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Single Family ResidenceResidential
$1,346,607$388 / 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 96How 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

426 MILL RIVER RD

OYSTER BAY, NY 11771
3.5
Baths
3,474 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.
1.01 ac
Lot SizeThe size of the land the home sits on, from county records.
1987
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
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

$1.3M
$1.3M low$1.4M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$18,663 (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.$858 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$396
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$462
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$936
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$858,000

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.49
72
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
24
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
62
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
89
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
1
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.45 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%

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
CountyNASSAU
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, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 576 ft²Patio · 100 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.

M
Oyster Bay Middle SchoolA+
Middle · Grades 7–8 · 1.9 mi
H
Oyster Bay High SchoolA
High · Grades 9–12 · 1.9 mi
E
Theodore Roosevelt School
Elementary · Grades PK–2 · 1.9 mi

District: Oyster Bay-East Norwich Central School District

Neighborhood · ZIP 11771These 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.119
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.111
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.92

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.5%
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.11,584
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.763 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$154,579
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$198,115
Average tempThe average temperature here across a full year.52°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

426 Mill River 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 85% of homes in Nassau County
  • Costs less per square foot than 96% of homes in East Norwich
  • Bigger than 94% of homes in Nassau County
  • Has a bigger lot than 97% of homes in Nassau County
  • Newer than 94% of homes in East Norwich

What homes are worth in Oyster Bay 11771

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

This home
$594K$6.6M

This home is worth more than 48% of homes in Oyster Bay 11771.

How it measures up in Oyster Bay 11771

The dot is this home. The mark in the middle is the typical home in Oyster Bay 11771.

Estimated value$1,346,607
CheaperTypical $1,406,539Pricier

Pricier than 48% of homes nearby

Price per ft²$388
CheaperTypical $548Pricier

Pricier than 5% of homes nearby

Living area3,474 ft²
SmallerTypical 2,522 ft²Bigger

Bigger than 66% of homes nearby

Lot size1.01 ac
SmallerTypical 0.29 acBigger

Bigger than 60% of homes nearby

Year built1987
OlderTypical 1958Newer

Newer than 85% of homes nearby

How 426 Mill River Rd ranks against every home in each area.
MeasureThis homeEast NorwichOyster Bay 11771Nassau County
Estimated valuepricier than$1,346,60783% of homes48% of homes85% of homes
Price per ft²pricier than$3884% of homes5% of homes9% of homes
Living areabigger than3,474 ft²92% of homes66% of homes94% of homes
Lot sizebigger than1.01 ac89% of homes60% of homes97% of homes
Year builtnewer than198794% of homes85% of homes91% of homes

About 426 Mill River Rd

How much is 426 Mill River Rd, Oyster Bay, NY worth?

The TopHap Estimate for 426 Mill River Rd, Oyster Bay, NY is $1,346,607 as of Aug 30, 2026. The likely range is $1,294,389 to $1,398,825. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 426 Mill River Rd, Oyster Bay, NY last sell?

426 Mill River Rd, Oyster Bay, NY last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 426 Mill River Rd, Oyster Bay, NY?

426 Mill River Rd, Oyster Bay, NY has 3.5 bathrooms and 3,474 square feet of living space.

When was 426 Mill River Rd, Oyster Bay, NY built?

426 Mill River Rd, Oyster Bay, NY was built in 1987, making it 39 years old. It is a colonial home. The building has 2 stories.

What schools serve 426 Mill River Rd, Oyster Bay, NY?

426 Mill River Rd, Oyster Bay, NY is assigned to Oyster Bay Middle School (middle), rated A+; Oyster Bay High School (high), rated A; Theodore Roosevelt School (elementary). All sit in Oyster Bay-East Norwich Central School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 426 Mill River Rd, Oyster Bay, NY compare to other homes in Oyster Bay 11771?

Among the 3,028 homes in Oyster Bay 11771, it is worth more than 48% of them ($1,346,607 against a typical $1,406,539), its price per square foot is higher than 5% of them ($388 against a typical $548), it is bigger than 66% of them (3,474 ft² against a typical 2,522 ft²), its lot is bigger than 60% of them (1.01 ac against a typical 0.29 ac) and it is newer than 85% of them (1987 against a typical 1958). Measured against all of Nassau County, it is worth more than 85% 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 426 Mill River Rd, Oyster Bay, NY?

The 2025 property tax bill for 426 Mill River Rd, Oyster Bay, NY was $18,663. The county assessed it at $858.

More homes on Mill River Rd

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