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Single Family ResidenceResidential
$346,146$269 / 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 74How 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

21891 RUSSIAN RIVER AVE

MONTE RIO, CA 95462
2
Beds
1
Baths
1,289 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.
4,160 ft²
Lot SizeThe size of the land the home sits on, from county records.
1907
Year BuiltThe year the home was originally built, according to county records.
2
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.

Valuation

$346K
$257K low$435K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$997 (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.$30,837 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$11,248
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$19,589
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$30,837

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.41
99
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
80
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.197 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.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.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.1924
Lot (acres)The size of the land the home sits on, from county records.0.10
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.Yes
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(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
Monte Rio Elementary SchoolB
Elementary · Grades KG–8 · 0.6 mi
H
Analy High SchoolA-
High · Grades 9–12 · 11.8 mi

District: West Sonoma County Union High School District

Neighborhood · ZIP 95462These 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.182
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.79
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.379

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.67%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.1,428
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.213 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$72,840
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$107,644
Average tempThe average temperature here across a full year.57°F
Annual precipHow much rain and melted snow falls here in a typical year.53 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

21891 Russian River 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 98% of homes in Sonoma County
  • Among the lowest price per square foot in Sonoma County
  • Smaller than 69% of homes in Sonoma County
  • Has a smaller lot than 86% of homes in Monte Rio 95462
  • Older than 98% of homes in Sonoma County

What homes are worth in Monte Rio 95462

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

This home
$193K$1.3M

This home is worth more than 20% of homes in Monte Rio 95462.

How it measures up in Monte Rio 95462

The dot is this home. The mark in the middle is the typical home in Monte Rio 95462.

Estimated value$346,146
CheaperTypical $499,126Pricier

Pricier than 20% of homes nearby

Price per ft²$269
CheaperTypical $457Pricier

Pricier than 5% of homes nearby

Living area1,289 ft²
SmallerTypical 1,074 ft²Bigger

Bigger than 65% of homes nearby

Lot size4,160 ft²
SmallerTypical 0.19 acBigger

Bigger than 14% of homes nearby

Year built1907
OlderTypical 1950Newer

Newer than 5% of homes nearby

How 21891 Russian River Ave ranks against every home in each area.
MeasureThis homeMonte Rio 95462Sonoma County
Estimated valuepricier than$346,14620% of homes2% of homes
Price per ft²pricier than$2695% of homesalmost no homes
Living areabigger than1,289 ft²65% of homes31% of homes
Lot sizebigger than4,160 ft²14% of homes17% of homes
Year builtnewer than19075% of homes2% of homes

About 21891 Russian River Ave

How much is 21891 Russian River Ave, Monte Rio, CA worth?

The TopHap Estimate for 21891 Russian River Ave, Monte Rio, CA is $346,146 as of Jul 14, 2026. The likely range is $256,897 to $435,395. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21891 Russian River Ave, Monte Rio, CA last sell?

21891 Russian River Ave, Monte Rio, CA last sold on Oct 5, 1999, according to the county's recorded deed.

How big is 21891 Russian River Ave, Monte Rio, CA?

21891 Russian River Ave, Monte Rio, CA has 2 bedrooms, 1 bathrooms, 1,289 square feet of living space and a 0.10-acre lot.

When was 21891 Russian River Ave, Monte Rio, CA built?

21891 Russian River Ave, Monte Rio, CA was built in 1907, making it 119 years old. The building has 2 stories.

What schools serve 21891 Russian River Ave, Monte Rio, CA?

21891 Russian River Ave, Monte Rio, CA is assigned to Monte Rio Elementary School (elementary), rated B; Analy High School (high), rated A-. All sit in West Sonoma County Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21891 Russian River Ave, Monte Rio, CA compare to other homes in Monte Rio 95462?

Among the 992 homes in Monte Rio 95462, it is worth more than 20% of them ($346,146 against a typical $499,126), its price per square foot is higher than 5% of them ($269 against a typical $457), it is bigger than 65% of them (1,289 ft² against a typical 1,074 ft²), its lot is bigger than 14% of them (4,160 ft² against a typical 0.19 ac) and it is newer than 5% of them (1907 against a typical 1950). Measured against all of Sonoma County, it is worth more than 2% 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 21891 Russian River Ave, Monte Rio, CA?

The 2025 property tax bill for 21891 Russian River Ave, Monte Rio, CA was $997. The county assessed it at $30,837.

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