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Single Family ResidenceResidential
$2,434,886$563 / 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 Sep 24, 2026
Last sold for $1,388,888 on Feb 29, 2016

31 MILL RIVER RD

OYSTER BAY, NY 11771
3.5
Baths
4,327 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.
7.57 ac
Lot SizeThe size of the land the home sits on, from county records.
1986
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
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

$2.4M
$2.2M low$2.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,388,888 · Feb 29, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$34,504 (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.$2,191 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,457
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$734
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$2,191
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,191,000

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.33 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
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.No
ViewThe type of view from the property, or another feature of the site that affects value.Highway
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 702 ft²Patio · 702 ft²Porch · 456 ft²

Transaction History(3)

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
Theodore Roosevelt School
Elementary · Grades PK–2 · 0.8 mi
M
Oyster Bay Middle SchoolA+
Middle · Grades 7–8 · 1.1 mi
H
Oyster Bay High SchoolA
High · Grades 9–12 · 1.1 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%

Owner Tools

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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

31 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 96% of homes in Nassau County
  • Costs more per square foot than 65% of homes in Nassau County
  • Bigger than 96% of homes in Nassau County
  • Among the largest lots in Nassau County
  • Newer than 90% of homes in Nassau County

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
$618K$6.7M

This home is worth more than 80% 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$2,434,886
CheaperTypical $1,373,267Pricier

Pricier than 80% of homes nearby

Price per ft²$563
CheaperTypical $534Pricier

Pricier than 59% of homes nearby

Living area4,327 ft²
SmallerTypical 2,516 ft²Bigger

Bigger than 76% of homes nearby

Lot size7.57 ac
SmallerTypical 0.29 acBigger

Bigger than 98% of homes nearby

Year built1986
OlderTypical 1958Newer

Newer than 84% of homes nearby

How 31 Mill River Rd ranks against every home in each area.
MeasureThis homeOyster Bay 11771Nassau County
Estimated valuepricier than$2,434,88680% of homes96% of homes
Price per ft²pricier than$56359% of homes65% of homes
Living areabigger than4,327 ft²76% of homes96% of homes
Lot sizebigger than7.57 ac98% of homesalmost all homes
Year builtnewer than198684% of homes90% of homes

About 31 Mill River Rd

How much is 31 Mill River Rd, Oyster Bay, NY worth?

The TopHap Estimate for 31 Mill River Rd, Oyster Bay, NY is $2,434,886 as of Sep 24, 2026. The likely range is $2,176,783 to $2,692,989. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 31 Mill River Rd, Oyster Bay, NY last sell?

31 Mill River Rd, Oyster Bay, NY last sold on Feb 29, 2016 for $1,388,888, according to the county's recorded deed.

How big is 31 Mill River Rd, Oyster Bay, NY?

31 Mill River Rd, Oyster Bay, NY has 3.5 bathrooms and 4,327 square feet of living space.

When was 31 Mill River Rd, Oyster Bay, NY built?

31 Mill River Rd, Oyster Bay, NY was built in 1986, making it 40 years old. It is a colonial home. The building has 2 stories.

What schools serve 31 Mill River Rd, Oyster Bay, NY?

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

How does 31 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 80% of them ($2,434,886 against a typical $1,373,267), its price per square foot is higher than 59% of them ($563 against a typical $534), it is bigger than 76% of them (4,327 ft² against a typical 2,516 ft²), its lot is bigger than 98% of them (7.57 ac against a typical 0.29 ac) and it is newer than 84% of them (1986 against a typical 1958). Measured against all of Nassau County, it is worth more than 96% 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 31 Mill River Rd, Oyster Bay, NY?

The 2025 property tax bill for 31 Mill River Rd, Oyster Bay, NY was $34,504. The county assessed it at $2,191.

More homes on Mill River Rd

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