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Single Family ResidenceResidential
$650,089$356 / 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 89How 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

21 WILLIAMS ST

ROSELLE PARK, NJ 07204
0
Baths
1,825 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.
0.22 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$650K
$582K low$718K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,792 (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.$217,300 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$80,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$136,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$217,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$217,300

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.8 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.1 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
StyleThe architectural style of the home, such as ranch or colonial.Cape Cod
CountyUNION
Lot (acres)The size of the land the home sits on, from county records.0.22
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
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
Roselle Park Middle SchoolC
Middle · Grades 6–8 · 0.2 mi
E
Robert Gordon Elementary SchoolC-
Elementary · Grades PK–5 · 0.2 mi
H
Roselle Park High SchoolC-
High · Grades 9–12 · 0.5 mi

District: Roselle Park Borough School District

Neighborhood · ZIP 07204These 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.81
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.109

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.26%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.8%
PopulationHow many people live in this area.14,215
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.11,542 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$95,523
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$128,639
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

21 Williams 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 84% of homes in Roselle Park 07204
  • Costs less per square foot than 67% of homes in Union County
  • Bigger than 72% of homes in Roselle Park 07204
  • Has a bigger lot than 94% of homes in Roselle Park 07204
  • Newer than 77% of homes in Roselle Park 07204

What homes are worth in Roselle Park 07204

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

This home
$277K$866K

This home is worth more than 84% of homes in Roselle Park 07204.

How it measures up in Roselle Park 07204

The dot is this home. The mark in the middle is the typical home in Roselle Park 07204.

Estimated value$650,089
CheaperTypical $565,791Pricier

Pricier than 84% of homes nearby

Price per ft²$356
CheaperTypical $358Pricier

Pricier than 49% of homes nearby

Living area1,825 ft²
SmallerTypical 1,564 ft²Bigger

Bigger than 72% of homes nearby

Lot size0.22 ac
SmallerTypical 0.11 acBigger

Bigger than 94% of homes nearby

Year built1950
OlderTypical 1930Newer

Newer than 77% of homes nearby

How 21 Williams St ranks against every home in each area.
MeasureThis homeRoselle Park 07204Union County
Estimated valuepricier than$650,08984% of homes50% of homes
Price per ft²pricier than$35649% of homes33% of homes
Living areabigger than1,825 ft²72% of homes53% of homes
Lot sizebigger than0.22 ac94% of homes72% of homes
Year builtnewer than195077% of homes51% of homes

About 21 Williams St

How much is 21 Williams St, Roselle Park, NJ worth?

The TopHap Estimate for 21 Williams St, Roselle Park, NJ is $650,089 as of Sep 24, 2026. The likely range is $581,814 to $718,364. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Williams St, Roselle Park, NJ last sell?

21 Williams St, Roselle Park, NJ last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Williams St, Roselle Park, NJ?

21 Williams St, Roselle Park, NJ has 1,825 square feet of living space and a 0.22-acre lot.

When was 21 Williams St, Roselle Park, NJ built?

21 Williams St, Roselle Park, NJ was built in 1950, making it 76 years old. It is a cape cod home. The building has 1 story.

What schools serve 21 Williams St, Roselle Park, NJ?

21 Williams St, Roselle Park, NJ is assigned to Roselle Park Middle School (middle), rated C; Robert Gordon Elementary School (elementary), rated C-; Roselle Park High School (high), rated C-. All sit in Roselle Park Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Williams St, Roselle Park, NJ compare to other homes in Roselle Park 07204?

Among the 3,363 homes in Roselle Park 07204, it is worth more than 84% of them ($650,089 against a typical $565,791), its price per square foot is higher than 49% of them ($356 against a typical $358), it is bigger than 72% of them (1,825 ft² against a typical 1,564 ft²), its lot is bigger than 94% of them (0.22 ac against a typical 0.11 ac) and it is newer than 77% of them (1950 against a typical 1930). Measured against all of Union County, it is worth more than 50% 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 Williams St, Roselle Park, NJ?

The 2025 property tax bill for 21 Williams St, Roselle Park, NJ was $9,792. The county assessed it at $217,300.

More homes on Williams St

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