Duplex (2 Units, Any Combination)Residential
427 UPHAM ST
PETALUMA, CA 94952
2
Beds
1
Baths
1,632 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.
0.2 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.
1
StoriesHow many floors the home has above ground.
4
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.
Tax & Assessment
Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,249 (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.$90,235 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$26,485
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$63,750
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$88,466
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.20
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
64
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.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Custom Design
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.1970
Lot (acres)The size of the land the home sits on, from county records.0.20
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.None
CoolingThe type of cooling or air conditioning in the home.None
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.Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.
EHM
Valley Vista Elementary SchoolC-
Elementary · Grades KG–6 · 0.2 mi
Petaluma High SchoolB
High · Grades 9–12 · 0.4 mi
Petaluma Junior High SchoolB-
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%
Owner Tools
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Claim this homeData 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
427 Upham 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.
- Has a bigger lot than 65% of homes in Western
- Older than 66% of homes in Sonoma County
How it measures up in Petaluma 94952
The dot is this home. The mark in the middle is the typical home in Petaluma 94952.
Living area1,632 ft²
SmallerTypical 1,687 ft²Bigger
Bigger than 47% of homes nearby
Lot size0.2 ac
SmallerTypical 0.18 acBigger
Bigger than 53% of homes nearby
Year built1969
OlderTypical 1964Newer
Newer than 57% of homes nearby
| Measure | This home | Western | Petaluma 94952 | Sonoma County |
|---|---|---|---|---|
| Living areabigger than | 1,632 ft² | 41% of homes | 47% of homes | 54% of homes |
| Lot sizebigger than | 0.2 ac | 65% of homes | 53% of homes | 60% of homes |
| Year builtnewer than | 1969 | 52% of homes | 57% of homes | 34% of homes |
About 427 Upham St
When did 427 Upham St, Petaluma, CA last sell?
427 Upham St, Petaluma, CA last sold on Jan 1, 1900, according to the county's recorded deed.
How big is 427 Upham St, Petaluma, CA?
427 Upham St, Petaluma, CA has 2 bedrooms, 1 bathrooms, 1,632 square feet of living space and a 0.20-acre lot.
When was 427 Upham St, Petaluma, CA built?
427 Upham St, Petaluma, CA was built in 1969, making it 57 years old. It is a custom design home. The building has 1 story.
What schools serve 427 Upham St, Petaluma, CA?
427 Upham St, Petaluma, CA is assigned to Valley Vista Elementary School (elementary), rated C-; Petaluma High School (high), rated B; Petaluma Junior High School (middle), rated B-. All sit in Petaluma Joint Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.
How does 427 Upham St, Petaluma, CA compare to other homes in Petaluma 94952?
Among the 10,074 homes in Petaluma 94952, it is bigger than 47% of them (1,632 ft² against a typical 1,687 ft²), its lot is bigger than 53% of them (0.2 ac against a typical 0.18 ac) and it is newer than 57% of them (1969 against a typical 1964). These shares are recounted nightly from the full county assessor record for each area, not from active listings.
What are the property taxes on 427 Upham St, Petaluma, CA?
The 2025 property tax bill for 427 Upham St, Petaluma, CA was $1,249. The county assessed it at $90,235.
More homes on Upham St
- 418 Upham St2 bd · 1.5 ba · 2,220 ft² · Sold $3.5M · Feb 2026
- 419 Upham St$835K4 bd · 1 ba · 1,516 ft² · Sold $825K · May 2025
- 500 Upham St$904K2 bd · 1 ba · 1,281 ft² · Sold $895K · Jul 2024
- 425 Upham St5 bd · 2 ba · 2,586 ft² · Sold $900K · Jul 2024
- 508 Upham St$1.1M2 bd · 1 ba · 1,158 ft² · Sold $1.1M · Jun 2024
- 501 Upham St$1M3 bd · 2 ba · 1,320 ft² · Sold $1.1M · Dec 2023
- 134 Upham St$1.6M3 bd · 2 ba · 1,368 ft² · Sold $1.4M · Apr 2022
- 117 Upham St$939K2 bd · 2 ba · 1,168 ft² · Sold $915K · Jun 2021
- 119 Upham St4 bd · 2.5 ba · 1,793 ft² · Sold $750K · Jan 2021
- 537 Upham St2 bd · 1 ba · 2,103 ft² · Sold $780K · Jul 2020
- 109 Upham St$872K3 bd · 1 ba · 1,152 ft² · Sold $820K · Dec 2019
- 320 Upham St2 bd · 1 ba · 1,838 ft² · Sold $1.1M · Oct 2019
Closest homes
- 425 Upham St55 ft · 5 bd · 2 ba · 2,586 ft² · Sold $900K · Jul 2024
- 1 Tunzi Pkwy$885K84 ft · 3 bd · 1 ba · 1,373 ft² · Sold $330K · May 2000
- 3 Tunzi Pkwy$857K78 ft · 3 bd · 2 ba · 1,253 ft² · Sold $610K · Apr 2018
- 421 Upham St$1M105 ft · 3 bd · 2.5 ba · 1,856 ft² · Sold $925K · Mar 2019
- 5 Tunzi Pkwy$683K96 ft · 2 bd · 1 ba · 883 ft² · Sold $279K · Dec 2011
- 7 Tunzi Pkwy$580K130 ft · 2 bd · 1 ba · 883 ft² · Sold Jan 1900
- 512 Baker St$805K156 ft · 2 bd · 1 ba · 1,028 ft² · Sold Jan 1900
- 514 Baker St$1.4M146 ft · 4 bd · 2.5 ba · 2,785 ft² · Sold Jan 1900
More homes in Petaluma 94952
- 111 Haverfield Ln$1.3M4 bd · 2.5 ba · 1,975 ft² · Sold $1.6M · Oct 2026
- 949 Mcnear Ave$1.1M4 bd · 2.5 ba · 2,446 ft² · Sold $1.2M · Oct 2026
- 3 Lavender Ter$1.7M4 bd · 3 ba · 2,654 ft² · Sold $1.8M · Oct 2026
- 47 Barn View Ct0.15 ac · Sold $2M · Oct 2026
- 445 Marshall Ave$1.3M3 bd · 2 ba · 1,777 ft² · Sold $1.2M · Oct 2026
- 326 Liberty St$959K3 bd · 3.5 ba · 2,277 ft² · Sold $1M · Oct 2026
- 1165 Western Ave$872K3 bd · 1 ba · 1,130 ft² · Sold $625K · Oct 2026
- 314 Caulfield Ln$925K3 bd · 3 ba · 2,452 ft² · Sold $988K · Oct 2026
- 748 Paula Ln$1.1M4 bd · 2 ba · 1,638 ft² · Sold $1.1M · Oct 2026
- 2439 Petaluma Blvd N$811K2 bd · 1 ba · 860 ft² · Sold $350K · Oct 2026
- 4270 Roblar Rd$899K3 bd · 2 ba · 1,631 ft² · Sold $899K · Oct 2026
- 2 Rain Tree Ct$469K2 bd · 1 ba · 972 ft² · Sold $500K · Sep 2026
Assigned schools
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