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Single Family ResidenceResidential
$482,256$450 / 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 91How 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 $138,000 on Jan 31, 1996

4278 MERCER CT

CONCORD, CA 94521
3
Beds
2
Baths
1,071 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.
1961
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$482K
$437K low$527K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$138,000 · Jan 31, 1996

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,542 (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.$233,803 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$136,815
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$96,988
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$229,220

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.30
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
59
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
43
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
36
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
14
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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
CountyCONTRA COSTA
Lot (acres)The size of the land the home sits on, from county records.0.17
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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.No

Transaction History(4)

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
Mountain View Elementary SchoolB
Elementary · Grades KG–5 · 0.4 mi
M
El Dorado Middle SchoolD+
Middle · Grades 6–8 · 0.7 mi
H
Concord High SchoolC+
High · Grades 9–12 · 0.7 mi

District: Mount Diablo Unified School District

Neighborhood · ZIP 94521These 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.96
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 100.556

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.43,000
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,071 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$121,996
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,183
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.20 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

4278 Mercer Ct 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 91% of homes in East Concord
  • Costs more per square foot than 71% of homes in East Concord
  • Smaller than 91% of homes in East Concord
  • Has a smaller lot than 72% of homes in East Concord
  • Older than 78% of homes in Concord 94521

What homes are worth in Concord 94521

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

This home
$276K$1.5M

This home is worth more than 18% of homes in Concord 94521.

How it measures up in Concord 94521

The dot is this home. The mark in the middle is the typical home in Concord 94521.

Estimated value$482,256
CheaperTypical $726,764Pricier

Pricier than 18% of homes nearby

Price per ft²$450
CheaperTypical $439Pricier

Pricier than 57% of homes nearby

Living area1,071 ft²
SmallerTypical 1,588 ft²Bigger

Bigger than 13% of homes nearby

Lot size0.17 ac
SmallerTypical 0.17 acBigger

Bigger than 52% of homes nearby

Year built1961
OlderTypical 1972Newer

Newer than 22% of homes nearby

How 4278 Mercer Ct ranks against every home in each area.
MeasureThis homeEast ConcordConcord 94521Contra Costa County
Estimated valuepricier than$482,2569% of homes18% of homes15% of homes
Price per ft²pricier than$45071% of homes57% of homes49% of homes
Living areabigger than1,071 ft²9% of homes13% of homes13% of homes
Lot sizebigger than0.17 ac28% of homes52% of homes58% of homes
Year builtnewer than196131% of homes22% of homes27% of homes

About 4278 Mercer Ct

How much is 4278 Mercer Ct, Concord, CA worth?

The TopHap Estimate for 4278 Mercer Ct, Concord, CA is $482,256 as of Aug 30, 2026. The likely range is $437,023 to $527,489. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4278 Mercer Ct, Concord, CA last sell?

4278 Mercer Ct, Concord, CA last sold on Jan 31, 1996 for $138,000, according to the county's recorded deed.

How big is 4278 Mercer Ct, Concord, CA?

4278 Mercer Ct, Concord, CA has 3 bedrooms, 2 bathrooms, 1,071 square feet of living space and a 0.17-acre lot.

When was 4278 Mercer Ct, Concord, CA built?

4278 Mercer Ct, Concord, CA was built in 1961, making it 65 years old. The building has 1 story.

What schools serve 4278 Mercer Ct, Concord, CA?

4278 Mercer Ct, Concord, CA is assigned to Mountain View Elementary School (elementary), rated B; El Dorado Middle School (middle), rated D+; Concord High School (high), rated C+. All sit in Mount Diablo Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4278 Mercer Ct, Concord, CA compare to other homes in Concord 94521?

Among the 14,273 homes in Concord 94521, it is worth more than 18% of them ($482,256 against a typical $726,764), its price per square foot is higher than 57% of them ($450 against a typical $439), it is bigger than 13% of them (1,071 ft² against a typical 1,588 ft²), its lot is bigger than 52% of them (0.17 ac against a typical 0.17 ac) and it is newer than 22% of them (1961 against a typical 1972). Measured against all of Contra Costa County, it is worth more than 15% 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 4278 Mercer Ct, Concord, CA?

The 2025 property tax bill for 4278 Mercer Ct, Concord, CA was $3,542. The county assessed it at $233,803.

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