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Single Family ResidenceResidential
$1,718,657$288 / 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 90How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $450,000 on Aug 2, 1999

20 PROSPECT ST

MENDHAM, NJ 07945
0
Baths
5,960 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.
1.4 ac
Lot SizeThe size of the land the home sits on, from county records.
1999
Year BuiltThe year the home was originally built, according to county records.

Valuation

$1.7M
$1.6M low$1.9M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$450,000 · Aug 2, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$27,060 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$1,100,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$354,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$745,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,100,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,100,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMORRIS
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.

E
Hilltop SchoolB+
Elementary · Grades PK–4 · 0.3 mi
M
Mountain View SchoolA
Middle · Grades 5–8 · 0.6 mi
H
West Morris Mendham High SchoolA+
High · Grades 9–12 · 0.8 mi

District: Mendham Borough School District

Neighborhood · ZIP 07945These 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.88
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 100.101

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.41%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.10,295
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.510 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$212,259
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$270,274
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.53 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

20 Prospect 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 96% of homes in Morris County
  • Costs less per square foot than 96% of homes in Mendham 07945
  • Among the largest homes in Morris County
  • Has a bigger lot than 90% of homes in Morris County
  • Newer than 92% of homes in Mendham 07945

What homes are worth in Mendham 07945

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

This home
$561K$2.6M

This home is worth more than 87% of homes in Mendham 07945.

How it measures up in Mendham 07945

The dot is this home. The mark in the middle is the typical home in Mendham 07945.

Estimated value$1,718,657
CheaperTypical $1,114,362Pricier

Pricier than 87% of homes nearby

Price per ft²$288
CheaperTypical $396Pricier

Pricier than 4% of homes nearby

Living area5,960 ft²
SmallerTypical 2,804 ft²Bigger

Bigger than 94% of homes nearby

Lot size1.4 ac
SmallerTypical 1.03 acBigger

Bigger than 64% of homes nearby

Year built1999
OlderTypical 1973Newer

Newer than 92% of homes nearby

How 20 Prospect St ranks against every home in each area.
MeasureThis homeMendham 07945Morris County
Estimated valuepricier than$1,718,65787% of homes96% of homes
Price per ft²pricier than$2884% of homes15% of homes
Living areabigger than5,960 ft²94% of homesalmost all homes
Lot sizebigger than1.4 ac64% of homes90% of homes
Year builtnewer than199992% of homes87% of homes

About 20 Prospect St

How much is 20 Prospect St, Mendham, NJ worth?

The TopHap Estimate for 20 Prospect St, Mendham, NJ is $1,718,657 as of Jul 14, 2026. The likely range is $1,551,322 to $1,885,992. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Prospect St, Mendham, NJ last sell?

20 Prospect St, Mendham, NJ last sold on Aug 2, 1999 for $450,000, according to the county's recorded deed.

When was 20 Prospect St, Mendham, NJ built?

20 Prospect St, Mendham, NJ was built in 1999, making it 27 years old.

What schools serve 20 Prospect St, Mendham, NJ?

20 Prospect St, Mendham, NJ is assigned to Hilltop School (elementary), rated B+; Mountain View School (middle), rated A; West Morris Mendham High School (high), rated A+. All sit in Mendham Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Prospect St, Mendham, NJ compare to other homes in Mendham 07945?

Among the 3,208 homes in Mendham 07945, it is worth more than 87% of them ($1,718,657 against a typical $1,114,362), its price per square foot is higher than 4% of them ($288 against a typical $396), it is bigger than 94% of them (5,960 ft² against a typical 2,804 ft²), its lot is bigger than 64% of them (1.4 ac against a typical 1.03 ac) and it is newer than 92% of them (1999 against a typical 1973). Measured against all of Morris 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 20 Prospect St, Mendham, NJ?

The 2024 property tax bill for 20 Prospect St, Mendham, NJ was $27,060. The county assessed it at $1,100,000.

More homes on Prospect St

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Assigned schools

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