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Single Family ResidenceResidential
$697,512$453 / 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 96How 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

6424 KEYSTONE ST

SIMI VALLEY, CA 93063
4
Beds
2
Baths
1,541 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.
0.15 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.
7
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

$698K
$669K low$726K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,129 (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.$312,432 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$121,251
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$191,181
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$306,306

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.49
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
82
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
46
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
34
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
85
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.Traditional/Old
CountyVENTURA
Lot (acres)The size of the land the home sits on, from county records.0.15
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
FireplaceWhether the home has a fireplace, and what kind.Yes
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 · 375 ft²

Transaction History(2)

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
White Oak Elementary SchoolA
Elementary · Grades KG–6 · 0.3 mi
H
Simi Valley High SchoolB
High · Grades 9–12 · 1.1 mi
M
Valley View Middle SchoolC-
Middle · Grades 6–8 · 2.9 mi

District: Simi Valley Unified School District

Neighborhood · ZIP 93063These 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.72
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.114
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.580

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.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.54,519
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,079 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,983
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,478
Average tempThe average temperature here across a full year.63°F
Annual precipHow much rain and melted snow falls here in a typical year.18 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.73%

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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

6424 Keystone 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 less than 75% of homes in Simi Valley 93063
  • Costs less per square foot than 69% of homes in Ventura County
  • Has a smaller lot than 67% of homes in Simi Valley 93063

What homes are worth in Simi Valley 93063

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

This home
$403K$1.5M

This home is worth more than 25% of homes in Simi Valley 93063.

How it measures up in Simi Valley 93063

The dot is this home. The mark in the middle is the typical home in Simi Valley 93063.

Estimated value$697,512
CheaperTypical $804,481Pricier

Pricier than 25% of homes nearby

Price per ft²$453
CheaperTypical $470Pricier

Pricier than 41% of homes nearby

Living area1,541 ft²
SmallerTypical 1,690 ft²Bigger

Bigger than 40% of homes nearby

Lot size0.15 ac
SmallerTypical 0.17 acBigger

Bigger than 33% of homes nearby

Year built1972
OlderTypical 1976Newer

Newer than 46% of homes nearby

How 6424 Keystone St ranks against every home in each area.
MeasureThis homeSimi Valley 93063Ventura County
Estimated valuepricier than$697,51225% of homes28% of homes
Price per ft²pricier than$45341% of homes31% of homes
Living areabigger than1,541 ft²40% of homes41% of homes
Lot sizebigger than0.15 ac33% of homes43% of homes
Year builtnewer than197246% of homes41% of homes

About 6424 Keystone St

How much is 6424 Keystone St, Simi Valley, CA worth?

The TopHap Estimate for 6424 Keystone St, Simi Valley, CA is $697,512 as of Aug 30, 2026. The likely range is $669,022 to $726,001. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 6424 Keystone St, Simi Valley, CA last sell?

6424 Keystone St, Simi Valley, CA last sold on Jan 1, 1900, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 6424 Keystone St, Simi Valley, CA?

6424 Keystone St, Simi Valley, CA has 4 bedrooms, 2 bathrooms, 1,541 square feet of living space and a 0.15-acre lot.

When was 6424 Keystone St, Simi Valley, CA built?

6424 Keystone St, Simi Valley, CA was built in 1972, making it 54 years old. It is a traditional/old home. The building has 1 story.

What schools serve 6424 Keystone St, Simi Valley, CA?

6424 Keystone St, Simi Valley, CA is assigned to White Oak Elementary School (elementary), rated A; Simi Valley High School (high), rated B; Valley View Middle School (middle), rated C-. All sit in Simi Valley Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 6424 Keystone St, Simi Valley, CA compare to other homes in Simi Valley 93063?

Among the 17,139 homes in Simi Valley 93063, it is worth more than 25% of them ($697,512 against a typical $804,481), its price per square foot is higher than 41% of them ($453 against a typical $470), it is bigger than 40% of them (1,541 ft² against a typical 1,690 ft²), its lot is bigger than 33% of them (0.15 ac against a typical 0.17 ac) and it is newer than 46% of them (1972 against a typical 1976). Measured against all of Ventura County, it is worth more than 28% 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 6424 Keystone St, Simi Valley, CA?

The 2025 property tax bill for 6424 Keystone St, Simi Valley, CA was $4,129. The county assessed it at $312,432.

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