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Single Family ResidenceResidential
$572,612$258 / 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 $290,000 on Jan 28, 2015

20 WILLIAM ST

FLEMINGTON, NJ 08822
0
Baths
2,216 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1820
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$573K
$544K low$602K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$290,000 · Jan 28, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,285 (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.$400,700 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$145,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$255,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$375,900
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$400,700

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyHUNTERDON
Lot (acres)The size of the land the home sits on, from county records.0.17
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(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.

H
Hunterdon Central Regional High SchoolB
High · Grades 9–12 · 0.6 mi
M
J. P. Case Middle SchoolB-
Middle · Grades 7–8 · 1.3 mi
E
Francis A. Desmares Elementary SchoolA-
Elementary · Grades KG–4 · 2.3 mi

District: Flemington-Raritan Regional School District

Neighborhood · ZIP 08822These 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.67
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
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.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.3.7%
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.31,940
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.505 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$143,862
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$179,763
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

20 William 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.

  • Costs less per square foot than 82% of homes in Flemington 08822
  • Has a smaller lot than 80% of homes in Hunterdon County
  • Among the oldest homes in Flemington 08822

What homes are worth in Flemington 08822

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

This home
$250K$1.2M

This home is worth more than 41% of homes in Flemington 08822.

How it measures up in Flemington 08822

The dot is this home. The mark in the middle is the typical home in Flemington 08822.

Estimated value$572,612
CheaperTypical $630,755Pricier

Pricier than 41% of homes nearby

Price per ft²$258
CheaperTypical $294Pricier

Pricier than 18% of homes nearby

Living area2,216 ft²
SmallerTypical 2,090 ft²Bigger

Bigger than 55% of homes nearby

Lot size0.17 ac
SmallerTypical 0.93 acBigger

Bigger than 28% of homes nearby

Year built1820
OlderTypical 1986Newer

Older than almost all homes nearby

How 20 William St ranks against every home in each area.
MeasureThis homeFlemington 08822Hunterdon County
Estimated valuepricier than$572,61241% of homes44% of homes
Price per ft²pricier than$25818% of homes24% of homes
Living areabigger than2,216 ft²55% of homes56% of homes
Lot sizebigger than0.17 ac28% of homes20% of homes
Year builtnewer than1820almost no homes2% of homes

About 20 William St

How much is 20 William St, Flemington, NJ worth?

The TopHap Estimate for 20 William St, Flemington, NJ is $572,612 as of Aug 30, 2026. The likely range is $543,590 to $601,634. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 William St, Flemington, NJ last sell?

20 William St, Flemington, NJ last sold on Jan 28, 2015 for $290,000, according to the county's recorded deed.

How big is 20 William St, Flemington, NJ?

20 William St, Flemington, NJ has 2,216 square feet of living space and a 0.17-acre lot.

When was 20 William St, Flemington, NJ built?

20 William St, Flemington, NJ was built in 1820, making it 206 years old. The building has 2 stories.

What schools serve 20 William St, Flemington, NJ?

20 William St, Flemington, NJ is assigned to Hunterdon Central Regional High School (high), rated B; J. P. Case Middle School (middle), rated B-; Francis A. Desmares Elementary School (elementary), rated A-. All sit in Flemington-Raritan Regional School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 William St, Flemington, NJ compare to other homes in Flemington 08822?

Among the 10,320 homes in Flemington 08822, it is worth more than 41% of them ($572,612 against a typical $630,755), its price per square foot is higher than 18% of them ($258 against a typical $294), it is bigger than 55% of them (2,216 ft² against a typical 2,090 ft²), its lot is bigger than 28% of them (0.17 ac against a typical 0.93 ac) and it is newer than almost none of them (1820 against a typical 1986). Measured against all of Hunterdon County, it is worth more than 44% 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 William St, Flemington, NJ?

The 2025 property tax bill for 20 William St, Flemington, NJ was $10,285. The county assessed it at $400,700.

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Assigned schools

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