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Single Family ResidenceResidential
$676,378$482 / 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 $650,000 on Apr 15, 2025

10638 PORTSMOUTH CT

RIVERSIDE, CA 92503
4
Beds
1.8
Baths
1,404 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.
0.25 ac
Lot SizeThe size of the land the home sits on, from county records.
1976
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
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

$676K
$649K low$704K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$650,000 · Apr 15, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,021 (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.$663,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$198,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$464,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$180,728
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$446,220

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.Ranch
CountyRIVERSIDE
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1977
Lot (acres)The size of the land the home sits on, from county records.0.25
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.Rock / Gravel
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
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.

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

M
Arizona Middle SchoolB-
Middle · Grades 6–8 · 0.6 mi
E
Orrenmaa Elementary SchoolC
Elementary · Grades KG–5 · 1.1 mi
H
Hillcrest High SchoolB+
High · Grades 9–12 · 1.6 mi

District: Alvord Unified School District

Neighborhood · ZIP 92503These 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.57
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.290

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.14%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.8%
PopulationHow many people live in this area.96,024
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,949 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$87,069
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$109,138
Average tempThe average temperature here across a full year.64°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.68%

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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

10638 Portsmouth 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 more than 69% of homes in Riverside 92503
  • Costs more per square foot than 93% of homes in Riverside County
  • Smaller than 73% of homes in Riverside County
  • Has a bigger lot than 72% of homes in Riverside 92503
  • Older than 80% of homes in La Sierra South

What homes are worth in Riverside 92503

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

This home
$399K$1.2M

This home is worth more than 69% of homes in Riverside 92503.

How it measures up in Riverside 92503

The dot is this home. The mark in the middle is the typical home in Riverside 92503.

Estimated value$676,378
CheaperTypical $592,256Pricier

Pricier than 69% of homes nearby

Price per ft²$482
CheaperTypical $374Pricier

Pricier than 85% of homes nearby

Living area1,404 ft²
SmallerTypical 1,540 ft²Bigger

Bigger than 41% of homes nearby

Lot size0.25 ac
SmallerTypical 0.19 acBigger

Bigger than 72% of homes nearby

Year built1976
OlderTypical 1978Newer

Newer than 43% of homes nearby

How 10638 Portsmouth Ct ranks against every home in each area.
MeasureThis homeLa Sierra SouthRiverside 92503Riverside County
Estimated valuepricier than$676,37867% of homes69% of homes67% of homes
Price per ft²pricier than$48292% of homes85% of homes93% of homes
Living areabigger than1,404 ft²37% of homes41% of homes27% of homes
Lot sizebigger than0.25 ac69% of homes72% of homes63% of homes
Year builtnewer than197620% of homes43% of homes22% of homes

About 10638 Portsmouth Ct

How much is 10638 Portsmouth Ct, Riverside, CA worth?

The TopHap Estimate for 10638 Portsmouth Ct, Riverside, CA is $676,378 as of Aug 30, 2026. The likely range is $649,216 to $703,540. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 10638 Portsmouth Ct, Riverside, CA last sell?

10638 Portsmouth Ct, Riverside, CA last sold on Apr 15, 2025 for $650,000, according to the county's recorded deed.

How big is 10638 Portsmouth Ct, Riverside, CA?

10638 Portsmouth Ct, Riverside, CA has 4 bedrooms, 1.8 bathrooms, 1,404 square feet of living space and a 0.25-acre lot.

When was 10638 Portsmouth Ct, Riverside, CA built?

10638 Portsmouth Ct, Riverside, CA was built in 1976, making it 50 years old. It is a ranch home. The building has 1 story.

What schools serve 10638 Portsmouth Ct, Riverside, CA?

10638 Portsmouth Ct, Riverside, CA is assigned to Arizona Middle School (middle), rated B-; Orrenmaa Elementary School (elementary), rated C; Hillcrest High School (high), rated B+. All sit in Alvord Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 10638 Portsmouth Ct, Riverside, CA compare to other homes in Riverside 92503?

Among the 21,420 homes in Riverside 92503, it is worth more than 69% of them ($676,378 against a typical $592,256), its price per square foot is higher than 85% of them ($482 against a typical $374), it is bigger than 41% of them (1,404 ft² against a typical 1,540 ft²), its lot is bigger than 72% of them (0.25 ac against a typical 0.19 ac) and it is newer than 43% of them (1976 against a typical 1978). Measured against all of Riverside County, it is worth more than 67% 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 10638 Portsmouth Ct, Riverside, CA?

The 2025 property tax bill for 10638 Portsmouth Ct, Riverside, CA was $8,021. The county assessed it at $663,000.

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