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Single Family ResidenceResidential
$822,772$498 / 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 Aug 30, 2026
Last sold for $129,678 on May 21, 2026

421 MONROE ST

NAPA, CA 94559
3
Beds
1
Baths
1,652 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1941
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$823K
$787K low$859K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$129,678 · May 21, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,804 (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.$266,626 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$111,757
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$154,869
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$261,399
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$266,626

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.35
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
50
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
37
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
51
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
36
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.Bungalow
CountyNAPA
Lot (acres)The size of the land the home sits on, from county records.0.17
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.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, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

Transaction History(7)

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.

M
Harvest Magnet Middle School
Middle · Grades 6–8 · 0.4 mi
E
Shearer Elementary SchoolD+
Elementary · Grades KG–5 · 0.5 mi
H
Napa High SchoolB-
High · Grades 9–12 · 1.3 mi

District: Napa Valley Unified School District

Neighborhood · ZIP 94559These 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.97
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.400

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.21%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.11%
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.25,170
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.628 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$87,352
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$122,518
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.25 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

421 Monroe 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.

  • Costs less per square foot than 90% of homes in Fuller Park
  • Bigger than 70% of homes in Fuller Park
  • Has a bigger lot than 65% of homes in Fuller Park
  • Older than 88% of homes in Napa County

What homes are worth in Napa 94559

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

This home
$458K$2.6M

This home is worth more than 54% of homes in Napa 94559.

How it measures up in Napa 94559

The dot is this home. The mark in the middle is the typical home in Napa 94559.

Estimated value$822,772
CheaperTypical $796,356Pricier

Pricier than 54% of homes nearby

Price per ft²$498
CheaperTypical $592Pricier

Pricier than 25% of homes nearby

Living area1,652 ft²
SmallerTypical 1,408 ft²Bigger

Bigger than 63% of homes nearby

Lot size0.17 ac
SmallerTypical 0.15 acBigger

Bigger than 64% of homes nearby

Year built1941
OlderTypical 1955Newer

Newer than 27% of homes nearby

How 421 Monroe St ranks against every home in each area.
MeasureThis homeFuller ParkNapa 94559Napa County
Estimated valuepricier than$822,77253% of homes54% of homes49% of homes
Price per ft²pricier than$49810% of homes25% of homes39% of homes
Living areabigger than1,652 ft²70% of homes63% of homes49% of homes
Lot sizebigger than0.17 ac65% of homes64% of homes48% of homes
Year builtnewer than194148% of homes27% of homes12% of homes

About 421 Monroe St

How much is 421 Monroe St, Napa, CA worth?

The TopHap Estimate for 421 Monroe St, Napa, CA is $822,772 as of Aug 30, 2026. The likely range is $786,504 to $859,040. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Monroe St, Napa, CA last sell?

421 Monroe St, Napa, CA last sold on May 21, 2026 for $129,678, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 421 Monroe St, Napa, CA?

421 Monroe St, Napa, CA has 3 bedrooms, 1 bathrooms, 1,652 square feet of living space and a 0.17-acre lot.

When was 421 Monroe St, Napa, CA built?

421 Monroe St, Napa, CA was built in 1941, making it 85 years old. It is a bungalow home. The building has 1 story.

What schools serve 421 Monroe St, Napa, CA?

421 Monroe St, Napa, CA is assigned to Harvest Magnet Middle School (middle); Shearer Elementary School (elementary), rated D+; Napa High School (high), rated B-. All sit in Napa Valley Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Monroe St, Napa, CA compare to other homes in Napa 94559?

Among the 7,778 homes in Napa 94559, it is worth more than 54% of them ($822,772 against a typical $796,356), its price per square foot is higher than 25% of them ($498 against a typical $592), it is bigger than 63% of them (1,652 ft² against a typical 1,408 ft²), its lot is bigger than 64% of them (0.17 ac against a typical 0.15 ac) and it is newer than 27% of them (1941 against a typical 1955). Measured against all of Napa County, it is worth more than 49% 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 421 Monroe St, Napa, CA?

The 2025 property tax bill for 421 Monroe St, Napa, CA was $3,804. The county assessed it at $266,626.

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