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Single Family ResidenceResidential
$648,715$353 / 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 88How 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 $289,900 on May 23, 2001

139 MOUNTAIN AVE

PISCATAWAY, NJ 08854
0
Baths
1,840 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.
0.15 ac
Lot SizeThe size of the land the home sits on, from county records.
1973
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$649K
$573K low$724K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$289,900 · May 23, 2001

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,089 (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.$531,100 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$286,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$244,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$511,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$531,100

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.0.15
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(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.

E
Grandview Elementary SchoolC
Elementary · Grades KG–3 · 0.5 mi
M
T. Schor Middle SchoolB-
Middle · Grades 6–8 · 0.9 mi
H
Piscataway High SchoolC
High · Grades 9–12 · 1.5 mi

District: Piscataway Township School District

Neighborhood · ZIP 08854These 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.57
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.95
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.103

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.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.1%
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.63,382
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,298 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$116,616
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$138,705
Average tempThe average temperature here across a full year.52°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

139 Mountain 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 65% of homes in Piscataway 08854
  • Has a smaller lot than 71% of homes in Piscataway 08854

What homes are worth in Piscataway 08854

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

This home
$345K$1M

This home is worth more than 65% of homes in Piscataway 08854.

How it measures up in Piscataway 08854

The dot is this home. The mark in the middle is the typical home in Piscataway 08854.

Estimated value$648,715
CheaperTypical $586,036Pricier

Pricier than 65% of homes nearby

Price per ft²$353
CheaperTypical $357Pricier

Pricier than 46% of homes nearby

Living area1,840 ft²
SmallerTypical 1,621 ft²Bigger

Bigger than 64% of homes nearby

Lot size0.15 ac
SmallerTypical 0.23 acBigger

Bigger than 29% of homes nearby

Year built1973
OlderTypical 1973Newer

Newer than 50% of homes nearby

How 139 Mountain Ave ranks against every home in each area.
MeasureThis homePiscataway 08854Middlesex County
Estimated valuepricier than$648,71565% of homes64% of homes
Price per ft²pricier than$35346% of homes46% of homes
Living areabigger than1,840 ft²64% of homes62% of homes
Lot sizebigger than0.15 ac29% of homes49% of homes
Year builtnewer than197350% of homes55% of homes

About 139 Mountain Ave

How much is 139 Mountain Ave, Piscataway, NJ worth?

The TopHap Estimate for 139 Mountain Ave, Piscataway, NJ is $648,715 as of Sep 24, 2026. The likely range is $572,970 to $724,460. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 139 Mountain Ave, Piscataway, NJ last sell?

139 Mountain Ave, Piscataway, NJ last sold on May 23, 2001 for $289,900, according to the county's recorded deed.

How big is 139 Mountain Ave, Piscataway, NJ?

139 Mountain Ave, Piscataway, NJ has 1,840 square feet of living space and a 0.15-acre lot.

When was 139 Mountain Ave, Piscataway, NJ built?

139 Mountain Ave, Piscataway, NJ was built in 1973, making it 53 years old. The building has 2 stories.

What schools serve 139 Mountain Ave, Piscataway, NJ?

139 Mountain Ave, Piscataway, NJ is assigned to Grandview Elementary School (elementary), rated C; T. Schor Middle School (middle), rated B-; Piscataway High School (high), rated C. All sit in Piscataway Township School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 139 Mountain Ave, Piscataway, NJ compare to other homes in Piscataway 08854?

Among the 13,708 homes in Piscataway 08854, it is worth more than 65% of them ($648,715 against a typical $586,036), its price per square foot is higher than 46% of them ($353 against a typical $357), it is bigger than 64% of them (1,840 ft² against a typical 1,621 ft²), its lot is bigger than 29% of them (0.15 ac against a typical 0.23 ac) and it is newer than 50% of them (1973 against a typical 1973). Measured against all of Middlesex County, it is worth more than 64% 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 139 Mountain Ave, Piscataway, NJ?

The 2025 property tax bill for 139 Mountain Ave, Piscataway, NJ was $9,089. The county assessed it at $531,100.

More homes on Mountain Ave

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Assigned schools

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