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Single Family ResidenceResidential
$1,343,891$827 / 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 97How 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 $27,500 on Aug 4, 1995

3866 MAMMOTH CAVE CT

PLEASANTON, CA 94588
4
Beds
2
Baths
1,626 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.
1969
Year BuiltThe year the home was originally built, according to county records.
2
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.

Valuation

$1.3M
$1.3M 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.$27,500 · Aug 4, 1995

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,707 (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.$314,931 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$96,579
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$225,352
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$308,620
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,260,900

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.38 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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
CountyALAMEDA
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1970
Lot (acres)The size of the land the home sits on, from county records.0.15
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.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

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.

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

E
Donlon Elementary SchoolA-
Elementary · Grades KG–5 · 0.5 mi
H
Foothill High SchoolA+
High · Grades 9–12 · 0.6 mi
M
Thomas S. Hart Middle SchoolA+
Middle · Grades 6–8 · 0.9 mi

District: Pleasanton Unified School District

Neighborhood · ZIP 94588These 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.47
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.83
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.549

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.37%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.39,803
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,030 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$179,765
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$208,378
Average tempThe average temperature here across a full year.59°F
Annual precipHow much rain and melted snow falls here in a typical year.21 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

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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

3866 Mammoth Cave Ct 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 69% of homes in Alameda County
  • Costs more per square foot than 78% of homes in Pleasanton 94588
  • Older than 81% of homes in Pleasanton 94588

What homes are worth in Pleasanton 94588

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

This home
$446K$3.4M

This home is worth more than 42% of homes in Pleasanton 94588.

How it measures up in Pleasanton 94588

The dot is this home. The mark in the middle is the typical home in Pleasanton 94588.

Estimated value$1,343,891
CheaperTypical $1,416,601Pricier

Pricier than 42% of homes nearby

Price per ft²$827
CheaperTypical $751Pricier

Pricier than 78% of homes nearby

Living area1,626 ft²
SmallerTypical 1,792 ft²Bigger

Bigger than 41% of homes nearby

Lot size0.15 ac
SmallerTypical 0.15 acBigger

Bigger than 51% of homes nearby

Year built1969
OlderTypical 1985Newer

Newer than 19% of homes nearby

How 3866 Mammoth Cave Ct ranks against every home in each area.
MeasureThis homeValley TrailsPleasanton 94588Alameda County
Estimated valuepricier than$1,343,89141% of homes42% of homes69% of homes
Price per ft²pricier than$82760% of homes78% of homes77% of homes
Living areabigger than1,626 ft²45% of homes41% of homes53% of homes
Lot sizebigger than0.15 ac48% of homes51% of homes61% of homes
Year builtnewer than196937% of homes19% of homes56% of homes

About 3866 Mammoth Cave Ct

How much is 3866 Mammoth Cave Ct, Pleasanton, CA worth?

The TopHap Estimate for 3866 Mammoth Cave Ct, Pleasanton, CA is $1,343,891 as of Sep 24, 2026. The likely range is $1,306,107 to $1,381,675. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3866 Mammoth Cave Ct, Pleasanton, CA last sell?

3866 Mammoth Cave Ct, Pleasanton, CA last sold on Aug 4, 1995 for $27,500, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 3866 Mammoth Cave Ct, Pleasanton, CA?

3866 Mammoth Cave Ct, Pleasanton, CA has 4 bedrooms, 2 bathrooms, 1,626 square feet of living space and a 0.15-acre lot.

When was 3866 Mammoth Cave Ct, Pleasanton, CA built?

3866 Mammoth Cave Ct, Pleasanton, CA was built in 1969, making it 57 years old. The building has 2 stories.

What schools serve 3866 Mammoth Cave Ct, Pleasanton, CA?

3866 Mammoth Cave Ct, Pleasanton, CA is assigned to Donlon Elementary School (elementary), rated A-; Foothill High School (high), rated A+; Thomas S. Hart Middle School (middle), rated A+. All sit in Pleasanton Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3866 Mammoth Cave Ct, Pleasanton, CA compare to other homes in Pleasanton 94588?

Among the 9,734 homes in Pleasanton 94588, it is worth more than 42% of them ($1,343,891 against a typical $1,416,601), its price per square foot is higher than 78% of them ($827 against a typical $751), it is bigger than 41% of them (1,626 ft² against a typical 1,792 ft²), its lot is bigger than 51% of them (0.15 ac against a typical 0.15 ac) and it is newer than 19% of them (1969 against a typical 1985). Measured against all of Alameda County, it is worth more than 69% 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 3866 Mammoth Cave Ct, Pleasanton, CA?

The 2025 property tax bill for 3866 Mammoth Cave Ct, Pleasanton, CA was $3,707. The county assessed it at $314,931.

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