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Single Family ResidenceResidential
$505,926$393 / 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 94How 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

323 MILL ST

SOUTH PLAINFIELD, NJ 07080
0
Baths
1,286 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1929
Year BuiltThe year the home was originally built, according to county records.

Valuation

$506K
$474K low$538K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,977 (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.$81,700 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$24,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$56,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$81,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$81,700

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.12 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.0.2 percent flood zone

Scores 0–100; higher = greater projected risk.

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.0.12
PoolWhether the property has a pool, and what kind, such as in-ground.No

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
South Plainfield Middle SchoolB-
Middle · Grades 7–8 · 0.6 mi
H
South Plainfield High SchoolC
High · Grades 9–12 · 0.6 mi
E
John E. Riley Elementary SchoolC+
Elementary · Grades KG–4 · 1.1 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

323 Mill 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 74% of homes in South Plainfield 07080
  • Costs more per square foot than 70% of homes in South Plainfield 07080
  • Smaller than 77% of homes in South Plainfield 07080
  • Has a smaller lot than 90% of homes in South Plainfield 07080
  • Older than 90% of homes in South Plainfield 07080

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 26% 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$505,926
CheaperTypical $571,665Pricier

Pricier than 26% of homes nearby

Price per ft²$393
CheaperTypical $361Pricier

Pricier than 70% of homes nearby

Living area1,286 ft²
SmallerTypical 1,641 ft²Bigger

Bigger than 23% of homes nearby

Lot size0.11 ac
SmallerTypical 0.21 acBigger

Bigger than 10% of homes nearby

Year built1929
OlderTypical 1961Newer

Newer than 10% of homes nearby

How 323 Mill St ranks against every home in each area.
MeasureThis homeSouth Plainfield 07080Middlesex County
Estimated valuepricier than$505,92626% of homes32% of homes
Price per ft²pricier than$39370% of homes68% of homes
Living areabigger than1,286 ft²23% of homes28% of homes
Lot sizebigger than0.11 ac10% of homes32% of homes
Year builtnewer than192910% of homes12% of homes

About 323 Mill St

How much is 323 Mill St, South Plainfield, NJ worth?

The TopHap Estimate for 323 Mill St, South Plainfield, NJ is $505,926 as of Sep 24, 2026. The likely range is $474,179 to $537,673. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 323 Mill St, South Plainfield, NJ last sell?

323 Mill St, South Plainfield, NJ last sold on Aug 12, 2021, according to the county's recorded deed.

How big is 323 Mill St, South Plainfield, NJ?

323 Mill St, South Plainfield, NJ has 1,286 square feet of living space and a 0.12-acre lot.

When was 323 Mill St, South Plainfield, NJ built?

323 Mill St, South Plainfield, NJ was built in 1929, making it 97 years old.

What schools serve 323 Mill St, South Plainfield, NJ?

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

How does 323 Mill St, 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 26% of them ($505,926 against a typical $571,665), its price per square foot is higher than 70% of them ($393 against a typical $361), it is bigger than 23% of them (1,286 ft² against a typical 1,641 ft²), its lot is bigger than 10% of them (0.11 ac against a typical 0.21 ac) and it is newer than 10% of them (1929 against a typical 1961). Measured against all of Middlesex County, it is worth more than 32% 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 323 Mill St, South Plainfield, NJ?

The 2025 property tax bill for 323 Mill St, South Plainfield, NJ was $5,977. The county assessed it at $81,700.

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