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Single Family ResidenceResidential
$510,207$380 / 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 93How 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 $592,000 on Jun 19, 2023

306 MERCER AVE

ROSELLE, NJ 07203
0
Baths
1,344 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.
1917
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$510K
$474K low$546K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$592,000 · Jun 19, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,873 (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.$97,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$56,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$41,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$97,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$97,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyUNION
Lot (acres)The size of the land the home sits on, from county records.0.12
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

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
Harrison Elementary SchoolB-
Elementary · Grades 1–4 · 0.2 mi
H
Abraham Clark High SchoolF
High · Grades 9–12 · 0.5 mi
M
Grace Wilday Junior High SchoolD-
Middle · Grades 7–8 · 1.1 mi

District: Roselle Borough School District

Neighborhood · ZIP 07203These 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.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.113

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.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.23,141
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,867 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$83,013
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$109,446
Average tempThe average temperature here across a full year.54°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

306 Mercer 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 less than 80% of homes in Union County
  • Smaller than 75% of homes in Union County
  • Has a smaller lot than 73% of homes in Union County
  • Older than 89% of homes in Union County

What homes are worth in Roselle 07203

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

This home
$195K$744K

This home is worth more than 56% of homes in Roselle 07203.

How it measures up in Roselle 07203

The dot is this home. The mark in the middle is the typical home in Roselle 07203.

Estimated value$510,207
CheaperTypical $498,990Pricier

Pricier than 56% of homes nearby

Price per ft²$380
CheaperTypical $355Pricier

Pricier than 61% of homes nearby

Living area1,344 ft²
SmallerTypical 1,366 ft²Bigger

Bigger than 48% of homes nearby

Lot size0.11 ac
SmallerTypical 0.12 acBigger

Bigger than 32% of homes nearby

Year built1917
OlderTypical 1942Newer

Newer than 12% of homes nearby

How 306 Mercer Ave ranks against every home in each area.
MeasureThis homeRoselle 07203Union County
Estimated valuepricier than$510,20756% of homes20% of homes
Price per ft²pricier than$38061% of homes41% of homes
Living areabigger than1,344 ft²48% of homes25% of homes
Lot sizebigger than0.11 ac32% of homes27% of homes
Year builtnewer than191712% of homes11% of homes

About 306 Mercer Ave

How much is 306 Mercer Ave, Roselle, NJ worth?

The TopHap Estimate for 306 Mercer Ave, Roselle, NJ is $510,207 as of Aug 30, 2026. The likely range is $473,922 to $546,491. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 306 Mercer Ave, Roselle, NJ last sell?

306 Mercer Ave, Roselle, NJ last sold on Jun 19, 2023 for $592,000, according to the county's recorded deed.

How big is 306 Mercer Ave, Roselle, NJ?

306 Mercer Ave, Roselle, NJ has 1,344 square feet of living space and a 0.12-acre lot.

When was 306 Mercer Ave, Roselle, NJ built?

306 Mercer Ave, Roselle, NJ was built in 1917, making it 109 years old. The building has 2 stories.

What schools serve 306 Mercer Ave, Roselle, NJ?

306 Mercer Ave, Roselle, NJ is assigned to Harrison Elementary School (elementary), rated B-; Abraham Clark High School (high), rated F; Grace Wilday Junior High School (middle), rated D-. All sit in Roselle Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 306 Mercer Ave, Roselle, NJ compare to other homes in Roselle 07203?

Among the 5,320 homes in Roselle 07203, it is worth more than 56% of them ($510,207 against a typical $498,990), its price per square foot is higher than 61% of them ($380 against a typical $355), it is bigger than 48% of them (1,344 ft² against a typical 1,366 ft²), its lot is bigger than 32% of them (0.11 ac against a typical 0.12 ac) and it is newer than 12% of them (1917 against a typical 1942). Measured against all of Union County, it is worth more than 20% 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 306 Mercer Ave, Roselle, NJ?

The 2025 property tax bill for 306 Mercer Ave, Roselle, NJ was $8,873. The county assessed it at $97,000.

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Assigned schools

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