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Single Family ResidenceResidential
$662,985$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 94How 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 $486,000 on Feb 2, 2022

121 FIRTH ST

SOUTH PLAINFIELD, NJ 07080
0
Baths
2,209 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.
0.26 ac
Lot SizeThe size of the land the home sits on, from county records.
1919
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$663K
$620K low$706K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$486,000 · Feb 2, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,770 (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.$106,200 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$34,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$79,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$106,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$106,200

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.43
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
19
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
68
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
84
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
43
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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.0.26
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 SchoolC+
Middle · Grades 7–8 · 0.6 mi
H
South Plainfield High SchoolB-
High · Grades 9–12 · 0.7 mi
E
John E. Riley Elementary SchoolA
Elementary · Grades KG–4 · 0.8 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

121 Firth 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 more than 81% of homes in South Plainfield 07080
  • Costs less per square foot than 86% of homes in South Plainfield 07080
  • Bigger than 84% of homes in South Plainfield 07080
  • Has a bigger lot than 79% of homes in South Plainfield 07080
  • Older than 96% 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
$401K$924K

This home is worth more than 81% 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$662,985
CheaperTypical $566,158Pricier

Pricier than 81% of homes nearby

Price per ft²$300
CheaperTypical $358Pricier

Pricier than 14% of homes nearby

Living area2,209 ft²
SmallerTypical 1,634 ft²Bigger

Bigger than 84% of homes nearby

Lot size0.26 ac
SmallerTypical 0.21 acBigger

Bigger than 79% of homes nearby

Year built1919
OlderTypical 1961Newer

Newer than 4% of homes nearby

How 121 Firth St ranks against every home in each area.
MeasureThis homeSouth Plainfield 07080Middlesex County
Estimated valuepricier than$662,98581% of homes67% of homes
Price per ft²pricier than$30014% of homes19% of homes
Living areabigger than2,209 ft²84% of homes76% of homes
Lot sizebigger than0.26 ac79% of homes78% of homes
Year builtnewer than19194% of homes7% of homes

About 121 Firth St

How much is 121 Firth St, South Plainfield, NJ worth?

The TopHap Estimate for 121 Firth St, South Plainfield, NJ is $662,985 as of Aug 30, 2026. The likely range is $620,427 to $705,543. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 121 Firth St, South Plainfield, NJ last sell?

121 Firth St, South Plainfield, NJ last sold on Feb 2, 2022 for $486,000, according to the county's recorded deed.

How big is 121 Firth St, South Plainfield, NJ?

121 Firth St, South Plainfield, NJ has 2,209 square feet of living space and a 0.26-acre lot.

When was 121 Firth St, South Plainfield, NJ built?

121 Firth St, South Plainfield, NJ was built in 1919, making it 107 years old. The building has 2 stories.

What schools serve 121 Firth St, South Plainfield, NJ?

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

How does 121 Firth 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 81% of them ($662,985 against a typical $566,158), its price per square foot is higher than 14% of them ($300 against a typical $358), it is bigger than 84% of them (2,209 ft² against a typical 1,634 ft²), its lot is bigger than 79% of them (0.26 ac against a typical 0.21 ac) and it is newer than 4% of them (1919 against a typical 1961). Measured against all of Middlesex County, it is worth more than 67% 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 121 Firth St, South Plainfield, NJ?

The 2025 property tax bill for 121 Firth St, South Plainfield, NJ was $7,770. The county assessed it at $106,200.

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