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Single Family ResidenceResidential
$2,549,341$1,016 / 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 92How 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
Last sold for $1,000 on Oct 12, 2005

15 CASTLE ROCK DR

MILL VALLEY, CA 94941
4
Beds
3.5
Baths
2,510 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.
0.26 ac
Lot SizeThe size of the land the home sits on, from county records.
1967
Year BuiltThe year the home was originally built, according to county records.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$2.5M
$2.4M low$2.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,000 · Oct 12, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$20,094 (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.$1,617,489 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,252,232
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$365,257
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,585,778

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.Contemporary
CountyMARIN
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.1984
Lot (acres)The size of the land the home sits on, from county records.0.26
HeatingThe type of heating system in the home.Central
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.Deck · 811 ft²Patio · 811 ft²

Transaction History(7)

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
Old Mill Elementary SchoolA+
Elementary · Grades KG–5 · 0.4 mi
M
Mill Valley Middle SchoolA
Middle · Grades 6–8 · 1.6 mi
H
Tamalpais High SchoolA+
High · Grades 9–12 · 1.7 mi

District: Mill Valley Elementary School District

Neighborhood · ZIP 94941These 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.91
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.439

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.93%
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.5.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.30,767
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,462 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$194,124
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$248,795
Average tempThe average temperature here across a full year.57°F
Annual precipHow much rain and melted snow falls here in a typical year.42 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

15 Castle Rock Dr 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 84% of homes in Marin County
  • Costs more per square foot than 75% of homes in Marin County
  • Bigger than 77% of homes in Marin County
  • Has a bigger lot than 70% of homes in Marin County
  • Newer than 70% of homes in Muir Woods Park

What homes are worth in Mill Valley 94941

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

This home
$763K$5.9M

This home is worth more than 68% of homes in Mill Valley 94941.

How it measures up in Mill Valley 94941

The dot is this home. The mark in the middle is the typical home in Mill Valley 94941.

Estimated value$2,549,341
CheaperTypical $2,065,568Pricier

Pricier than 68% of homes nearby

Price per ft²$1016
CheaperTypical $1050Pricier

Pricier than 43% of homes nearby

Living area2,510 ft²
SmallerTypical 1,962 ft²Bigger

Bigger than 72% of homes nearby

Lot size0.26 ac
SmallerTypical 0.19 acBigger

Bigger than 68% of homes nearby

Year built1967
OlderTypical 1959Newer

Newer than 65% of homes nearby

How 15 Castle Rock Dr ranks against every home in each area.
MeasureThis homeMuir Woods ParkMill Valley 94941Marin County
Estimated valuepricier than$2,549,34178% of homes68% of homes84% of homes
Price per ft²pricier than$101656% of homes43% of homes75% of homes
Living areabigger than2,510 ft²74% of homes72% of homes77% of homes
Lot sizebigger than0.26 ac51% of homes68% of homes70% of homes
Year builtnewer than196770% of homes65% of homes60% of homes

About 15 Castle Rock Dr

How much is 15 Castle Rock Dr, Mill Valley, CA worth?

The TopHap Estimate for 15 Castle Rock Dr, Mill Valley, CA is $2,549,341 as of Aug 30, 2026. The likely range is $2,356,620 to $2,742,062. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 15 Castle Rock Dr, Mill Valley, CA last sell?

15 Castle Rock Dr, Mill Valley, CA last sold on Oct 12, 2005 for $1,000, according to the county's recorded deed.

How big is 15 Castle Rock Dr, Mill Valley, CA?

15 Castle Rock Dr, Mill Valley, CA has 4 bedrooms, 3.5 bathrooms, 2,510 square feet of living space and a 0.26-acre lot.

When was 15 Castle Rock Dr, Mill Valley, CA built?

15 Castle Rock Dr, Mill Valley, CA was built in 1967, making it 59 years old. It is a contemporary home.

What schools serve 15 Castle Rock Dr, Mill Valley, CA?

15 Castle Rock Dr, Mill Valley, CA is assigned to Old Mill Elementary School (elementary), rated A+; Mill Valley Middle School (middle), rated A; Tamalpais High School (high), rated A+. All sit in Mill Valley Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 15 Castle Rock Dr, Mill Valley, CA compare to other homes in Mill Valley 94941?

Among the 10,554 homes in Mill Valley 94941, it is worth more than 68% of them ($2,549,341 against a typical $2,065,568), its price per square foot is higher than 43% of them ($1016 against a typical $1050), it is bigger than 72% of them (2,510 ft² against a typical 1,962 ft²), its lot is bigger than 68% of them (0.26 ac against a typical 0.19 ac) and it is newer than 65% of them (1967 against a typical 1959). Measured against all of Marin County, it is worth more than 84% 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 15 Castle Rock Dr, Mill Valley, CA?

The 2025 property tax bill for 15 Castle Rock Dr, Mill Valley, CA was $20,094. The county assessed it at $1,617,489.

More homes on Castle Rock Dr

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