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Single Family ResidenceResidential
$3,223,899$985 / 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 90How 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 $1,675,500 on Nov 1, 2016

139 NORTHSIDE DR

SAG HARBOR, NY 11963
5
Beds
4
Baths
3,274 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.
1.32 ac
Lot SizeThe size of the land the home sits on, from county records.
2010
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$3.2M
$2.9M low$3.6M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,675,500 · Nov 1, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,345 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$1,938,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$750,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,188,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,076,667

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.23 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.Mobile Home
CountySUFFOLK
HeatingThe type of heating system in the home.Yes
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.Yes
ViewThe type of view from the property, or another feature of the site that affects value.Inferior
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 1,340 ft²Porch · 1,240 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
Pierson Middle/High SchoolA-
Middle · Grades 6–12 · 4.6 mi
E
Sag Harbor Elementary SchoolB+
Elementary · Grades PK–5 · 4.6 mi

District: Sag Harbor Union Free School District

Neighborhood · ZIP 11963These 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.174
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.100
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.47

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.65%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.0%
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.6,509
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.416 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$116,382
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$180,267
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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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

139 Northside Dr 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 Suffolk County
  • Costs more per square foot than 94% of homes in Suffolk County
  • Bigger than 94% of homes in Suffolk County
  • Has a bigger lot than 96% of homes in Suffolk County
  • Newer than 96% of homes in Suffolk County

What homes are worth in Sag Harbor 11963

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

This home
$830K$10M

This home is worth more than 71% of homes in Sag Harbor 11963.

How it measures up in Sag Harbor 11963

The dot is this home. The mark in the middle is the typical home in Sag Harbor 11963.

Estimated value$3,223,899
CheaperTypical $2,249,292Pricier

Pricier than 71% of homes nearby

Price per ft²$985
CheaperTypical $1142Pricier

Pricier than 29% of homes nearby

Living area3,274 ft²
SmallerTypical 2,038 ft²Bigger

Bigger than 78% of homes nearby

Lot size1.32 ac
SmallerTypical 0.51 acBigger

Bigger than 83% of homes nearby

Year built2010
OlderTypical 1999Newer

Newer than 79% of homes nearby

How 139 Northside Dr ranks against every home in each area.
MeasureThis homeNoyackSag Harbor 11963Suffolk County
Estimated valuepricier than$3,223,89982% of homes71% of homes96% of homes
Price per ft²pricier than$98536% of homes29% of homes94% of homes
Living areabigger than3,274 ft²83% of homes78% of homes94% of homes
Lot sizebigger than1.32 ac85% of homes83% of homes96% of homes
Year builtnewer than201081% of homes79% of homes96% of homes

About 139 Northside Dr

How much is 139 Northside Dr, Sag Harbor, NY worth?

The TopHap Estimate for 139 Northside Dr, Sag Harbor, NY is $3,223,899 as of Sep 24, 2026. The likely range is $2,891,787 to $3,556,011. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 139 Northside Dr, Sag Harbor, NY last sell?

139 Northside Dr, Sag Harbor, NY last sold on Nov 1, 2016 for $1,675,500, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 139 Northside Dr, Sag Harbor, NY?

139 Northside Dr, Sag Harbor, NY has 5 bedrooms, 4 bathrooms and 3,274 square feet of living space.

When was 139 Northside Dr, Sag Harbor, NY built?

139 Northside Dr, Sag Harbor, NY was built in 2010, making it 16 years old. It is a mobile home home. The building has 2 stories.

What schools serve 139 Northside Dr, Sag Harbor, NY?

139 Northside Dr, Sag Harbor, NY is assigned to Pierson Middle/High School (middle), rated A-; Sag Harbor Elementary School (elementary), rated B+. All sit in Sag Harbor Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 139 Northside Dr, Sag Harbor, NY compare to other homes in Sag Harbor 11963?

Among the 4,371 homes in Sag Harbor 11963, it is worth more than 71% of them ($3,223,899 against a typical $2,249,292), its price per square foot is higher than 29% of them ($985 against a typical $1142), it is bigger than 78% of them (3,274 ft² against a typical 2,038 ft²), its lot is bigger than 83% of them (1.32 ac against a typical 0.51 ac) and it is newer than 79% of them (2010 against a typical 1999). Measured against all of Suffolk 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 139 Northside Dr, Sag Harbor, NY?

The 2024 property tax bill for 139 Northside Dr, Sag Harbor, NY was $12,345. The county assessed it at $1,938,300.

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