Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$1,903,759$559 / 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 Sep 24, 2026
Last sold for $680,000 on Mar 10, 2006

434 MONTGOMERY ST

NAPA, CA 94559
4
Beds
2.5
Baths
3,407 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.
0.32 ac
Lot SizeThe size of the land the home sits on, from county records.
1937
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
11
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

$1.9M
$1.8M low$2M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$680,000 · Mar 10, 2006

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$13,611 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$1,092,824 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$444,703
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$648,121
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,092,824
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,092,824

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.32
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
35
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
CountyNAPA
Lot (acres)The size of the land the home sits on, from county records.0.32
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
CoolingThe type of cooling or air conditioning in the home.None
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.Yes

Transaction History(15)

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
Shearer Elementary SchoolD+
Elementary · Grades KG–5 · 0.4 mi
H
Napa High SchoolB-
High · Grades 9–12 · 1.3 mi
M
Silverado Middle SchoolC-
Middle · Grades 6–8 · 1.9 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%

Owner Tools

Do you own this home?
Claim this home

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

434 Montgomery 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.

  • Among the most valuable homes in Fuller Park
  • Costs less per square foot than 72% of homes in Fuller Park
  • Bigger than 98% of homes in Napa 94559
  • Has a bigger lot than 97% of homes in Fuller Park
  • Older than 92% 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
$450K$2.4M

This home is worth more than 96% 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$1,903,759
CheaperTypical $796,541Pricier

Pricier than 96% of homes nearby

Price per ft²$559
CheaperTypical $594Pricier

Pricier than 40% of homes nearby

Living area3,407 ft²
SmallerTypical 1,418 ft²Bigger

Bigger than 98% of homes nearby

Lot size0.32 ac
SmallerTypical 0.15 acBigger

Bigger than 89% of homes nearby

Year built1937
OlderTypical 1955Newer

Newer than 21% of homes nearby

How 434 Montgomery St ranks against every home in each area.
MeasureThis homeFuller ParkNapa 94559Napa County
Estimated valuepricier than$1,903,759almost all homes96% of homes91% of homes
Price per ft²pricier than$55928% of homes40% of homes57% of homes
Living areabigger than3,407 ft²97% of homes98% of homes94% of homes
Lot sizebigger than0.32 ac97% of homes89% of homes75% of homes
Year builtnewer than193737% of homes21% of homes8% of homes

About 434 Montgomery St

How much is 434 Montgomery St, Napa, CA worth?

The TopHap Estimate for 434 Montgomery St, Napa, CA is $1,903,759 as of Sep 24, 2026. The likely range is $1,776,118 to $2,031,400. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 434 Montgomery St, Napa, CA last sell?

434 Montgomery St, Napa, CA last sold on Mar 10, 2006 for $680,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 434 Montgomery St, Napa, CA?

434 Montgomery St, Napa, CA has 4 bedrooms, 2.5 bathrooms, 3,407 square feet of living space and a 0.32-acre lot.

When was 434 Montgomery St, Napa, CA built?

434 Montgomery St, Napa, CA was built in 1937, making it 89 years old. The building has 1 story.

What schools serve 434 Montgomery St, Napa, CA?

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

How does 434 Montgomery St, Napa, CA compare to other homes in Napa 94559?

Among the 7,736 homes in Napa 94559, it is worth more than 96% of them ($1,903,759 against a typical $796,541), its price per square foot is higher than 40% of them ($559 against a typical $594), it is bigger than 98% of them (3,407 ft² against a typical 1,418 ft²), its lot is bigger than 89% of them (0.32 ac against a typical 0.15 ac) and it is newer than 21% of them (1937 against a typical 1955). Measured against all of Napa County, it is worth more than 91% 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 434 Montgomery St, Napa, CA?

The 2026 property tax bill for 434 Montgomery St, Napa, CA was $13,611. The county assessed it at $1,092,824.

More homes on Montgomery St

Closest homes

More homes in Napa 94559

Assigned schools

Explore the area

See this home in context

Open 434 Montgomery St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map