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Single Family ResidenceResidential
$385,659$567 / 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 63How 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 $445,000 on Feb 28, 2022

51831 S RIVERSIDE RD

INDEX, WA 98256
1
Beds
1
Baths
680 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.
3,485 ft²
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.
3
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$386K
$245K low$526K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$445,000 · Feb 28, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,870 (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.$431,200 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$333,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$97,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$384,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$431,200

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.28
87
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
29
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
26
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.107 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.1 percent flood zone

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
CountySNOHOMISH
Lot (acres)The size of the land the home sits on, from county records.0.08
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.No Foundation
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Floor/Wall Furnace
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 210 ft²Patio · 210 ft²Porch · 120 ft²

Transaction History(2)

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
Index Elementary SchoolB-
Elementary · Grades PK–8 · 1.7 mi
H
Sultan High SchoolC
High · Grades 9–12 · 13.8 mi

District: Index School District

Neighborhood · ZIP 98256These 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.195
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.190

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.54%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.9.2%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.12%
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.258
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$61,752
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$75,809
Average tempThe average temperature here across a full year.41°F
Annual precipHow much rain and melted snow falls here in a typical year.127 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.43%

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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

51831 S Riverside Rd 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 95% of homes in Snohomish County
  • Costs more per square foot than 93% of homes in Snohomish County
  • Smaller than 98% of homes in Snohomish County
  • Has a smaller lot than 97% of homes in Mt. Index Riversites
  • Older than 85% of homes in Snohomish County

What homes are worth in Index 98256

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

This home
$268K$1.1M

This home is worth more than 14% of homes in Index 98256.

How it measures up in Index 98256

The dot is this home. The mark in the middle is the typical home in Index 98256.

Estimated value$385,659
CheaperTypical $478,260Pricier

Pricier than 14% of homes nearby

Price per ft²$567
CheaperTypical $488Pricier

Pricier than 68% of homes nearby

Living area680 ft²
SmallerTypical 864 ft²Bigger

Bigger than 31% of homes nearby

Lot size3,485 ft²
SmallerTypical 0.27 acBigger

Bigger than 4% of homes nearby

Year built1961
OlderTypical 1967Newer

Newer than 39% of homes nearby

How 51831 S Riverside Rd ranks against every home in each area.
MeasureThis homeMt. Index RiversitesIndex 98256Snohomish County
Estimated valuepricier than$385,65929% of homes14% of homes5% of homes
Price per ft²pricier than$56750% of homes68% of homes93% of homes
Living areabigger than680 ft²66% of homes31% of homes2% of homes
Lot sizebigger than3,485 ft²3% of homes4% of homes8% of homes
Year builtnewer than196127% of homes39% of homes15% of homes

About 51831 S Riverside Rd

How much is 51831 S Riverside Rd, Index, WA worth?

The TopHap Estimate for 51831 S Riverside Rd, Index, WA is $385,659 as of Sep 24, 2026. The likely range is $244,888 to $526,430. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 51831 S Riverside Rd, Index, WA last sell?

51831 S Riverside Rd, Index, WA last sold on Feb 28, 2022 for $445,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 51831 S Riverside Rd, Index, WA?

51831 S Riverside Rd, Index, WA has 1 bedrooms, 1 bathrooms, 680 square feet of living space and a 0.08-acre lot.

When was 51831 S Riverside Rd, Index, WA built?

51831 S Riverside Rd, Index, WA was built in 1961, making it 65 years old. The building has 1 story.

What schools serve 51831 S Riverside Rd, Index, WA?

51831 S Riverside Rd, Index, WA is assigned to Index Elementary School (elementary), rated B-; Sultan High School (high), rated C. All sit in Index School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 51831 S Riverside Rd, Index, WA compare to other homes in Index 98256?

Among the 314 homes in Index 98256, it is worth more than 14% of them ($385,659 against a typical $478,260), its price per square foot is higher than 68% of them ($567 against a typical $488), it is bigger than 31% of them (680 ft² against a typical 864 ft²), its lot is bigger than 4% of them (3,485 ft² against a typical 0.27 ac) and it is newer than 39% of them (1961 against a typical 1967). Measured against all of Snohomish County, it is worth more than 5% 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 51831 S Riverside Rd, Index, WA?

The 2026 property tax bill for 51831 S Riverside Rd, Index, WA was $2,870. The county assessed it at $431,200.

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