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Residential (General/Single)Residential
$341,064$229 / 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 87How 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 $132,500 on Oct 26, 2010

21042 NIAGARA RIVER DR

SONORA, CA 95370
2
Beds
2
Baths
1,487 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.
0.28 ac
Lot SizeThe size of the land the home sits on, from county records.
1980
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$341K
$295K low$387K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$132,500 · Oct 26, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,812 (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.$173,135 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$65,333
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$107,802
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$169,741
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$279,450

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Residential (General/Single)
CountyTUOLUMNE
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.1981
Lot (acres)The size of the land the home sits on, from county records.0.28
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(13)

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(4)

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

E
Soulsbyville Elementary SchoolB+
Elementary · Grades KG–8 · 1.0 mi
H
Sonora High SchoolB
High · Grades 9–12 · 6.7 mi

District: Sonora Union High School District

Neighborhood · ZIP 95370These 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.90
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.85
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.81

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.87%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.15%
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.27,153
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.246 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$76,469
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$99,345
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.35 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

21042 Niagara River 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.

  • Worth less than 66% of homes in Sonora 95370
  • Costs less per square foot than 69% of homes in Sonora 95370
  • Has a smaller lot than 81% of homes in Sonora 95370

What homes are worth in Sonora 95370

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

This home
$186K$875K

This home is worth more than 34% of homes in Sonora 95370.

How it measures up in Sonora 95370

The dot is this home. The mark in the middle is the typical home in Sonora 95370.

Estimated value$341,064
CheaperTypical $391,060Pricier

Pricier than 34% of homes nearby

Price per ft²$229
CheaperTypical $250Pricier

Pricier than 31% of homes nearby

Living area1,487 ft²
SmallerTypical 1,586 ft²Bigger

Bigger than 43% of homes nearby

Lot size0.28 ac
SmallerTypical 0.66 acBigger

Bigger than 19% of homes nearby

Year built1980
OlderTypical 1978Newer

Newer than 56% of homes nearby

How 21042 Niagara River Dr ranks against every home in each area.
MeasureThis homeSonora 95370Tuolumne County
Estimated valuepricier than$341,06434% of homes45% of homes
Price per ft²pricier than$22931% of homes38% of homes
Living areabigger than1,487 ft²43% of homes47% of homes
Lot sizebigger than0.28 ac19% of homes28% of homes
Year builtnewer than198056% of homes55% of homes

About 21042 Niagara River Dr

How much is 21042 Niagara River Dr, Sonora, CA worth?

The TopHap Estimate for 21042 Niagara River Dr, Sonora, CA is $341,064 as of Aug 30, 2026. The likely range is $295,422 to $386,706. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21042 Niagara River Dr, Sonora, CA last sell?

21042 Niagara River Dr, Sonora, CA last sold on Oct 26, 2010 for $132,500, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 21042 Niagara River Dr, Sonora, CA?

21042 Niagara River Dr, Sonora, CA has 2 bedrooms, 2 bathrooms, 1,487 square feet of living space and a 0.28-acre lot.

When was 21042 Niagara River Dr, Sonora, CA built?

21042 Niagara River Dr, Sonora, CA was built in 1980, making it 46 years old. The building has 1 story.

What schools serve 21042 Niagara River Dr, Sonora, CA?

21042 Niagara River Dr, Sonora, CA is assigned to Soulsbyville Elementary School (elementary), rated B+; Sonora High School (high), rated B. All sit in Sonora Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21042 Niagara River Dr, Sonora, CA compare to other homes in Sonora 95370?

Among the 10,859 homes in Sonora 95370, it is worth more than 34% of them ($341,064 against a typical $391,060), its price per square foot is higher than 31% of them ($229 against a typical $250), it is bigger than 43% of them (1,487 ft² against a typical 1,586 ft²), its lot is bigger than 19% of them (0.28 ac against a typical 0.66 ac) and it is newer than 56% of them (1980 against a typical 1978). Measured against all of Tuolumne County, it is worth more than 45% 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 21042 Niagara River Dr, Sonora, CA?

The 2025 property tax bill for 21042 Niagara River Dr, Sonora, CA was $1,812. The county assessed it at $173,135.

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