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Single Family ResidenceResidential
$500,814$300 / 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 90How 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 $135,000 on Nov 20, 1998

18 UNION AVE

SOUTH RIVER, NJ 08882
0
Baths
1,668 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.
3,999 ft²
Lot SizeThe size of the land the home sits on, from county records.
1920
Year BuiltThe year the home was originally built, according to county records.

Valuation

$501K
$453K low$549K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$135,000 · Nov 20, 1998

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,388 (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.$276,800 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$120,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$156,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$276,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$276,800

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.0.09
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.

M
South River Middle SchoolC-
Middle · Grades 6–8 · 0.4 mi
H
South River High SchoolD
High · Grades 9–12 · 0.5 mi
E
South River Primary School
Elementary · Grades KG–2 · 0.6 mi

District: South River Borough School District

Neighborhood · ZIP 08882These 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.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.98
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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.17%
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.1.6%
PopulationHow many people live in this area.16,718
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,569 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$86,286
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$125,749
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

18 Union 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 less than 69% of homes in Middlesex County
  • Costs less per square foot than 82% of homes in Middlesex County
  • Has a smaller lot than 88% of homes in South River 08882
  • Older than 92% of homes in Middlesex County

What homes are worth in South River 08882

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

This home
$343K$939K

This home is worth more than 38% of homes in South River 08882.

How it measures up in South River 08882

The dot is this home. The mark in the middle is the typical home in South River 08882.

Estimated value$500,814
CheaperTypical $529,418Pricier

Pricier than 38% of homes nearby

Price per ft²$300
CheaperTypical $342Pricier

Pricier than 19% of homes nearby

Living area1,668 ft²
SmallerTypical 1,552 ft²Bigger

Bigger than 59% of homes nearby

Lot size3,999 ft²
SmallerTypical 0.14 acBigger

Bigger than 12% of homes nearby

Year built1920
OlderTypical 1950Newer

Newer than 21% of homes nearby

How 18 Union Ave ranks against every home in each area.
MeasureThis homeSouth River 08882Middlesex County
Estimated valuepricier than$500,81438% of homes31% of homes
Price per ft²pricier than$30019% of homes18% of homes
Living areabigger than1,668 ft²59% of homes53% of homes
Lot sizebigger than3,999 ft²12% of homes28% of homes
Year builtnewer than192021% of homes8% of homes

About 18 Union Ave

How much is 18 Union Ave, South River, NJ worth?

The TopHap Estimate for 18 Union Ave, South River, NJ is $500,814 as of Sep 24, 2026. The likely range is $453,053 to $548,575. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Union Ave, South River, NJ last sell?

18 Union Ave, South River, NJ last sold on Nov 20, 1998 for $135,000, according to the county's recorded deed.

How big is 18 Union Ave, South River, NJ?

18 Union Ave, South River, NJ has 1,668 square feet of living space and a 0.09-acre lot.

When was 18 Union Ave, South River, NJ built?

18 Union Ave, South River, NJ was built in 1920, making it 106 years old.

What schools serve 18 Union Ave, South River, NJ?

18 Union Ave, South River, NJ is assigned to South River Middle School (middle), rated C-; South River High School (high), rated D; South River Primary School (elementary). All sit in South River Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18 Union Ave, South River, NJ compare to other homes in South River 08882?

Among the 4,333 homes in South River 08882, it is worth more than 38% of them ($500,814 against a typical $529,418), its price per square foot is higher than 19% of them ($300 against a typical $342), it is bigger than 59% of them (1,668 ft² against a typical 1,552 ft²), its lot is bigger than 12% of them (3,999 ft² against a typical 0.14 ac) and it is newer than 21% of them (1920 against a typical 1950). Measured against all of Middlesex County, it is worth more than 31% 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 18 Union Ave, South River, NJ?

The 2025 property tax bill for 18 Union Ave, South River, NJ was $7,388. The county assessed it at $276,800.

More homes on Union Ave

Closest homes

More homes in South River 08882

Assigned schools

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