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Single Family ResidenceResidential
$611,831$1,114 / 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 83How 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 $575,000 on May 4, 2020

623 PROSPECT ST

PETALUMA, CA 94952
1
Beds
1
Baths
549 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.
1,250 ft²
Lot SizeThe size of the land the home sits on, from county records.
1880
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$612K
$505K low$718K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$575,000 · May 4, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,338 (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.$641,418 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$256,566
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$384,852
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$628,842

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.19
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
60
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
36
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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
CountySONOMA
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.1950
Lot (acres)The size of the land the home sits on, from county records.0.03
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.None
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(6)

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
Valley Vista Elementary SchoolD
Elementary · Grades KG–6 · 0.3 mi
H
Petaluma High SchoolA-
High · Grades 9–12 · 0.5 mi
M
Petaluma Junior High SchoolC-
Middle · Grades 7–8 · 0.5 mi

District: Petaluma Joint Union High School District

Neighborhood · ZIP 94952These 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.92
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 100.359

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.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.5%
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.35,634
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.160 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$113,828
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$154,802
Average tempThe average temperature here across a full year.57°F
Annual precipHow much rain and melted snow falls here in a typical year.39 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

623 Prospect 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 93% of homes in Petaluma 94952
  • Among the highest price per square foot in Oakhill Brewster
  • Among the smallest homes in Oakhill Brewster
  • Has a smaller lot than 97% of homes in Petaluma 94952
  • Among the oldest homes in Sonoma County

What homes are worth in Petaluma 94952

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

This home
$503K$2.3M

This home is worth more than 7% of homes in Petaluma 94952.

How it measures up in Petaluma 94952

The dot is this home. The mark in the middle is the typical home in Petaluma 94952.

Estimated value$611,831
CheaperTypical $1,020,356Pricier

Pricier than 7% of homes nearby

Price per ft²$1114
CheaperTypical $606Pricier

Pricier than 98% of homes nearby

Living area549 ft²
SmallerTypical 1,689 ft²Bigger

Smaller than almost all homes nearby

Lot size1,250 ft²
SmallerTypical 0.18 acBigger

Bigger than 3% of homes nearby

Year built1880
OlderTypical 1964Newer

Older than almost all homes nearby

How 623 Prospect St ranks against every home in each area.
MeasureThis homeOakhill BrewsterPetaluma 94952Sonoma County
Estimated valuepricier than$611,83111% of homes7% of homes23% of homes
Price per ft²pricier than$1114almost all homes98% of homes98% of homes
Living areabigger than549 ft²almost no homesalmost no homesalmost no homes
Lot sizebigger than1,250 ft²4% of homes3% of homes7% of homes
Year builtnewer than1880almost no homesalmost no homesalmost no homes

About 623 Prospect St

How much is 623 Prospect St, Petaluma, CA worth?

The TopHap Estimate for 623 Prospect St, Petaluma, CA is $611,831 as of Aug 30, 2026. The likely range is $505,423 to $718,239. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 623 Prospect St, Petaluma, CA last sell?

623 Prospect St, Petaluma, CA last sold on May 4, 2020 for $575,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 623 Prospect St, Petaluma, CA?

623 Prospect St, Petaluma, CA has 1 bedrooms, 1 bathrooms, 549 square feet of living space and a 0.03-acre lot.

When was 623 Prospect St, Petaluma, CA built?

623 Prospect St, Petaluma, CA was built in 1880, making it 146 years old. The building has 1 story.

What schools serve 623 Prospect St, Petaluma, CA?

623 Prospect St, Petaluma, CA is assigned to Valley Vista Elementary School (elementary), rated D; Petaluma High School (high), rated A-; Petaluma Junior High School (middle), rated C-. All sit in Petaluma Joint Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 623 Prospect St, Petaluma, CA compare to other homes in Petaluma 94952?

Among the 10,076 homes in Petaluma 94952, it is worth more than 7% of them ($611,831 against a typical $1,020,356), its price per square foot is higher than 98% of them ($1114 against a typical $606), it is bigger than almost none of them (549 ft² against a typical 1,689 ft²), its lot is bigger than 3% of them (1,250 ft² against a typical 0.18 ac) and it is newer than almost none of them (1880 against a typical 1964). Measured against all of Sonoma County, it is worth more than 23% 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 623 Prospect St, Petaluma, CA?

The 2025 property tax bill for 623 Prospect St, Petaluma, CA was $7,338. The county assessed it at $641,418.

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