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Residential (General/Single)Residential
$1,147,149$358 / 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 $740,000 on Jul 18, 2016

21 NILSEN AVE

MAHWAH, NJ 07430
0
Baths
3,206 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.
0.57 ac
Lot SizeThe size of the land the home sits on, from county records.
1980
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$1.1M
$1M low$1.3M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$740,000 · Jul 18, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,183 (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.$666,800 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$289,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$377,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$666,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$666,800

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Residential (General/Single)
StyleThe architectural style of the home, such as ranch or colonial.Cape Cod
CountyBERGEN
Lot (acres)The size of the land the home sits on, from county records.0.57
ConstructionThe main material the home's frame and walls are built from.Stone
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

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
Betsy Ross Elementary SchoolA+
Elementary · Grades KG–3 · 1.4 mi
H
Mahwah High SchoolA-
High · Grades 9–12 · 2.3 mi
M
Ramapo RidgeB-
Middle · Grades 6–8 · 2.5 mi

District: Mahwah Township School District

Neighborhood · ZIP 07430These 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.85
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.111

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.36%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.26,174
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.981 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$120,075
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$160,495
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.51 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

21 Nilsen 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 80% of homes in Mahwah 07430
  • Costs less per square foot than 81% of homes in Bergen County
  • Bigger than 88% of homes in Bergen County
  • Has a bigger lot than 87% of homes in Bergen County
  • Newer than 78% of homes in Bergen County

What homes are worth in Mahwah 07430

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

This home
$287K$2M

This home is worth more than 80% of homes in Mahwah 07430.

How it measures up in Mahwah 07430

The dot is this home. The mark in the middle is the typical home in Mahwah 07430.

Estimated value$1,147,149
CheaperTypical $690,912Pricier

Pricier than 80% of homes nearby

Price per ft²$358
CheaperTypical $388Pricier

Pricier than 29% of homes nearby

Living area3,206 ft²
SmallerTypical 1,822 ft²Bigger

Bigger than 84% of homes nearby

Lot size0.57 ac
SmallerTypical 0.11 acBigger

Bigger than 73% of homes nearby

Year built1980
OlderTypical 1987Newer

Newer than 33% of homes nearby

How 21 Nilsen Ave ranks against every home in each area.
MeasureThis homeMahwah 07430Bergen County
Estimated valuepricier than$1,147,14980% of homes80% of homes
Price per ft²pricier than$35829% of homes19% of homes
Living areabigger than3,206 ft²84% of homes88% of homes
Lot sizebigger than0.57 ac73% of homes87% of homes
Year builtnewer than198033% of homes78% of homes

About 21 Nilsen Ave

How much is 21 Nilsen Ave, Mahwah, NJ worth?

The TopHap Estimate for 21 Nilsen Ave, Mahwah, NJ is $1,147,149 as of Sep 24, 2026. The likely range is $1,030,705 to $1,263,593. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Nilsen Ave, Mahwah, NJ last sell?

21 Nilsen Ave, Mahwah, NJ last sold on Jul 18, 2016 for $740,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 Nilsen Ave, Mahwah, NJ?

21 Nilsen Ave, Mahwah, NJ has 3,206 square feet of living space and a 0.57-acre lot.

When was 21 Nilsen Ave, Mahwah, NJ built?

21 Nilsen Ave, Mahwah, NJ was built in 1980, making it 46 years old. It is a cape cod home. The building has 1 story.

What schools serve 21 Nilsen Ave, Mahwah, NJ?

21 Nilsen Ave, Mahwah, NJ is assigned to Betsy Ross Elementary School (elementary), rated A+; Mahwah High School (high), rated A-; Ramapo Ridge (middle), rated B-. All sit in Mahwah Township School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Nilsen Ave, Mahwah, NJ compare to other homes in Mahwah 07430?

Among the 9,337 homes in Mahwah 07430, it is worth more than 80% of them ($1,147,149 against a typical $690,912), its price per square foot is higher than 29% of them ($358 against a typical $388), it is bigger than 84% of them (3,206 ft² against a typical 1,822 ft²), its lot is bigger than 73% of them (0.57 ac against a typical 0.11 ac) and it is newer than 33% of them (1980 against a typical 1987). Measured against all of Bergen County, it is worth more than 80% 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 21 Nilsen Ave, Mahwah, NJ?

The 2025 property tax bill for 21 Nilsen Ave, Mahwah, NJ was $14,183. The county assessed it at $666,800.

More homes on Nilsen Ave

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