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Single Family ResidenceResidential
$2,434,079$578 / 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 93How 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
Last sold for $2,400,000 on Jun 9, 2026

422 MILL RIVER RD

OYSTER BAY, NY 11771
3.5
Baths
4,210 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.
0.97 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.
1
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

$2.4M
$2.3M low$2.6M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$2,400,000 · Jun 9, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$21,774 (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.$1,140 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$526
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$614
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,140
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,140,000

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.47
61
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.25 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.Contemporary
CountyNASSAU
Lot (acres)The size of the land the home sits on, from county records.0.97
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 532 ft²Patio · 532 ft²

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.

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%

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

422 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.

  • Among the most valuable homes in East Norwich
  • Costs more per square foot than 74% of homes in East Norwich
  • Bigger than 97% of homes in Nassau County
  • Has a bigger lot than 96% 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
$604K$6.5M

This home is worth more than 79% 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$2,434,079
CheaperTypical $1,408,549Pricier

Pricier than 79% of homes nearby

Price per ft²$578
CheaperTypical $547Pricier

Pricier than 62% of homes nearby

Living area4,210 ft²
SmallerTypical 2,520 ft²Bigger

Bigger than 74% of homes nearby

Lot size0.97 ac
SmallerTypical 0.29 acBigger

Bigger than 59% of homes nearby

Year built1987
OlderTypical 1958Newer

Newer than 85% of homes nearby

How 422 Mill River Rd ranks against every home in each area.
MeasureThis homeEast NorwichOyster Bay 11771Nassau County
Estimated valuepricier than$2,434,079almost all homes79% of homes96% of homes
Price per ft²pricier than$57874% of homes62% of homes70% of homes
Living areabigger than4,210 ft²95% of homes74% of homes97% of homes
Lot sizebigger than0.97 ac86% of homes59% of homes96% of homes
Year builtnewer than198794% of homes85% of homes91% of homes

About 422 Mill River Rd

How much is 422 Mill River Rd, Oyster Bay, NY worth?

The TopHap Estimate for 422 Mill River Rd, Oyster Bay, NY is $2,434,079 as of Aug 30, 2026. The likely range is $2,262,699 to $2,605,459. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 422 Mill River Rd, Oyster Bay, NY last sell?

422 Mill River Rd, Oyster Bay, NY last sold on Jun 9, 2026 for $2,400,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 422 Mill River Rd, Oyster Bay, NY?

422 Mill River Rd, Oyster Bay, NY has 3.5 bathrooms, 4,210 square feet of living space and a 0.97-acre lot.

When was 422 Mill River Rd, Oyster Bay, NY built?

422 Mill River Rd, Oyster Bay, NY was built in 1987, making it 39 years old. It is a contemporary home. The building has 1 story.

What schools serve 422 Mill River Rd, Oyster Bay, NY?

422 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 422 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 79% of them ($2,434,079 against a typical $1,408,549), its price per square foot is higher than 62% of them ($578 against a typical $547), it is bigger than 74% of them (4,210 ft² against a typical 2,520 ft²), its lot is bigger than 59% of them (0.97 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 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 422 Mill River Rd, Oyster Bay, NY?

The 2025 property tax bill for 422 Mill River Rd, Oyster Bay, NY was $21,774. The county assessed it at $1,140.

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