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Duplex (2 Units, Any Combination)Residential
Last sold for $380,000 on Sep 9, 1999

18504 RIVERSIDE DR

SONOMA, CA 95476
5
Beds
3.5
Baths
2,860 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.
0.47 ac
Lot SizeThe size of the land the home sits on, from county records.
1989
Year BuiltThe year the home was originally built, according to county records.
2
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

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$380,000 · Sep 9, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,604 (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.$595,725 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$156,764
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$438,961
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$584,045

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.38
100
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
55
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.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.175 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Custom Design
CountySONOMA
Lot (acres)The size of the land the home sits on, from county records.0.47
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
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(2)

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
El Verano Elementary SchoolC-
Elementary · Grades KG–5 · 0.1 mi
M
Altimira Middle SchoolD
Middle · Grades 6–8 · 0.7 mi
H
Sonoma Valley High SchoolB+
High · Grades 9–12 · 2.3 mi

District: Sonoma Valley Unified School District

Neighborhood · ZIP 95476These 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.107
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 100.432

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.90%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.33,854
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.306 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$99,739
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$144,842
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.32 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

18504 Riverside Dr 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.

  • Bigger than 93% of homes in Sonoma County
  • Has a bigger lot than 77% of homes in Sonoma County
  • Newer than 80% of homes in Sonoma 95476

How it measures up in Sonoma 95476

The dot is this home. The mark in the middle is the typical home in Sonoma 95476.

Living area2,860 ft²
SmallerTypical 1,580 ft²Bigger

Bigger than 91% of homes nearby

Lot size0.47 ac
SmallerTypical 0.18 acBigger

Bigger than 74% of homes nearby

Year built1989
OlderTypical 1976Newer

Newer than 80% of homes nearby

How 18504 Riverside Dr ranks against every home in each area.
MeasureThis homeSonoma 95476Sonoma County
Living areabigger than2,860 ft²91% of homes93% of homes
Lot sizebigger than0.47 ac74% of homes77% of homes
Year builtnewer than198980% of homes72% of homes

About 18504 Riverside Dr

When did 18504 Riverside Dr, Sonoma, CA last sell?

18504 Riverside Dr, Sonoma, CA last sold on Sep 9, 1999 for $380,000, according to the county's recorded deed.

How big is 18504 Riverside Dr, Sonoma, CA?

18504 Riverside Dr, Sonoma, CA has 5 bedrooms, 3.5 bathrooms, 2,860 square feet of living space and a 0.47-acre lot.

When was 18504 Riverside Dr, Sonoma, CA built?

18504 Riverside Dr, Sonoma, CA was built in 1989, making it 37 years old. It is a custom design home. The building has 2 stories.

What schools serve 18504 Riverside Dr, Sonoma, CA?

18504 Riverside Dr, Sonoma, CA is assigned to El Verano Elementary School (elementary), rated C-; Altimira Middle School (middle), rated D; Sonoma Valley High School (high), rated B+. All sit in Sonoma Valley Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18504 Riverside Dr, Sonoma, CA compare to other homes in Sonoma 95476?

Among the 11,734 homes in Sonoma 95476, it is bigger than 91% of them (2,860 ft² against a typical 1,580 ft²), its lot is bigger than 74% of them (0.47 ac against a typical 0.18 ac) and it is newer than 80% of them (1989 against a typical 1976). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 18504 Riverside Dr, Sonoma, CA?

The 2025 property tax bill for 18504 Riverside Dr, Sonoma, CA was $9,604. The county assessed it at $595,725.

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