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Single Family ResidenceResidential
$994,960$317 / 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 Sep 24, 2026
Last sold for $485,000 on Sep 1, 2016

40 UNION ST

PRINCETON, NJ 08540
0
Baths
3,143 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.
0.39 ac
Lot SizeThe size of the land the home sits on, from county records.
1990
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$995K
$944K low$1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$485,000 · Sep 1, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,985 (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.$868,200 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$317,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$551,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$694,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$868,200

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.45
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
22
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
67
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
95
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
43
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.minimal

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
CountySOMERSET
Lot (acres)The size of the land the home sits on, from county records.0.39
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
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
Claremont Elementary SchoolC-
Elementary · Grades PK–5 · 5.5 mi
M
Franklin Middle School @ Sampson G. Smith CampusC-
Middle · Grades 6–8 · 9.4 mi
H
Franklin High SchoolD+
High · Grades 9–12 · 10.2 mi

District: Franklin Township School District

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%

Owner Tools

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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

40 Union 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 80% of homes in Somerset County
  • Costs less per square foot than 91% of homes in Princeton 08540
  • Bigger than 85% of homes in Somerset County
  • Newer than 71% of homes in Somerset 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
$284K$3.3M

This home is worth more than 49% 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$994,960
CheaperTypical $1,007,771Pricier

Pricier than 49% of homes nearby

Price per ft²$317
CheaperTypical $429Pricier

Pricier than 9% of homes nearby

Living area3,143 ft²
SmallerTypical 2,246 ft²Bigger

Bigger than 76% of homes nearby

Lot size0.39 ac
SmallerTypical 0.28 acBigger

Bigger than 56% of homes nearby

Year built1990
OlderTypical 1986Newer

Newer than 62% of homes nearby

How 40 Union St ranks against every home in each area.
MeasureThis homePrinceton 08540Somerset County
Estimated valuepricier than$994,96049% of homes80% of homes
Price per ft²pricier than$3179% of homes28% of homes
Living areabigger than3,143 ft²76% of homes85% of homes
Lot sizebigger than0.39 ac56% of homes59% of homes
Year builtnewer than199062% of homes71% of homes

About 40 Union St

How much is 40 Union St, Princeton, NJ worth?

The TopHap Estimate for 40 Union St, Princeton, NJ is $994,960 as of Sep 24, 2026. The likely range is $944,219 to $1,045,701. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 40 Union St, Princeton, NJ last sell?

40 Union St, Princeton, NJ last sold on Sep 1, 2016 for $485,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 40 Union St, Princeton, NJ?

40 Union St, Princeton, NJ has 3,143 square feet of living space and a 0.39-acre lot.

When was 40 Union St, Princeton, NJ built?

40 Union St, Princeton, NJ was built in 1990, making it 36 years old. The building has 1 story.

What schools serve 40 Union St, Princeton, NJ?

40 Union St, Princeton, NJ is assigned to Claremont Elementary School (elementary), rated C-; Franklin Middle School @ Sampson G. Smith Campus (middle), rated C-; Franklin High School (high), rated D+. All sit in Franklin Township School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 40 Union St, Princeton, NJ compare to other homes in Princeton 08540?

Among the 13,780 homes in Princeton 08540, it is worth more than 49% of them ($994,960 against a typical $1,007,771), its price per square foot is higher than 9% of them ($317 against a typical $429), it is bigger than 76% of them (3,143 ft² against a typical 2,246 ft²), its lot is bigger than 56% of them (0.39 ac against a typical 0.28 ac) and it is newer than 62% of them (1990 against a typical 1986). Measured against all of Somerset 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 40 Union St, Princeton, NJ?

The 2025 property tax bill for 40 Union St, Princeton, NJ was $14,985. The county assessed it at $868,200.

More homes on Union St

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Assigned schools

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