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Single Family ResidenceResidential
$554,916$322 / 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 $407,500 on Jun 21, 2021

9 UNDERROCK RD

SPARTA, NJ 07871
0
Baths
1,722 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.
0.42 ac
Lot SizeThe size of the land the home sits on, from county records.
1951
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$555K
$527K low$582K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$407,500 · Jun 21, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,179 (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.$277,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$121,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$156,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$277,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$277,500

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.43
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
20
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
57
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
97
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
40
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
StyleThe architectural style of the home, such as ranch or colonial.Ranch
CountySUSSEX
Lot (acres)The size of the land the home sits on, from county records.0.42
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.

H
Sparta High SchoolB-
High · Grades 9–12 · 1.7 mi
M
Sparta Middle SchoolB
Middle · Grades 6–8 · 1.7 mi
E
Sparta Alpine School
Elementary · Grades PK–2 · 3.5 mi

District: Sparta Township School District

Neighborhood · ZIP 07871These 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.17
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 100.96

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.0%
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.21,461
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.530 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$163,529
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$191,626
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

9 Underrock Rd 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 76% of homes in Sussex County
  • Costs more per square foot than 70% of homes in Sussex County
  • Smaller than 68% of homes in Sparta 07871
  • Older than 77% of homes in Sussex County

What homes are worth in Sparta 07871

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

This home
$143K$1.7M

This home is worth more than 37% of homes in Sparta 07871.

How it measures up in Sparta 07871

The dot is this home. The mark in the middle is the typical home in Sparta 07871.

Estimated value$554,916
CheaperTypical $629,290Pricier

Pricier than 37% of homes nearby

Price per ft²$322
CheaperTypical $309Pricier

Pricier than 57% of homes nearby

Living area1,722 ft²
SmallerTypical 2,090 ft²Bigger

Bigger than 32% of homes nearby

Lot size0.42 ac
SmallerTypical 0.48 acBigger

Bigger than 44% of homes nearby

Year built1951
OlderTypical 1974Newer

Newer than 24% of homes nearby

How 9 Underrock Rd ranks against every home in each area.
MeasureThis homeSparta 07871Sussex County
Estimated valuepricier than$554,91637% of homes76% of homes
Price per ft²pricier than$32257% of homes70% of homes
Living areabigger than1,722 ft²32% of homes54% of homes
Lot sizebigger than0.42 ac44% of homes53% of homes
Year builtnewer than195124% of homes23% of homes

About 9 Underrock Rd

How much is 9 Underrock Rd, Sparta, NJ worth?

The TopHap Estimate for 9 Underrock Rd, Sparta, NJ is $554,916 as of Sep 24, 2026. The likely range is $527,460 to $582,372. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9 Underrock Rd, Sparta, NJ last sell?

9 Underrock Rd, Sparta, NJ last sold on Jun 21, 2021 for $407,500, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 9 Underrock Rd, Sparta, NJ?

9 Underrock Rd, Sparta, NJ has 1,722 square feet of living space and a 0.42-acre lot.

When was 9 Underrock Rd, Sparta, NJ built?

9 Underrock Rd, Sparta, NJ was built in 1951, making it 75 years old. It is a ranch home. The building has 1 story.

What schools serve 9 Underrock Rd, Sparta, NJ?

9 Underrock Rd, Sparta, NJ is assigned to Sparta High School (high), rated B-; Sparta Middle School (middle), rated B; Sparta Alpine School (elementary). All sit in Sparta Township School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9 Underrock Rd, Sparta, NJ compare to other homes in Sparta 07871?

Among the 8,328 homes in Sparta 07871, it is worth more than 37% of them ($554,916 against a typical $629,290), its price per square foot is higher than 57% of them ($322 against a typical $309), it is bigger than 32% of them (1,722 ft² against a typical 2,090 ft²), its lot is bigger than 44% of them (0.42 ac against a typical 0.48 ac) and it is newer than 24% of them (1951 against a typical 1974). Measured against all of Sussex County, it is worth more than 76% 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 9 Underrock Rd, Sparta, NJ?

The 2025 property tax bill for 9 Underrock Rd, Sparta, NJ was $10,179. The county assessed it at $277,500.

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