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Single Family ResidenceResidential
$579,856
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 94How 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 $269,000 on Nov 6, 2013

21 HART PL

UNION, NJ 07083
0
Baths
0.13 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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$580K
$545K low$614K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$269,000 · Nov 6, 2013

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,609 (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.$41,200 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$20,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$21,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$41,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$41,200

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
CountyUNION
Lot (acres)The size of the land the home sits on, from county records.0.13
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

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.

H
Union High SchoolD
High · Grades 9–12 · 0.7 mi
E
Hannah Caldwell Elementary SchoolD+
Elementary · Grades PK–4 · 0.8 mi
M
Burnet Middle SchoolC-
Middle · Grades 6–8 · 1.1 mi

District: Union Township School District

Neighborhood · ZIP 07083These 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.69
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 100.111

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.57,241
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.6,577 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$114,741
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,270
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 Hart Pl 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 65% of homes in Union County
  • Newer than 74% of homes in Union 07083

What homes are worth in Union 07083

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

This home
$312K$870K

This home is worth more than 47% of homes in Union 07083.

How it measures up in Union 07083

The dot is this home. The mark in the middle is the typical home in Union 07083.

Estimated value$579,856
CheaperTypical $587,050Pricier

Pricier than 47% of homes nearby

Lot size0.13 ac
SmallerTypical 0.13 acBigger

Bigger than 52% of homes nearby

Year built1958
OlderTypical 1950Newer

Newer than 74% of homes nearby

How 21 Hart Pl ranks against every home in each area.
MeasureThis homeUnion 07083Union County
Estimated valuepricier than$579,85647% of homes35% of homes
Lot sizebigger than0.13 ac52% of homes41% of homes
Year builtnewer than195874% of homes70% of homes

About 21 Hart Pl

How much is 21 Hart Pl, Union, NJ worth?

The TopHap Estimate for 21 Hart Pl, Union, NJ is $579,856 as of Oct 21, 2026. The likely range is $545,281 to $614,431. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Hart Pl, Union, NJ last sell?

21 Hart Pl, Union, NJ last sold on Nov 6, 2013 for $269,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

When was 21 Hart Pl, Union, NJ built?

21 Hart Pl, Union, NJ was built in 1958, making it 68 years old. It is a cape cod home. The building has 1 story.

What schools serve 21 Hart Pl, Union, NJ?

21 Hart Pl, Union, NJ is assigned to Union High School (high), rated D; Hannah Caldwell Elementary School (elementary), rated D+; Burnet Middle School (middle), rated C-. All sit in Union Township School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Hart Pl, Union, NJ compare to other homes in Union 07083?

Among the 15,572 homes in Union 07083, it is worth more than 47% of them ($579,856 against a typical $587,050), its lot is bigger than 52% of them (0.13 ac against a typical 0.13 ac) and it is newer than 74% of them (1958 against a typical 1950). Measured against all of Union County, it is worth more than 35% 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 Hart Pl, Union, NJ?

The 2025 property tax bill for 21 Hart Pl, Union, NJ was $9,609. The county assessed it at $41,200.

More homes on Hart Pl

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Assigned schools

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