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Single Family ResidenceResidential
$578,218$466 / 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 Jul 14, 2026
Last sold for $275,000 on Sep 16, 2010

640 POWDERHORN AVE

SANTA ROSA, CA 95407
3
Beds
2
Baths
1,240 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.
3,999 ft²
Lot SizeThe size of the land the home sits on, from county records.
1999
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$578K
$556K low$601K 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 · Sep 16, 2010
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$398,218
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$318,574
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.32%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$180,000
QUICKEN LNS · recorded Jun 2, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,040 (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.$352,311 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$64,052
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$288,259
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$352,311

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.29
47
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
73
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.12 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
CountySonoma
Lot (acres)The size of the land the home sits on, from county records.0.09
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

E
Taylor Mountain Elementary SchoolD-
Elementary · Grades PK–6 · 0.2 mi
M
Montgomery High SchoolB
Middle · Grades 7–12 · 3.0 mi

District: Santa Rosa High School District

Neighborhood · ZIP 95407These 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.89
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.460

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.13%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.14%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.44,580
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,957 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$74,343
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$96,028
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.35 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

640 Powderhorn Ave 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 81% of homes in Sonoma County
  • Costs more per square foot than 71% of homes in Santa Rosa 95407
  • Smaller than 73% of homes in Sonoma County
  • Has a smaller lot than 85% of homes in Sonoma County
  • Newer than 84% of homes in Sonoma County

What homes are worth in Santa Rosa 95407

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

This home
$362K$1M

This home is worth more than 45% of homes in Santa Rosa 95407.

How it measures up in Santa Rosa 95407

The dot is this home. The mark in the middle is the typical home in Santa Rosa 95407.

Estimated value$578,218
CheaperTypical $596,065Pricier

Pricier than 45% of homes nearby

Price per ft²$466
CheaperTypical $422Pricier

Pricier than 71% of homes nearby

Living area1,240 ft²
SmallerTypical 1,330 ft²Bigger

Bigger than 37% of homes nearby

Lot size3,999 ft²
SmallerTypical 0.14 acBigger

Bigger than 25% of homes nearby

Year built1999
OlderTypical 1990Newer

Newer than 66% of homes nearby

How 640 Powderhorn Ave ranks against every home in each area.
MeasureThis homeSanta Rosa 95407Sonoma County
Estimated valuepricier than$578,21845% of homes19% of homes
Price per ft²pricier than$46671% of homes43% of homes
Living areabigger than1,240 ft²37% of homes27% of homes
Lot sizebigger than3,999 ft²25% of homes15% of homes
Year builtnewer than199966% of homes84% of homes

About 640 Powderhorn Ave

How much is 640 Powderhorn Ave, Santa Rosa, CA worth?

The TopHap Estimate for 640 Powderhorn Ave, Santa Rosa, CA is $578,218 as of Jul 14, 2026. The likely range is $555,798 to $600,638. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 640 Powderhorn Ave, Santa Rosa, CA last sell?

640 Powderhorn Ave, Santa Rosa, CA last sold on Sep 16, 2010 for $275,000, according to the county's recorded deed. TopHap holds 7 recorded sales for this parcel.

How big is 640 Powderhorn Ave, Santa Rosa, CA?

640 Powderhorn Ave, Santa Rosa, CA has 3 bedrooms, 2 bathrooms, 1,240 square feet of living space and a 0.09-acre lot.

When was 640 Powderhorn Ave, Santa Rosa, CA built?

640 Powderhorn Ave, Santa Rosa, CA was built in 1999, making it 27 years old. The building has 1 story.

What schools serve 640 Powderhorn Ave, Santa Rosa, CA?

640 Powderhorn Ave, Santa Rosa, CA is assigned to Taylor Mountain Elementary School (elementary), rated D-; Montgomery High School (middle), rated B. All sit in Santa Rosa High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 640 Powderhorn Ave, Santa Rosa, CA compare to other homes in Santa Rosa 95407?

Among the 9,188 homes in Santa Rosa 95407, it is worth more than 45% of them ($578,218 against a typical $596,065), its price per square foot is higher than 71% of them ($466 against a typical $422), it is bigger than 37% of them (1,240 ft² against a typical 1,330 ft²), its lot is bigger than 25% of them (3,999 ft² against a typical 0.14 ac) and it is newer than 66% of them (1999 against a typical 1990). Measured against all of Sonoma County, it is worth more than 19% 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 640 Powderhorn Ave, Santa Rosa, CA?

The 2025 property tax bill for 640 Powderhorn Ave, Santa Rosa, CA was $4,040. The county assessed it at $352,311.

Closest homes

More homes in Santa Rosa 95407

Assigned schools

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