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Single Family ResidenceResidential
$533,056$725 / 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 98How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $470,000 on Apr 22, 2019

643 MILL ST

SANTA ROSA, CA 95404
1
Beds
1
Baths
735 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1925
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

$533K
$520K low$546K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$470,000 · Apr 22, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,009 (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.$534,774 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$213,909
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$320,865
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$524,289

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.22
53
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
34
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
27
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.16 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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
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.1960
Lot (acres)The size of the land the home sits on, from county records.0.11
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
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, Detached
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.

E
Luther Burbank Elementary SchoolC
Elementary · Grades KG–6 · 0.3 mi
M
Montgomery High SchoolB
Middle · Grades 7–12 · 1.5 mi

District: Santa Rosa Elementary School District

Neighborhood · ZIP 95404These 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.102
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.82
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.598

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.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.5%
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.43,241
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.541 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$104,299
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$140,649
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.43 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

643 Mill 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 90% of homes in Santa Rosa 95404
  • Costs more per square foot than 96% of homes in Burbank Gardens
  • Smaller than 98% of homes in Santa Rosa 95404
  • Has a smaller lot than 80% of homes in Santa Rosa 95404
  • Older than 95% of homes in Sonoma County

What homes are worth in Santa Rosa 95404

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

This home
$384K$2.6M

This home is worth more than 10% of homes in Santa Rosa 95404.

How it measures up in Santa Rosa 95404

The dot is this home. The mark in the middle is the typical home in Santa Rosa 95404.

Estimated value$533,056
CheaperTypical $824,395Pricier

Pricier than 10% of homes nearby

Price per ft²$725
CheaperTypical $499Pricier

Pricier than 94% of homes nearby

Living area735 ft²
SmallerTypical 1,698 ft²Bigger

Bigger than 2% of homes nearby

Lot size0.11 ac
SmallerTypical 0.18 acBigger

Bigger than 20% of homes nearby

Year built1925
OlderTypical 1971Newer

Newer than 8% of homes nearby

How 643 Mill St ranks against every home in each area.
MeasureThis homeBurbank GardensSanta Rosa 95404Sonoma County
Estimated valuepricier than$533,05634% of homes10% of homes13% of homes
Price per ft²pricier than$72596% of homes94% of homes89% of homes
Living areabigger than735 ft²6% of homes2% of homes3% of homes
Lot sizebigger than0.11 ac62% of homes20% of homes22% of homes
Year builtnewer than192550% of homes8% of homes5% of homes

About 643 Mill St

How much is 643 Mill St, Santa Rosa, CA worth?

The TopHap Estimate for 643 Mill St, Santa Rosa, CA is $533,056 as of Sep 24, 2026. The likely range is $519,841 to $546,271. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 643 Mill St, Santa Rosa, CA last sell?

643 Mill St, Santa Rosa, CA last sold on Apr 22, 2019 for $470,000, according to the county's recorded deed. TopHap holds 6 recorded sales for this parcel.

How big is 643 Mill St, Santa Rosa, CA?

643 Mill St, Santa Rosa, CA has 1 bedrooms, 1 bathrooms, 735 square feet of living space and a 0.11-acre lot.

When was 643 Mill St, Santa Rosa, CA built?

643 Mill St, Santa Rosa, CA was built in 1925, making it 101 years old. It is a custom design home. The building has 1 story.

What schools serve 643 Mill St, Santa Rosa, CA?

643 Mill St, Santa Rosa, CA is assigned to Luther Burbank Elementary School (elementary), rated C; Montgomery High School (middle), rated B. All sit in Santa Rosa Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 643 Mill St, Santa Rosa, CA compare to other homes in Santa Rosa 95404?

Among the 12,321 homes in Santa Rosa 95404, it is worth more than 10% of them ($533,056 against a typical $824,395), its price per square foot is higher than 94% of them ($725 against a typical $499), it is bigger than 2% of them (735 ft² against a typical 1,698 ft²), its lot is bigger than 20% of them (0.11 ac against a typical 0.18 ac) and it is newer than 8% of them (1925 against a typical 1971). Measured against all of Sonoma County, it is worth more than 13% 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 643 Mill St, Santa Rosa, CA?

The 2025 property tax bill for 643 Mill St, Santa Rosa, CA was $6,009. The county assessed it at $534,774.

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