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Single Family ResidenceResidential
$353,094$274 / 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 85How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $315,000 on Nov 29, 2023

21 PROSPECT ST

MARLBORO, NY 12542
3
Beds
1
Baths
1,290 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.
0.4 ac
Lot SizeThe size of the land the home sits on, from county records.
1958
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$353K
$300K low$406K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$315,000 · Nov 29, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,614 (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.$157,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$62,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$94,600
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$156,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$277,758

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.Ranch
CountyULSTER
Lot (acres)The size of the land the home sits on, from county records.0.40
HeatingThe type of heating system in the home.Hot Water
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
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.Porch · 190 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
Marlboro Middle SchoolB+
Middle · Grades 6–8 · 0.3 mi
E
Marlboro Elementary SchoolB-
Elementary · Grades KG–5 · 0.6 mi
H
Marlboro Central High SchoolB
High · Grades 9–12 · 0.7 mi

District: Marlboro Central School District

Neighborhood · ZIP 12542These 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.87
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.93
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.79

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.9%
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.5,445
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.378 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$109,512
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,236
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.46 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

21 Prospect St 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 less than 77% of homes in Marlboro 12542
  • Costs more per square foot than 78% of homes in Marlboro 12542
  • Smaller than 81% of homes in Marlboro 12542
  • Has a smaller lot than 84% of homes in Marlboro 12542
  • Older than 69% of homes in Marlboro 12542

What homes are worth in Marlboro 12542

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

This home
$237K$784K

This home is worth more than 23% of homes in Marlboro 12542.

How it measures up in Marlboro 12542

The dot is this home. The mark in the middle is the typical home in Marlboro 12542.

Estimated value$353,094
CheaperTypical $453,740Pricier

Pricier than 23% of homes nearby

Price per ft²$274
CheaperTypical $240Pricier

Pricier than 78% of homes nearby

Living area1,290 ft²
SmallerTypical 1,936 ft²Bigger

Bigger than 19% of homes nearby

Lot size0.4 ac
SmallerTypical 1.1 acBigger

Bigger than 16% of homes nearby

Year built1958
OlderTypical 1974Newer

Newer than 31% of homes nearby

How 21 Prospect St ranks against every home in each area.
MeasureThis homeMarlboro 12542Ulster County
Estimated valuepricier than$353,09423% of homes28% of homes
Price per ft²pricier than$27478% of homes48% of homes
Living areabigger than1,290 ft²19% of homes29% of homes
Lot sizebigger than0.4 ac16% of homes31% of homes
Year builtnewer than195831% of homes45% of homes

About 21 Prospect St

How much is 21 Prospect St, Marlboro, NY worth?

The TopHap Estimate for 21 Prospect St, Marlboro, NY is $353,094 as of Oct 21, 2026. The likely range is $299,764 to $406,424. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Prospect St, Marlboro, NY last sell?

21 Prospect St, Marlboro, NY last sold on Nov 29, 2023 for $315,000, according to the county's recorded deed.

How big is 21 Prospect St, Marlboro, NY?

21 Prospect St, Marlboro, NY has 3 bedrooms, 1 bathrooms, 1,290 square feet of living space and a 0.40-acre lot.

When was 21 Prospect St, Marlboro, NY built?

21 Prospect St, Marlboro, NY was built in 1958, making it 68 years old. It is a ranch home. The building has 1 story.

What schools serve 21 Prospect St, Marlboro, NY?

21 Prospect St, Marlboro, NY is assigned to Marlboro Middle School (middle), rated B+; Marlboro Elementary School (elementary), rated B-; Marlboro Central High School (high), rated B. All sit in Marlboro Central School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Prospect St, Marlboro, NY compare to other homes in Marlboro 12542?

Among the 2,347 homes in Marlboro 12542, it is worth more than 23% of them ($353,094 against a typical $453,740), its price per square foot is higher than 78% of them ($274 against a typical $240), it is bigger than 19% of them (1,290 ft² against a typical 1,936 ft²), its lot is bigger than 16% of them (0.4 ac against a typical 1.1 ac) and it is newer than 31% of them (1958 against a typical 1974). Measured against all of Ulster County, it is worth more than 28% 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 21 Prospect St, Marlboro, NY?

The 2025 property tax bill for 21 Prospect St, Marlboro, NY was $6,614. The county assessed it at $157,100.

More homes on Prospect St

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Assigned schools

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