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Single Family ResidenceResidential
$3,205,168$843 / 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 95How 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 $1,999,000 on Dec 10, 2015

686 PROSPECT AVE

PRINCETON, NJ 08540
0
Baths
3,804 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.
0.43 ac
Lot SizeThe size of the land the home sits on, from county records.
2015
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$3.2M
$3M low$3.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,999,000 · Dec 10, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$45,125 (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.$1,651,100 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$536,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,115,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,651,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,651,100

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.0.43
ConstructionThe main material the home's frame and walls are built from.Concrete Blocks
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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
Riverside Elementary SchoolA
Elementary · Grades PK–5 · 0.7 mi
M
Princeton Middle SchoolA+
Middle · Grades 6–8 · 1.4 mi
H
Princeton High SchoolA-
High · Grades 9–12 · 1.5 mi

District: Princeton Public Schools

Neighborhood · ZIP 08540These 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.65
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.94
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.92

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.53,074
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,031 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$158,898
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$213,931
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

686 Prospect 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.

  • Among the most valuable homes in Mercer County
  • Among the highest price per square foot in Mercer County
  • Bigger than 97% of homes in Mercer County
  • Has a bigger lot than 77% of homes in Mercer County
  • Newer than 98% of homes in Mercer County

What homes are worth in Princeton 08540

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

This home
$298K$3.3M

This home is worth more than 98% of homes in Princeton 08540.

How it measures up in Princeton 08540

The dot is this home. The mark in the middle is the typical home in Princeton 08540.

Estimated value$3,205,168
CheaperTypical $1,000,183Pricier

Pricier than 98% of homes nearby

Price per ft²$843
CheaperTypical $426Pricier

Pricier than 98% of homes nearby

Living area3,804 ft²
SmallerTypical 2,258 ft²Bigger

Bigger than 86% of homes nearby

Lot size0.43 ac
SmallerTypical 0.27 acBigger

Bigger than 57% of homes nearby

Year built2015
OlderTypical 1986Newer

Newer than 97% of homes nearby

How 686 Prospect Ave ranks against every home in each area.
MeasureThis homePrinceton 08540Mercer County
Estimated valuepricier than$3,205,16898% of homesalmost all homes
Price per ft²pricier than$84398% of homesalmost all homes
Living areabigger than3,804 ft²86% of homes97% of homes
Lot sizebigger than0.43 ac57% of homes77% of homes
Year builtnewer than201597% of homes98% of homes

About 686 Prospect Ave

How much is 686 Prospect Ave, Princeton, NJ worth?

The TopHap Estimate for 686 Prospect Ave, Princeton, NJ is $3,205,168 as of Aug 30, 2026. The likely range is $3,040,420 to $3,369,916. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 686 Prospect Ave, Princeton, NJ last sell?

686 Prospect Ave, Princeton, NJ last sold on Dec 10, 2015 for $1,999,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 686 Prospect Ave, Princeton, NJ?

686 Prospect Ave, Princeton, NJ has 3,804 square feet of living space and a 0.43-acre lot.

When was 686 Prospect Ave, Princeton, NJ built?

686 Prospect Ave, Princeton, NJ was built in 2015, making it 11 years old. The building has 2 stories.

What schools serve 686 Prospect Ave, Princeton, NJ?

686 Prospect Ave, Princeton, NJ is assigned to Riverside Elementary School (elementary), rated A; Princeton Middle School (middle), rated A+; Princeton High School (high), rated A-. All sit in Princeton Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 686 Prospect Ave, Princeton, NJ compare to other homes in Princeton 08540?

Among the 13,780 homes in Princeton 08540, it is worth more than 98% of them ($3,205,168 against a typical $1,000,183), its price per square foot is higher than 98% of them ($843 against a typical $426), it is bigger than 86% of them (3,804 ft² against a typical 2,258 ft²), its lot is bigger than 57% of them (0.43 ac against a typical 0.27 ac) and it is newer than 97% of them (2015 against a typical 1986). Measured against all of Mercer County, it is worth more than almost all 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 686 Prospect Ave, Princeton, NJ?

The 2025 property tax bill for 686 Prospect Ave, Princeton, NJ was $45,125. The county assessed it at $1,651,100.

More homes on Prospect Ave

Closest homes

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Assigned schools

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