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Single Family ResidenceResidential
$1,944,617$892 / 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
Last sold for $1,690,000 on Apr 30, 2021

644 FATHOM DR

SAN MATEO, CA 94404
3
Beds
3.5
Baths
2,180 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.
2,481 ft²
Lot SizeThe size of the land the home sits on, from county records.
1968
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.9M
$1.9M low$2M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,690,000 · Apr 30, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$22,557 (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.$1,865,894 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$932,947
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$932,947
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,829,308
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,843,740

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
CountySAN MATEO
Lot (acres)The size of the land the home sits on, from county records.0.06
ConstructionThe main material the home's frame and walls are built from.Frame (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, Basement
PoolWhether the property has a pool, and what kind, such as in-ground.No
ViewThe type of view from the property, or another feature of the site that affects value.Waterfront

Transaction History(10)

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.

M
Bayside AcademyB-
Middle · Grades KG–8 · 0.5 mi
E
LEAD Elementary SchoolD
Elementary · Grades KG–5 · 0.9 mi
H
Aragon High SchoolA+
High · Grades 9–12 · 2.6 mi

District: San Mateo-Foster City Elementary School District

Neighborhood · ZIP 94404These 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.78
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.469

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.34,562
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,017 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$165,214
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$197,174
Average tempThe average temperature here across a full year.58°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.66%

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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

644 Fathom 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 98% of homes in Mariner's Isle
  • Costs more per square foot than 72% of homes in Mariner's Isle
  • Bigger than 96% of homes in Mariner's Isle
  • Has a smaller lot than 96% of homes in San Mateo County
  • Older than 79% of homes in Mariner's Isle

What homes are worth in San Mateo 94404

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

This home
$596K$2.8M

This home is worth more than 68% of homes in San Mateo 94404.

How it measures up in San Mateo 94404

The dot is this home. The mark in the middle is the typical home in San Mateo 94404.

Estimated value$1,944,617
CheaperTypical $1,573,303Pricier

Pricier than 68% of homes nearby

Price per ft²$892
CheaperTypical $915Pricier

Pricier than 44% of homes nearby

Living area2,180 ft²
SmallerTypical 1,670 ft²Bigger

Bigger than 78% of homes nearby

Lot size2,481 ft²
SmallerTypical 0.14 acBigger

Bigger than 20% of homes nearby

Year built1968
OlderTypical 1974Newer

Newer than 21% of homes nearby

How 644 Fathom Dr ranks against every home in each area.
MeasureThis homeMariner's IsleSan Mateo 94404San Mateo County
Estimated valuepricier than$1,944,61798% of homes68% of homes65% of homes
Price per ft²pricier than$89272% of homes44% of homes41% of homes
Living areabigger than2,180 ft²96% of homes78% of homes73% of homes
Lot sizebigger than2,481 ft²15% of homes20% of homes4% of homes
Year builtnewer than196821% of homes21% of homes65% of homes

About 644 Fathom Dr

How much is 644 Fathom Dr, San Mateo, CA worth?

The TopHap Estimate for 644 Fathom Dr, San Mateo, CA is $1,944,617 as of Aug 30, 2026. The likely range is $1,865,441 to $2,023,793. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 644 Fathom Dr, San Mateo, CA last sell?

644 Fathom Dr, San Mateo, CA last sold on Apr 30, 2021 for $1,690,000, according to the county's recorded deed.

How big is 644 Fathom Dr, San Mateo, CA?

644 Fathom Dr, San Mateo, CA has 3 bedrooms, 3.5 bathrooms, 2,180 square feet of living space and a 0.06-acre lot.

When was 644 Fathom Dr, San Mateo, CA built?

644 Fathom Dr, San Mateo, CA was built in 1968, making it 58 years old. It is a contemporary home. The building has 2 stories.

What schools serve 644 Fathom Dr, San Mateo, CA?

644 Fathom Dr, San Mateo, CA is assigned to Bayside Academy (middle), rated B-; LEAD Elementary School (elementary), rated D; Aragon High School (high), rated A+. All sit in San Mateo-Foster City Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 644 Fathom Dr, San Mateo, CA compare to other homes in San Mateo 94404?

Among the 10,362 homes in San Mateo 94404, it is worth more than 68% of them ($1,944,617 against a typical $1,573,303), its price per square foot is higher than 44% of them ($892 against a typical $915), it is bigger than 78% of them (2,180 ft² against a typical 1,670 ft²), its lot is bigger than 20% of them (2,481 ft² against a typical 0.14 ac) and it is newer than 21% of them (1968 against a typical 1974). Measured against all of San Mateo County, it is worth more than 65% 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 644 Fathom Dr, San Mateo, CA?

The 2025 property tax bill for 644 Fathom Dr, San Mateo, CA was $22,557. The county assessed it at $1,865,894.

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