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Single Family ResidenceResidential
$567,924$476 / 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 91How 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 $275,000 on Mar 2, 2010

509 ARCH ST

MARTINEZ, CA 94553
2
Beds
2
Baths
1,193 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.
3,600 ft²
Lot SizeThe size of the land the home sits on, from county records.
1927
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$568K
$518K low$618K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$275,000 · Mar 2, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,128 (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.$362,058 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$302,819
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$59,239
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$354,960

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.48
74
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
75
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
38
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
43
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
14
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.44 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
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.1 percent flood zone

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
CountyCONTRA COSTA
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.1945
Lot (acres)The size of the land the home sits on, from county records.0.08
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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(2)

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

H
Alhambra High SchoolA-
High · Grades 9–12 · 0.4 mi
M
Martinez Junior High SchoolB
Middle · Grades 6–8 · 0.4 mi
E
John Muir Elementary SchoolB
Elementary · Grades KG–5 · 0.7 mi

District: Martinez Unified School District

Neighborhood · ZIP 94553These 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.97
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 100.490

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.4%
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.49,416
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.869 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$125,557
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$148,117
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.23 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

509 Arch 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 Martinez 94553
  • Smaller than 80% of homes in Contra Costa County
  • Has a smaller lot than 82% of homes in Contra Costa County
  • Older than 97% of homes in Contra Costa County

What homes are worth in Martinez 94553

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

This home
$356K$1.5M

This home is worth more than 25% of homes in Martinez 94553.

How it measures up in Martinez 94553

The dot is this home. The mark in the middle is the typical home in Martinez 94553.

Estimated value$567,924
CheaperTypical $715,499Pricier

Pricier than 25% of homes nearby

Price per ft²$476
CheaperTypical $463Pricier

Pricier than 57% of homes nearby

Living area1,193 ft²
SmallerTypical 1,550 ft²Bigger

Bigger than 22% of homes nearby

Lot size3,600 ft²
SmallerTypical 0.14 acBigger

Bigger than 21% of homes nearby

Year built1927
OlderTypical 1973Newer

Newer than 7% of homes nearby

How 509 Arch St ranks against every home in each area.
MeasureThis homeMartinez 94553Contra Costa County
Estimated valuepricier than$567,92425% of homes27% of homes
Price per ft²pricier than$47657% of homes54% of homes
Living areabigger than1,193 ft²22% of homes20% of homes
Lot sizebigger than3,600 ft²21% of homes18% of homes
Year builtnewer than19277% of homes3% of homes

About 509 Arch St

How much is 509 Arch St, Martinez, CA worth?

The TopHap Estimate for 509 Arch St, Martinez, CA is $567,924 as of Aug 30, 2026. The likely range is $518,047 to $617,801. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 509 Arch St, Martinez, CA last sell?

509 Arch St, Martinez, CA last sold on Mar 2, 2010 for $275,000, according to the county's recorded deed.

How big is 509 Arch St, Martinez, CA?

509 Arch St, Martinez, CA has 2 bedrooms, 2 bathrooms, 1,193 square feet of living space and a 0.08-acre lot.

When was 509 Arch St, Martinez, CA built?

509 Arch St, Martinez, CA was built in 1927, making it 99 years old. The building has 1 story.

What schools serve 509 Arch St, Martinez, CA?

509 Arch St, Martinez, CA is assigned to Alhambra High School (high), rated A-; Martinez Junior High School (middle), rated B; John Muir Elementary School (elementary), rated B. All sit in Martinez Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 509 Arch St, Martinez, CA compare to other homes in Martinez 94553?

Among the 16,279 homes in Martinez 94553, it is worth more than 25% of them ($567,924 against a typical $715,499), its price per square foot is higher than 57% of them ($476 against a typical $463), it is bigger than 22% of them (1,193 ft² against a typical 1,550 ft²), its lot is bigger than 21% of them (3,600 ft² against a typical 0.14 ac) and it is newer than 7% of them (1927 against a typical 1973). Measured against all of Contra Costa County, it is worth more than 27% 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 509 Arch St, Martinez, CA?

The 2025 property tax bill for 509 Arch St, Martinez, CA was $5,128. The county assessed it at $362,058.

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