Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$588,107$496 / 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 $658,000 on Jan 7, 2005

6639 MOUNT DIABLO AVE

RIVERSIDE, CA 92506
3
Beds
1.8
Baths
1,186 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1952
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$588K
$561K low$615K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$658,000 · Jan 7, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,557 (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.$511,815 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$143,802
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$368,013
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$501,781
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$448,830

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyRIVERSIDE
Lot (acres)The size of the land the home sits on, from county records.0.20
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Rock / Gravel
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, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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
Pachappa Elementary SchoolB-
Elementary · Grades KG–6 · 0.6 mi
H
Poly High SchoolB
High · Grades 9–12 · 1.3 mi
M
Central Middle School of Arts and InnovationC-
Middle · Grades 7–8 · 1.7 mi

District: Riverside Unified School District

Neighborhood · ZIP 92506These 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.65
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.350

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.22%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.4%
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.47,695
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,910 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$109,200
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$137,774
Average tempThe average temperature here across a full year.64°F
Annual precipHow much rain and melted snow falls here in a typical year.11 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.68%

Owner Tools

Do you own this home?
Claim this home

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

6639 Mount Diablo Ave 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 less than 75% of homes in Riverside 92506
  • Costs more per square foot than 93% of homes in Riverside County
  • Smaller than 85% of homes in Riverside 92506
  • Has a bigger lot than 73% of homes in Magnolia Center
  • Older than 95% of homes in Riverside County

What homes are worth in Riverside 92506

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

This home
$412K$1.8M

This home is worth more than 25% of homes in Riverside 92506.

How it measures up in Riverside 92506

The dot is this home. The mark in the middle is the typical home in Riverside 92506.

Estimated value$588,107
CheaperTypical $696,528Pricier

Pricier than 25% of homes nearby

Price per ft²$496
CheaperTypical $383Pricier

Pricier than 90% of homes nearby

Living area1,186 ft²
SmallerTypical 1,808 ft²Bigger

Bigger than 15% of homes nearby

Lot size0.2 ac
SmallerTypical 0.24 acBigger

Bigger than 39% of homes nearby

Year built1952
OlderTypical 1965Newer

Newer than 27% of homes nearby

How 6639 Mount Diablo Ave ranks against every home in each area.
MeasureThis homeMagnolia CenterRiverside 92506Riverside County
Estimated valuepricier than$588,10766% of homes25% of homes50% of homes
Price per ft²pricier than$49687% of homes90% of homes93% of homes
Living areabigger than1,186 ft²36% of homes15% of homes15% of homes
Lot sizebigger than0.2 ac73% of homes39% of homes54% of homes
Year builtnewer than195247% of homes27% of homes5% of homes

About 6639 Mount Diablo Ave

How much is 6639 Mount Diablo Ave, Riverside, CA worth?

The TopHap Estimate for 6639 Mount Diablo Ave, Riverside, CA is $588,107 as of Sep 24, 2026. The likely range is $561,159 to $615,055. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 6639 Mount Diablo Ave, Riverside, CA last sell?

6639 Mount Diablo Ave, Riverside, CA last sold on Jan 7, 2005 for $658,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 6639 Mount Diablo Ave, Riverside, CA?

6639 Mount Diablo Ave, Riverside, CA has 3 bedrooms, 1.8 bathrooms, 1,186 square feet of living space and a 0.20-acre lot.

When was 6639 Mount Diablo Ave, Riverside, CA built?

6639 Mount Diablo Ave, Riverside, CA was built in 1952, making it 74 years old. The building has 1 story.

What schools serve 6639 Mount Diablo Ave, Riverside, CA?

6639 Mount Diablo Ave, Riverside, CA is assigned to Pachappa Elementary School (elementary), rated B-; Poly High School (high), rated B; Central Middle School of Arts and Innovation (middle), rated C-. All sit in Riverside Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 6639 Mount Diablo Ave, Riverside, CA compare to other homes in Riverside 92506?

Among the 14,868 homes in Riverside 92506, it is worth more than 25% of them ($588,107 against a typical $696,528), its price per square foot is higher than 90% of them ($496 against a typical $383), it is bigger than 15% of them (1,186 ft² against a typical 1,808 ft²), its lot is bigger than 39% of them (0.2 ac against a typical 0.24 ac) and it is newer than 27% of them (1952 against a typical 1965). Measured against all of Riverside County, it is worth more than 50% 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 6639 Mount Diablo Ave, Riverside, CA?

The 2025 property tax bill for 6639 Mount Diablo Ave, Riverside, CA was $5,557. The county assessed it at $511,815.

More homes on Mount Diablo Ave

Closest homes

More homes in Riverside 92506

Assigned schools

Explore the area

See this home in context

Open 6639 Mount Diablo Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map