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Planned Unit Development (Pud)Residential
$1,299,760$469 / 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 94How 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 $860,000 on Jun 1, 2005

11578 MARIPOSA BAY LN

PORTER RANCH, CA 91326
4
Beds
4
Baths
2,770 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.
0.25 ac
Lot SizeThe size of the land the home sits on, from county records.
1997
Year BuiltThe year the home was originally built, according to county records.

Valuation

$1.3M
$1.2M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$860,000 · Jun 1, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,617 (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.$1,222,722 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$849,796
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$372,926
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,198,748

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Planned Unit Development (Pud)
CountyLOS ANGELES
Lot (acres)The size of the land the home sits on, from county records.0.25
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

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.

E
Castlebay Lane Charter Elementary SchoolA+
Elementary · Grades KG–5 · 1.3 mi
M
Porter Ranch Community SchoolA+
Middle · Grades KG–8 · 1.4 mi
H
Chatsworth Charter High SchoolB-
High · Grades 9–12 · 2.3 mi

District: Los Angeles Unified School District

Neighborhood · ZIP 91326These 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.53
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.111
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.808

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.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.8%
PopulationHow many people live in this area.36,202
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,793 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$133,178
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$160,858
Average tempThe average temperature here across a full year.63°F
Annual precipHow much rain and melted snow falls here in a typical year.20 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

11578 Mariposa Bay Ln 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 78% of homes in Los Angeles County
  • Costs less per square foot than 76% of homes in Porter Ranch
  • Bigger than 85% of homes in Los Angeles County
  • Has a bigger lot than 73% of homes in Los Angeles County
  • Newer than 94% of homes in Porter Ranch

What homes are worth in Porter Ranch 91326

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

This home
$640K$2.5M

This home is worth more than 65% of homes in Porter Ranch 91326.

How it measures up in Porter Ranch 91326

The dot is this home. The mark in the middle is the typical home in Porter Ranch 91326.

Estimated value$1,299,760
CheaperTypical $1,199,792Pricier

Pricier than 65% of homes nearby

Price per ft²$469
CheaperTypical $502Pricier

Pricier than 26% of homes nearby

Living area2,770 ft²
SmallerTypical 2,362 ft²Bigger

Bigger than 70% of homes nearby

Lot size0.25 ac
SmallerTypical 0.25 acBigger

Bigger than 50% of homes nearby

Year built1997
OlderTypical 1978Newer

Newer than 71% of homes nearby

How 11578 Mariposa Bay Ln ranks against every home in each area.
MeasureThis homePorter RanchPorter Ranch 91326Los Angeles County
Estimated valuepricier than$1,299,76073% of homes65% of homes78% of homes
Price per ft²pricier than$46924% of homes26% of homes24% of homes
Living areabigger than2,770 ft²79% of homes70% of homes85% of homes
Lot sizebigger than0.25 ac52% of homes50% of homes73% of homes
Year builtnewer than199794% of homes71% of homes90% of homes

About 11578 Mariposa Bay Ln

How much is 11578 Mariposa Bay Ln, Porter Ranch, CA worth?

The TopHap Estimate for 11578 Mariposa Bay Ln, Porter Ranch, CA is $1,299,760 as of Sep 24, 2026. The likely range is $1,219,590 to $1,379,930. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 11578 Mariposa Bay Ln, Porter Ranch, CA last sell?

11578 Mariposa Bay Ln, Porter Ranch, CA last sold on Jun 1, 2005 for $860,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 11578 Mariposa Bay Ln, Porter Ranch, CA?

11578 Mariposa Bay Ln, Porter Ranch, CA has 4 bedrooms, 4 bathrooms, 2,770 square feet of living space and a 0.25-acre lot.

When was 11578 Mariposa Bay Ln, Porter Ranch, CA built?

11578 Mariposa Bay Ln, Porter Ranch, CA was built in 1997, making it 29 years old.

What schools serve 11578 Mariposa Bay Ln, Porter Ranch, CA?

11578 Mariposa Bay Ln, Porter Ranch, CA is assigned to Castlebay Lane Charter Elementary School (elementary), rated A+; Porter Ranch Community School (middle), rated A+; Chatsworth Charter High School (high), rated B-. All sit in Los Angeles Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 11578 Mariposa Bay Ln, Porter Ranch, CA compare to other homes in Porter Ranch 91326?

Among the 12,127 homes in Porter Ranch 91326, it is worth more than 65% of them ($1,299,760 against a typical $1,199,792), its price per square foot is higher than 26% of them ($469 against a typical $502), it is bigger than 70% of them (2,770 ft² against a typical 2,362 ft²), its lot is bigger than 50% of them (0.25 ac against a typical 0.25 ac) and it is newer than 71% of them (1997 against a typical 1978). Measured against all of Los Angeles County, it is worth more than 78% 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 11578 Mariposa Bay Ln, Porter Ranch, CA?

The 2025 property tax bill for 11578 Mariposa Bay Ln, Porter Ranch, CA was $14,617. The county assessed it at $1,222,722.

More homes on Mariposa Bay Ln

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