27 Onslow Pl, Freeport, NY built?

27 Onslow Pl, Freeport, NY was built in 1915, making it 111 years old. The building has 2 stories.

What schools serve 27 Onslow Pl, Freeport, NY?

27 Onslow Pl, Freeport, NY is assigned to Archer Street School (elementary), rated A-; Freeport High School (high), rated C-; John W Dodd Middle School (middle), rated C+. All sit in Freeport Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 27 Onslow Pl, Freeport, NY compare to other homes in Freeport 11520?

Among the 9,174 homes in Freeport 11520, it is worth more than 40% of them ($615,348 against a typical $642,752), its price per square foot is higher than 18% of them ($334 against a typical $407), it is bigger than 63% of them (1,840 ft² against a typical 1,640 ft²), its lot is bigger than 88% of them (0.24 ac against a typical 0.14 ac) and it is newer than 13% of them (1915 against a typical 1941). Measured against all of Nassau County, it is worth more than 9% 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 27 Onslow Pl, Freeport, NY?

The 2025 property tax bill for 27 Onslow Pl, Freeport, NY was $7,513. The county assessed it at $380.

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