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Single Family ResidenceResidential
$1,466,740$394 / 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 78How 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 $792,850 on Dec 4, 2015

21 SAPPHIRE RD

ROBBINSVILLE, NJ 08691
0
Baths
3,727 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.
2016
Year BuiltThe year the home was originally built, according to county records.

Valuation

$1.5M
$1.1M low$1.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$792,850 · Dec 4, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$25,298 (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.$725,300 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$174,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$550,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$725,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$725,300

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMERCER
Lot (acres)The size of the land the home sits on, from county records.0.57
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
Pond Road Middle SchoolA-
Middle · Grades 5–8 · 0.9 mi
H
Robbinsville High SchoolA-
High · Grades 9–12 · 1.3 mi
E
Sharon Elementary SchoolB+
Elementary · Grades PK–4 · 3.8 mi

District: Robbinsville Public Schools

Neighborhood · ZIP 08691These 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.93
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.85

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.2.2%
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.18,463
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.761 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$144,350
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$160,153
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.48 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 Sapphire Rd 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.

  • Among the most valuable homes in Robbinsville 08691
  • Costs more per square foot than 97% of homes in Robbinsville 08691
  • Bigger than 96% of homes in Robbinsville 08691
  • Has a bigger lot than 85% of homes in Mercer County
  • Among the newest homes in Mercer County

What homes are worth in Robbinsville 08691

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

This home
$229K$1.3M

This home is worth more than almost all homes in Robbinsville 08691.

How it measures up in Robbinsville 08691

The dot is this home. The mark in the middle is the typical home in Robbinsville 08691.

Estimated value$1,466,740
CheaperTypical $585,744Pricier

Pricier than almost all homes nearby

Price per ft²$394
CheaperTypical $289Pricier

Pricier than 97% of homes nearby

Living area3,727 ft²
SmallerTypical 1,943 ft²Bigger

Bigger than 96% of homes nearby

Lot size0.57 ac
SmallerTypical 0.15 acBigger

Bigger than 69% of homes nearby

Year built2016
OlderTypical 1995Newer

Newer than 96% of homes nearby

How 21 Sapphire Rd ranks against every home in each area.
MeasureThis homeRobbinsville 08691Mercer County
Estimated valuepricier than$1,466,740almost all homes96% of homes
Price per ft²pricier than$39497% of homes88% of homes
Living areabigger than3,727 ft²96% of homes96% of homes
Lot sizebigger than0.57 ac69% of homes85% of homes
Year builtnewer than201696% of homesalmost all homes

About 21 Sapphire Rd

How much is 21 Sapphire Rd, Robbinsville, NJ worth?

The TopHap Estimate for 21 Sapphire Rd, Robbinsville, NJ is $1,466,740 as of Sep 24, 2026. The likely range is $1,139,589 to $1,793,891. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Sapphire Rd, Robbinsville, NJ last sell?

21 Sapphire Rd, Robbinsville, NJ last sold on Dec 4, 2015 for $792,850, according to the county's recorded deed.

How big is 21 Sapphire Rd, Robbinsville, NJ?

21 Sapphire Rd, Robbinsville, NJ has 3,727 square feet of living space and a 0.57-acre lot.

When was 21 Sapphire Rd, Robbinsville, NJ built?

21 Sapphire Rd, Robbinsville, NJ was built in 2016, making it 10 years old.

What schools serve 21 Sapphire Rd, Robbinsville, NJ?

21 Sapphire Rd, Robbinsville, NJ is assigned to Pond Road Middle School (middle), rated A-; Robbinsville High School (high), rated A-; Sharon Elementary School (elementary), rated B+. All sit in Robbinsville Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Sapphire Rd, Robbinsville, NJ compare to other homes in Robbinsville 08691?

Among the 5,931 homes in Robbinsville 08691, it is worth more than almost all of them ($1,466,740 against a typical $585,744), its price per square foot is higher than 97% of them ($394 against a typical $289), it is bigger than 96% of them (3,727 ft² against a typical 1,943 ft²), its lot is bigger than 69% of them (0.57 ac against a typical 0.15 ac) and it is newer than 96% of them (2016 against a typical 1995). Measured against all of Mercer County, it is worth more than 96% 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 Sapphire Rd, Robbinsville, NJ?

The 2025 property tax bill for 21 Sapphire Rd, Robbinsville, NJ was $25,298. The county assessed it at $725,300.

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