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Single Family ResidenceResidential
$1,002,708$391 / 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 Jul 14, 2026
Last sold for $325,000 on Dec 27, 2001

6439 TOPAZ ST

RANCHO CUCAMONGA, CA 91701
4
Beds
2.5
Baths
2,565 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1987
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1M
$950K low$1.1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$325,000 · Dec 27, 2001
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$587,208
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$469,766
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.42%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$323,500
GMAC MORTGAGE LLC · recorded Aug 23, 2012
2nd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$92,000
BARRINGTON CAPITAL CORP

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,352 (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.$489,732 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$171,406
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$318,326

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.Modern
CountySAN BERNARDINO
Lot (acres)The size of the land the home sits on, from county records.0.23
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Tile
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 184 ft²Porch · 184 ft²

Transaction History(8)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Foreclosure Filings(4)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

M
Alta Loma Junior High SchoolB-
Middle · Grades 6–8 · 0.5 mi
E
Jasper Elementary SchoolB
Elementary · Grades KG–5 · 0.6 mi
H
Alta Loma High SchoolA-
High · Grades 9–12 · 1.1 mi

District: Chaffey Joint Union High School District

Neighborhood · ZIP 91701These 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.51
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.606

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.40,163
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,733 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$106,057
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$129,086
Average tempThe average temperature here across a full year.61°F
Annual precipHow much rain and melted snow falls here in a typical year.24 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.68%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.Yes

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

6439 Topaz 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 94% of homes in San Bernardino County
  • Costs less per square foot than 81% of homes in Rancho Cucamonga 91701
  • Bigger than 87% of homes in San Bernardino County
  • Has a bigger lot than 65% of homes in Rancho Cucamonga 91701
  • Newer than 66% of homes in Rancho Cucamonga 91701

What homes are worth in Rancho Cucamonga 91701

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

This home
$412K$1.5M

This home is worth more than 81% of homes in Rancho Cucamonga 91701.

How it measures up in Rancho Cucamonga 91701

The dot is this home. The mark in the middle is the typical home in Rancho Cucamonga 91701.

Estimated value$1,002,708
CheaperTypical $800,661Pricier

Pricier than 81% of homes nearby

Price per ft²$391
CheaperTypical $450Pricier

Pricier than 19% of homes nearby

Living area2,565 ft²
SmallerTypical 1,828 ft²Bigger

Bigger than 85% of homes nearby

Lot size0.23 ac
SmallerTypical 0.17 acBigger

Bigger than 65% of homes nearby

Year built1987
OlderTypical 1981Newer

Newer than 66% of homes nearby

How 6439 Topaz St ranks against every home in each area.
MeasureThis homeRancho Cucamonga 91701San Bernardino County
Estimated valuepricier than$1,002,70881% of homes94% of homes
Price per ft²pricier than$39119% of homes72% of homes
Living areabigger than2,565 ft²85% of homes87% of homes
Lot sizebigger than0.23 ac65% of homes65% of homes
Year builtnewer than198766% of homes59% of homes

About 6439 Topaz St

How much is 6439 Topaz St, Rancho Cucamonga, CA worth?

The TopHap Estimate for 6439 Topaz St, Rancho Cucamonga, CA is $1,002,708 as of Jul 14, 2026. The likely range is $950,406 to $1,055,010. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 6439 Topaz St, Rancho Cucamonga, CA last sell?

6439 Topaz St, Rancho Cucamonga, CA last sold on Dec 27, 2001 for $325,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 6439 Topaz St, Rancho Cucamonga, CA?

6439 Topaz St, Rancho Cucamonga, CA has 4 bedrooms, 2.5 bathrooms, 2,565 square feet of living space and a 0.23-acre lot.

When was 6439 Topaz St, Rancho Cucamonga, CA built?

6439 Topaz St, Rancho Cucamonga, CA was built in 1987, making it 39 years old. It is a modern home. The building has 2 stories.

What schools serve 6439 Topaz St, Rancho Cucamonga, CA?

6439 Topaz St, Rancho Cucamonga, CA is assigned to Alta Loma Junior High School (middle), rated B-; Jasper Elementary School (elementary), rated B; Alta Loma High School (high), rated A-. All sit in Chaffey Joint Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 6439 Topaz St, Rancho Cucamonga, CA compare to other homes in Rancho Cucamonga 91701?

Among the 12,002 homes in Rancho Cucamonga 91701, it is worth more than 81% of them ($1,002,708 against a typical $800,661), its price per square foot is higher than 19% of them ($391 against a typical $450), it is bigger than 85% of them (2,565 ft² against a typical 1,828 ft²), its lot is bigger than 65% of them (0.23 ac against a typical 0.17 ac) and it is newer than 66% of them (1987 against a typical 1981). Measured against all of San Bernardino County, it is worth more than 94% 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 6439 Topaz St, Rancho Cucamonga, CA?

The 2025 property tax bill for 6439 Topaz St, Rancho Cucamonga, CA was $5,352. The county assessed it at $489,732.

Closest homes

More homes in Rancho Cucamonga 91701

Assigned schools

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