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Single Family ResidenceResidential
$681,739
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 91How 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 $250,000 on Feb 17, 1989

421 KOSCIUSKO AVE

SOUTH PLAINFIELD, NJ 07080
0
Baths
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$682K
$618K low$746K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$250,000 · Feb 17, 1989

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,779 (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.$161,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$40,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$121,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$161,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$161,000

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

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

E
Roosevelt Elementary SchoolC+
Elementary · Grades KG–4 · 0.3 mi
H
South Plainfield High SchoolC
High · Grades 9–12 · 1.3 mi
M
South Plainfield Middle SchoolB-
Middle · Grades 7–8 · 1.4 mi

District: South Plainfield Borough School District

Neighborhood · ZIP 07080These 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.35
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.94
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.101

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.25%
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.1.6%
PopulationHow many people live in this area.25,481
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,053 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$124,850
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$145,590
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

421 Kosciusko 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.

  • Worth more than 82% of homes in South Plainfield 07080
  • Has a bigger lot than 71% of homes in Middlesex County

What homes are worth in South Plainfield 07080

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

This home
$390K$938K

This home is worth more than 82% of homes in South Plainfield 07080.

How it measures up in South Plainfield 07080

The dot is this home. The mark in the middle is the typical home in South Plainfield 07080.

Estimated value$681,739
CheaperTypical $571,665Pricier

Pricier than 82% of homes nearby

Lot size0.23 ac
SmallerTypical 0.21 acBigger

Bigger than 57% of homes nearby

How 421 Kosciusko Ave ranks against every home in each area.
MeasureThis homeSouth Plainfield 07080Middlesex County
Estimated valuepricier than$681,73982% of homes69% of homes
Lot sizebigger than0.23 ac57% of homes71% of homes

About 421 Kosciusko Ave

How much is 421 Kosciusko Ave, South Plainfield, NJ worth?

The TopHap Estimate for 421 Kosciusko Ave, South Plainfield, NJ is $681,739 as of Sep 24, 2026. The likely range is $617,529 to $745,949. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Kosciusko Ave, South Plainfield, NJ last sell?

421 Kosciusko Ave, South Plainfield, NJ last sold on Feb 17, 1989 for $250,000, according to the county's recorded deed.

What schools serve 421 Kosciusko Ave, South Plainfield, NJ?

421 Kosciusko Ave, South Plainfield, NJ is assigned to Roosevelt Elementary School (elementary), rated C+; South Plainfield High School (high), rated C; South Plainfield Middle School (middle), rated B-. All sit in South Plainfield Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Kosciusko Ave, South Plainfield, NJ compare to other homes in South Plainfield 07080?

Among the 7,536 homes in South Plainfield 07080, it is worth more than 82% of them ($681,739 against a typical $571,665) and its lot is bigger than 57% of them (0.23 ac against a typical 0.21 ac). Measured against all of Middlesex County, it is worth more than 69% 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 421 Kosciusko Ave, South Plainfield, NJ?

The 2025 property tax bill for 421 Kosciusko Ave, South Plainfield, NJ was $11,779. The county assessed it at $161,000.

More homes on Kosciusko Ave

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Assigned schools

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