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Single Family ResidenceResidential
$633,263$480 / 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 95How 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 $550,000 on Feb 20, 2024

21 PROSPECT AVE

PLAINSBORO, NJ 08536
0
Baths
1,320 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.
1927
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$633K
$604K low$663K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$550,000 · Feb 20, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,028 (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.$326,400 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$128,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$198,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$326,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$326,400

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.23
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(5)

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
Wicoff Elementary SchoolA
Elementary · Grades KG–3 · 0.4 mi
M
Community Middle SchoolA
Middle · Grades 6–8 · 0.4 mi
H
West Windsor-Plainsboro High School NorthA
High · Grades 9–12 · 0.6 mi

District: West Windsor-Plainsboro Regional School District

Neighborhood · ZIP 08536These 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.93
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.93

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.95%
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.3.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.8%
PopulationHow many people live in this area.19,591
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,507 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$127,368
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,070
Average tempThe average temperature here across a full year.53°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%

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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 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 more per square foot than 94% of homes in Plainsboro 08536
  • Smaller than 70% of homes in Middlesex County
  • Has a bigger lot than 71% of homes in Middlesex County
  • Among the oldest homes in Plainsboro 08536

What homes are worth in Plainsboro 08536

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

This home
$242K$1.8M

This home is worth more than 42% of homes in Plainsboro 08536.

How it measures up in Plainsboro 08536

The dot is this home. The mark in the middle is the typical home in Plainsboro 08536.

Estimated value$633,263
CheaperTypical $711,771Pricier

Pricier than 42% of homes nearby

Price per ft²$480
CheaperTypical $392Pricier

Pricier than 94% of homes nearby

Living area1,320 ft²
SmallerTypical 1,844 ft²Bigger

Bigger than 37% of homes nearby

Lot size0.23 ac
SmallerTypical 1,525 ft²Bigger

Bigger than 63% of homes nearby

Year built1927
OlderTypical 1986Newer

Older than almost all homes nearby

How 21 Prospect Ave ranks against every home in each area.
MeasureThis homePlainsboro 08536Middlesex County
Estimated valuepricier than$633,26342% of homes61% of homes
Price per ft²pricier than$48094% of homes91% of homes
Living areabigger than1,320 ft²37% of homes30% of homes
Lot sizebigger than0.23 ac63% of homes71% of homes
Year builtnewer than1927almost no homes11% of homes

About 21 Prospect Ave

How much is 21 Prospect Ave, Plainsboro, NJ worth?

The TopHap Estimate for 21 Prospect Ave, Plainsboro, NJ is $633,263 as of Aug 30, 2026. The likely range is $603,603 to $662,923. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Prospect Ave, Plainsboro, NJ last sell?

21 Prospect Ave, Plainsboro, NJ last sold on Feb 20, 2024 for $550,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 21 Prospect Ave, Plainsboro, NJ?

21 Prospect Ave, Plainsboro, NJ has 1,320 square feet of living space and a 0.23-acre lot.

When was 21 Prospect Ave, Plainsboro, NJ built?

21 Prospect Ave, Plainsboro, NJ was built in 1927, making it 99 years old. The building has 2 stories.

What schools serve 21 Prospect Ave, Plainsboro, NJ?

21 Prospect Ave, Plainsboro, NJ is assigned to Wicoff Elementary School (elementary), rated A; Community Middle School (middle), rated A; West Windsor-Plainsboro High School North (high), rated A. All sit in West Windsor-Plainsboro Regional School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Prospect Ave, Plainsboro, NJ compare to other homes in Plainsboro 08536?

Among the 4,710 homes in Plainsboro 08536, it is worth more than 42% of them ($633,263 against a typical $711,771), its price per square foot is higher than 94% of them ($480 against a typical $392), it is bigger than 37% of them (1,320 ft² against a typical 1,844 ft²), its lot is bigger than 63% of them (0.23 ac against a typical 1,525 ft²) and it is newer than almost none of them (1927 against a typical 1986). Measured against all of Middlesex County, it is worth more than 61% 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 Ave, Plainsboro, NJ?

The 2025 property tax bill for 21 Prospect Ave, Plainsboro, NJ was $9,028. The county assessed it at $326,400.

More homes on Prospect Ave

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More homes in Plainsboro 08536

Assigned schools

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