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Single Family ResidenceResidential
$644,080$333 / 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 92How 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

121 ROSEMONT AVE

FARMINGVILLE, NY 11738
4
Beds
2
Baths
1,933 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1971
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

$644K
$594K low$694K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,794 (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.$2,560 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$250
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$2,310
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$533,333

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.Cape Cod
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.23
HeatingThe type of heating system in the home.Radiant
FireplaceWhether the home has a fireplace, and what kind.Yes
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.Waterfront

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

H
Sachem High School EastB+
High · Grades 9–12 · 0.5 mi
E
Lynwood Avenue Elementary SchoolC-
Elementary · Grades KG–5 · 0.7 mi
M
Sagamore Middle SchoolB
Middle · Grades 6–8 · 2.1 mi

District: Sachem Central School District

Neighborhood · ZIP 11738These 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.36
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.65

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.16,570
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,262 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$125,315
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$152,500
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.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

121 Rosemont Ave 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.

  • Costs less per square foot than 79% of homes in Suffolk County
  • Has a smaller lot than 72% of homes in Farmingville 11738

What homes are worth in Farmingville 11738

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

This home
$369K$958K

This home is worth more than 59% of homes in Farmingville 11738.

How it measures up in Farmingville 11738

The dot is this home. The mark in the middle is the typical home in Farmingville 11738.

Estimated value$644,080
CheaperTypical $623,034Pricier

Pricier than 59% of homes nearby

Price per ft²$333
CheaperTypical $354Pricier

Pricier than 41% of homes nearby

Living area1,933 ft²
SmallerTypical 1,795 ft²Bigger

Bigger than 58% of homes nearby

Lot size0.23 ac
SmallerTypical 0.31 acBigger

Bigger than 28% of homes nearby

Year built1971
OlderTypical 1970Newer

Newer than 62% of homes nearby

How 121 Rosemont Ave ranks against every home in each area.
MeasureThis homeFarmingville 11738Suffolk County
Estimated valuepricier than$644,08059% of homes39% of homes
Price per ft²pricier than$33341% of homes21% of homes
Living areabigger than1,933 ft²58% of homes63% of homes
Lot sizebigger than0.23 ac28% of homes38% of homes
Year builtnewer than197162% of homes53% of homes

About 121 Rosemont Ave

How much is 121 Rosemont Ave, Farmingville, NY worth?

The TopHap Estimate for 121 Rosemont Ave, Farmingville, NY is $644,080 as of Sep 24, 2026. The likely range is $594,286 to $693,874. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 121 Rosemont Ave, Farmingville, NY last sell?

121 Rosemont Ave, Farmingville, NY last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 121 Rosemont Ave, Farmingville, NY?

121 Rosemont Ave, Farmingville, NY has 4 bedrooms, 2 bathrooms, 1,933 square feet of living space and a 0.23-acre lot.

When was 121 Rosemont Ave, Farmingville, NY built?

121 Rosemont Ave, Farmingville, NY was built in 1971, making it 55 years old. It is a cape cod home. The building has 1 story.

What schools serve 121 Rosemont Ave, Farmingville, NY?

121 Rosemont Ave, Farmingville, NY is assigned to Sachem High School East (high), rated B+; Lynwood Avenue Elementary School (elementary), rated C-; Sagamore Middle School (middle), rated B. All sit in Sachem Central School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 121 Rosemont Ave, Farmingville, NY compare to other homes in Farmingville 11738?

Among the 4,635 homes in Farmingville 11738, it is worth more than 59% of them ($644,080 against a typical $623,034), its price per square foot is higher than 41% of them ($333 against a typical $354), it is bigger than 58% of them (1,933 ft² against a typical 1,795 ft²), its lot is bigger than 28% of them (0.23 ac against a typical 0.31 ac) and it is newer than 62% of them (1971 against a typical 1970). Measured against all of Suffolk County, it is worth more than 39% 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 121 Rosemont Ave, Farmingville, NY?

The 2024 property tax bill for 121 Rosemont Ave, Farmingville, NY was $7,794. The county assessed it at $2,560.

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More homes in Farmingville 11738

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