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Single Family ResidenceResidential
$3,276,502$726 / 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 92How 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 $1,830,000 on Sep 18, 2020

3121 MAINWAY DR

LOS ALAMITOS, CA 90720
6
Beds
4.5
Baths
4,515 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
2000
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

$3.3M
$3M low$3.5M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,830,000 · Sep 18, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$22,330 (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.$2,020,467 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,253,860
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$766,607
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,980,850

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyORANGE
Lot (acres)The size of the land the home sits on, from county records.0.18
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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
Hopkinson Elementary SchoolA+
Elementary · Grades KG–5 · 0.6 mi
M
Oak Middle SchoolA+
Middle · Grades 6–8 · 1.5 mi
H
Los Alamitos High SchoolA
High · Grades 9–12 · 1.9 mi

District: Los Alamitos Unified School District

Neighborhood · ZIP 90720These 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.64
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.370

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.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.21,327
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,707 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$132,372
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$182,538
Average tempThe average temperature here across a full year.63°F
Annual precipHow much rain and melted snow falls here in a typical year.12 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.75%

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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

3121 Mainway Dr 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 Rossmoor
  • Costs more per square foot than 66% of homes in Orange County
  • Bigger than 97% of homes in Rossmoor
  • Has a bigger lot than 74% of homes in Orange County
  • Newer than 86% of homes in Rossmoor

What homes are worth in Los Alamitos 90720

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

This home
$700K$2.9M

This home is worth more than almost all homes in Los Alamitos 90720.

How it measures up in Los Alamitos 90720

The dot is this home. The mark in the middle is the typical home in Los Alamitos 90720.

Estimated value$3,276,502
CheaperTypical $1,390,112Pricier

Pricier than almost all homes nearby

Price per ft²$726
CheaperTypical $690Pricier

Pricier than 61% of homes nearby

Living area4,515 ft²
SmallerTypical 1,976 ft²Bigger

Bigger than 97% of homes nearby

Lot size0.18 ac
SmallerTypical 0.18 acBigger

Bigger than 61% of homes nearby

Year built2000
OlderTypical 1960Newer

Newer than 82% of homes nearby

How 3121 Mainway Dr ranks against every home in each area.
MeasureThis homeRossmoorLos Alamitos 90720Orange County
Estimated valuepricier than$3,276,502almost all homesalmost all homes95% of homes
Price per ft²pricier than$72644% of homes61% of homes66% of homes
Living areabigger than4,515 ft²97% of homes97% of homes97% of homes
Lot sizebigger than0.18 ac54% of homes61% of homes74% of homes
Year builtnewer than200086% of homes82% of homes86% of homes

About 3121 Mainway Dr

How much is 3121 Mainway Dr, Los Alamitos, CA worth?

The TopHap Estimate for 3121 Mainway Dr, Los Alamitos, CA is $3,276,502 as of Sep 24, 2026. The likely range is $3,012,205 to $3,540,799. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3121 Mainway Dr, Los Alamitos, CA last sell?

3121 Mainway Dr, Los Alamitos, CA last sold on Sep 18, 2020 for $1,830,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 3121 Mainway Dr, Los Alamitos, CA?

3121 Mainway Dr, Los Alamitos, CA has 6 bedrooms, 4.5 bathrooms, 4,515 square feet of living space and a 0.18-acre lot.

When was 3121 Mainway Dr, Los Alamitos, CA built?

3121 Mainway Dr, Los Alamitos, CA was built in 2000, making it 26 years old. The building has 1 story.

What schools serve 3121 Mainway Dr, Los Alamitos, CA?

3121 Mainway Dr, Los Alamitos, CA is assigned to Hopkinson Elementary School (elementary), rated A+; Oak Middle School (middle), rated A+; Los Alamitos High School (high), rated A. All sit in Los Alamitos Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3121 Mainway Dr, Los Alamitos, CA compare to other homes in Los Alamitos 90720?

Among the 6,558 homes in Los Alamitos 90720, it is worth more than almost all of them ($3,276,502 against a typical $1,390,112), its price per square foot is higher than 61% of them ($726 against a typical $690), it is bigger than 97% of them (4,515 ft² against a typical 1,976 ft²), its lot is bigger than 61% of them (0.18 ac against a typical 0.18 ac) and it is newer than 82% of them (2000 against a typical 1960). Measured against all of Orange County, it is worth more than 95% 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 3121 Mainway Dr, Los Alamitos, CA?

The 2025 property tax bill for 3121 Mainway Dr, Los Alamitos, CA was $22,330. The county assessed it at $2,020,467.

More homes on Mainway Dr

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Assigned schools

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