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Single Family ResidenceResidential
$569,481$548 / 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 93How 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 $392,000 on Apr 25, 2016

20421 RIVER BLVD

MONTE RIO, CA 95462
2
Beds
2
Baths
1,040 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.
1998
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
3
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$569K
$529K low$610K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$392,000 · Apr 25, 2016
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.$569,481
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$455,585

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,026 (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.$490,823 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$150,592
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$340,231
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$481,200

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
100
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
78
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.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.Single Family Residence
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.0.11
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.None
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
Monte Rio Elementary SchoolB
Elementary · Grades KG–8 · 0.6 mi
H
Analy High SchoolA-
High · Grades 9–12 · 10.7 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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.Yes

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

20421 River Blvd 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 82% of homes in Sonoma County
  • Costs more per square foot than 67% of homes in Monte Rio 95462
  • Smaller than 86% of homes in Sonoma County
  • Has a smaller lot than 80% of homes in Monte Rio 95462
  • Newer than 97% of homes in Monte Rio 95462

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$1.4M

This home is worth more than 62% 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$569,481
CheaperTypical $502,961Pricier

Pricier than 62% of homes nearby

Price per ft²$548
CheaperTypical $458Pricier

Pricier than 67% of homes nearby

Living area1,040 ft²
SmallerTypical 1,082 ft²Bigger

Bigger than 47% of homes nearby

Lot size0.11 ac
SmallerTypical 0.19 acBigger

Bigger than 20% of homes nearby

Year built1998
OlderTypical 1950Newer

Newer than 97% of homes nearby

How 20421 River Blvd ranks against every home in each area.
MeasureThis homeMonte Rio 95462Sonoma County
Estimated valuepricier than$569,48162% of homes18% of homes
Price per ft²pricier than$54867% of homes66% of homes
Living areabigger than1,040 ft²47% of homes14% of homes
Lot sizebigger than0.11 ac20% of homes21% of homes
Year builtnewer than199897% of homes83% of homes

About 20421 River Blvd

How much is 20421 River Blvd, Monte Rio, CA worth?

The TopHap Estimate for 20421 River Blvd, Monte Rio, CA is $569,481 as of Jul 14, 2026. The likely range is $528,835 to $610,127. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20421 River Blvd, Monte Rio, CA last sell?

20421 River Blvd, Monte Rio, CA last sold on Apr 25, 2016 for $392,000, according to the county's recorded deed. TopHap holds 6 recorded sales for this parcel.

How big is 20421 River Blvd, Monte Rio, CA?

20421 River Blvd, Monte Rio, CA has 2 bedrooms, 2 bathrooms, 1,040 square feet of living space and a 0.11-acre lot.

When was 20421 River Blvd, Monte Rio, CA built?

20421 River Blvd, Monte Rio, CA was built in 1998, making it 28 years old. It is a custom design home. The building has 2 stories.

What schools serve 20421 River Blvd, Monte Rio, CA?

20421 River Blvd, 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 20421 River Blvd, Monte Rio, CA compare to other homes in Monte Rio 95462?

Among the 997 homes in Monte Rio 95462, it is worth more than 62% of them ($569,481 against a typical $502,961), its price per square foot is higher than 67% of them ($548 against a typical $458), it is bigger than 47% of them (1,040 ft² against a typical 1,082 ft²), its lot is bigger than 20% of them (0.11 ac against a typical 0.19 ac) and it is newer than 97% of them (1998 against a typical 1950). Measured against all of Sonoma County, it is worth more than 18% 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 20421 River Blvd, Monte Rio, CA?

The 2025 property tax bill for 20421 River Blvd, Monte Rio, CA was $9,026. The county assessed it at $490,823.

Closest homes

More homes in Monte Rio 95462

Assigned schools

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