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Single Family ResidenceResidential
$540,906$486 / 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 88How 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

91 UNION ST

FREEPORT, NY 11520
1.5
Baths
1,112 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1938
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$541K
$479K low$603K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$678 (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.$356 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$121
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$235
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$356
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$356,000

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.0.12
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
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.Porch · 168 ft²

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

M
John W Dodd Middle SchoolB-
Middle · Grades 7–8 · 1.0 mi
E
New Visions Elementary SchoolA
Elementary · Grades KG–4 · 1.2 mi
H
Freeport High SchoolC-
High · Grades 9–12 · 1.5 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

91 Union 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 97% of homes in Nassau County
  • Costs more per square foot than 83% of homes in Freeport 11520
  • Smaller than 92% of homes in Nassau County
  • Has a smaller lot than 89% of homes in Freeport 11520
  • Older than 78% 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
$422K$952K

This home is worth more than 16% 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$540,906
CheaperTypical $636,465Pricier

Pricier than 16% of homes nearby

Price per ft²$486
CheaperTypical $404Pricier

Pricier than 83% of homes nearby

Living area1,112 ft²
SmallerTypical 1,634 ft²Bigger

Bigger than 11% of homes nearby

Lot size0.11 ac
SmallerTypical 0.14 acBigger

Bigger than 11% of homes nearby

Year built1938
OlderTypical 1946Newer

Newer than 47% of homes nearby

How 91 Union St ranks against every home in each area.
MeasureThis homeFreeport 11520Nassau County
Estimated valuepricier than$540,90616% of homes3% of homes
Price per ft²pricier than$48683% of homes39% of homes
Living areabigger than1,112 ft²11% of homes8% of homes
Lot sizebigger than0.11 ac11% of homes16% of homes
Year builtnewer than193847% of homes22% of homes

About 91 Union St

How much is 91 Union St, Freeport, NY worth?

The TopHap Estimate for 91 Union St, Freeport, NY is $540,906 as of Oct 21, 2026. The likely range is $478,682 to $603,130. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 91 Union St, Freeport, NY last sell?

91 Union St, Freeport, NY last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 91 Union St, Freeport, NY?

91 Union St, Freeport, NY has 1.5 bathrooms, 1,112 square feet of living space and a 0.12-acre lot.

When was 91 Union St, Freeport, NY built?

91 Union St, Freeport, NY was built in 1938, making it 88 years old. The building has 1 story.

What schools serve 91 Union St, Freeport, NY?

91 Union St, Freeport, NY is assigned to John W Dodd Middle School (middle), rated B-; New Visions Elementary School (elementary), rated A; Freeport High School (high), rated C-. All sit in Freeport Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 91 Union St, Freeport, NY compare to other homes in Freeport 11520?

Among the 9,174 homes in Freeport 11520, it is worth more than 16% of them ($540,906 against a typical $636,465), its price per square foot is higher than 83% of them ($486 against a typical $404), it is bigger than 11% of them (1,112 ft² against a typical 1,634 ft²), its lot is bigger than 11% of them (0.11 ac against a typical 0.14 ac) and it is newer than 47% of them (1938 against a typical 1946). Measured against all of Nassau County, it is worth more than 3% 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 91 Union St, Freeport, NY?

The 2025 property tax bill for 91 Union St, Freeport, NY was $678. The county assessed it at $356.

More homes on Union St

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