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Single Family ResidenceResidential
$2,111,942$490 / 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 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $651,500 on Jan 13, 2000

31 AIR CASTLE ISLE

ANDOVER, NJ 07821
0
Baths
4,308 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.
0.26 ac
Lot SizeThe size of the land the home sits on, from county records.
1972
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$2.1M
$1.9M low$2.3M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$651,500 · Jan 13, 2000

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$32,180 (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.$1,453,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$575,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$877,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,453,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,453,500

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.28
98
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
16
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
30
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.111 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.1 percent flood zone

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
CountySUSSEX
Lot (acres)The size of the land the home sits on, from county records.0.26
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(5)

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
Hudson Maxim Elementary School
Elementary · Grades PK–1 · 1.3 mi
H
Hopatcong High SchoolD
High · Grades 9–12 · 3.1 mi
M
Hopatcong Middle SchoolD+
Middle · Grades 6–8 · 3.5 mi

District: Hopatcong Borough School District

Neighborhood · ZIP 07821These 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.69
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.90
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.90%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.3%
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.11,080
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.246 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$129,971
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$159,119
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.50 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

31 Air Castle Isle 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 Andover 07821
  • Costs more per square foot than 96% of homes in Andover 07821
  • Bigger than 98% of homes in Sussex County
  • Has a smaller lot than 76% of homes in Andover 07821

What homes are worth in Andover 07821

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

This home
$167K$1M

This home is worth more than almost all homes in Andover 07821.

How it measures up in Andover 07821

The dot is this home. The mark in the middle is the typical home in Andover 07821.

Estimated value$2,111,942
CheaperTypical $484,160Pricier

Pricier than almost all homes nearby

Price per ft²$490
CheaperTypical $275Pricier

Pricier than 96% of homes nearby

Living area4,308 ft²
SmallerTypical 1,856 ft²Bigger

Bigger than 97% of homes nearby

Lot size0.26 ac
SmallerTypical 0.5 acBigger

Bigger than 24% of homes nearby

Year built1972
OlderTypical 1973Newer

Newer than 49% of homes nearby

How 31 Air Castle Isle ranks against every home in each area.
MeasureThis homeAndover 07821Sussex County
Estimated valuepricier than$2,111,942almost all homesalmost all homes
Price per ft²pricier than$49096% of homes95% of homes
Living areabigger than4,308 ft²97% of homes98% of homes
Lot sizebigger than0.26 ac24% of homes36% of homes
Year builtnewer than197249% of homes51% of homes

About 31 Air Castle Isle

How much is 31 Air Castle Isle, Andover, NJ worth?

The TopHap Estimate for 31 Air Castle Isle, Andover, NJ is $2,111,942 as of Oct 21, 2026. The likely range is $1,948,344 to $2,275,540. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 31 Air Castle Isle, Andover, NJ last sell?

31 Air Castle Isle, Andover, NJ last sold on Jan 13, 2000 for $651,500, according to the county's recorded deed.

How big is 31 Air Castle Isle, Andover, NJ?

31 Air Castle Isle, Andover, NJ has 4,308 square feet of living space and a 0.26-acre lot.

When was 31 Air Castle Isle, Andover, NJ built?

31 Air Castle Isle, Andover, NJ was built in 1972, making it 54 years old. The building has 1 story.

What schools serve 31 Air Castle Isle, Andover, NJ?

31 Air Castle Isle, Andover, NJ is assigned to Hudson Maxim Elementary School (elementary); Hopatcong High School (high), rated D; Hopatcong Middle School (middle), rated D+. All sit in Hopatcong Borough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 31 Air Castle Isle, Andover, NJ compare to other homes in Andover 07821?

Among the 3,740 homes in Andover 07821, it is worth more than almost all of them ($2,111,942 against a typical $484,160), its price per square foot is higher than 96% of them ($490 against a typical $275), it is bigger than 97% of them (4,308 ft² against a typical 1,856 ft²), its lot is bigger than 24% of them (0.26 ac against a typical 0.5 ac) and it is newer than 49% of them (1972 against a typical 1973). Measured against all of Sussex 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 31 Air Castle Isle, Andover, NJ?

The 2025 property tax bill for 31 Air Castle Isle, Andover, NJ was $32,180. The county assessed it at $1,453,500.

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