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Single Family ResidenceResidential
$309,082$260 / 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 $310,000 on Mar 6, 2025

527 DIANE ST SW

CASTLE ROCK, WA 98611
3
Beds
1
Baths
1,188 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.
1980
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$309K
$285K low$333K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$310,000 · Mar 6, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,462 (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.$294,070 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$50,930
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$243,140
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$290,530
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$294,070

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.54 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.minimal

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
CountyCOWLITZ
Lot (acres)The size of the land the home sits on, from county records.0.18
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Electric
CoolingThe type of cooling or air conditioning in the home.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(6)

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.

M
Castle Rock Middle SchoolC-
Middle · Grades 6–8 · 0.3 mi
E
Castle Rock Elementary SchoolD+
Elementary · Grades PK–5 · 0.4 mi
H
Castle Rock High SchoolD+
High · Grades 9–12 · 0.9 mi

District: Castle Rock School District

Neighborhood · ZIP 98611These 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.85
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 100.172

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.12%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.0%
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.10,313
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.84 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$81,330
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$96,543
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.61 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.35%

Owner Tools

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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

527 Diane St Sw 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 87% of homes in Castle Rock 98611
  • Costs less per square foot than 67% of homes in Castle Rock 98611
  • Smaller than 77% of homes in Castle Rock 98611
  • Has a smaller lot than 93% of homes in Castle Rock 98611

What homes are worth in Castle Rock 98611

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

This home
$222K$890K

This home is worth more than 13% of homes in Castle Rock 98611.

How it measures up in Castle Rock 98611

The dot is this home. The mark in the middle is the typical home in Castle Rock 98611.

Estimated value$309,082
CheaperTypical $469,025Pricier

Pricier than 13% of homes nearby

Price per ft²$260
CheaperTypical $290Pricier

Pricier than 33% of homes nearby

Living area1,188 ft²
SmallerTypical 1,578 ft²Bigger

Bigger than 23% of homes nearby

Lot size0.18 ac
SmallerTypical 2.61 acBigger

Bigger than 7% of homes nearby

Year built1980
OlderTypical 1980Newer

Newer than 50% of homes nearby

How 527 Diane St Sw ranks against every home in each area.
MeasureThis homeCastle Rock 98611Cowlitz County
Estimated valuepricier than$309,08213% of homes19% of homes
Price per ft²pricier than$26033% of homes38% of homes
Living areabigger than1,188 ft²23% of homes28% of homes
Lot sizebigger than0.18 ac7% of homes20% of homes
Year builtnewer than198050% of homes58% of homes

About 527 Diane St Sw

How much is 527 Diane St Sw, Castle Rock, WA worth?

The TopHap Estimate for 527 Diane St Sw, Castle Rock, WA is $309,082 as of Sep 24, 2026. The likely range is $284,844 to $333,320. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 527 Diane St Sw, Castle Rock, WA last sell?

527 Diane St Sw, Castle Rock, WA last sold on Mar 6, 2025 for $310,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 527 Diane St Sw, Castle Rock, WA?

527 Diane St Sw, Castle Rock, WA has 3 bedrooms, 1 bathrooms, 1,188 square feet of living space and a 0.18-acre lot.

When was 527 Diane St Sw, Castle Rock, WA built?

527 Diane St Sw, Castle Rock, WA was built in 1980, making it 46 years old. The building has 1 story.

What schools serve 527 Diane St Sw, Castle Rock, WA?

527 Diane St Sw, Castle Rock, WA is assigned to Castle Rock Middle School (middle), rated C-; Castle Rock Elementary School (elementary), rated D+; Castle Rock High School (high), rated D+. All sit in Castle Rock School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 527 Diane St Sw, Castle Rock, WA compare to other homes in Castle Rock 98611?

Among the 4,435 homes in Castle Rock 98611, it is worth more than 13% of them ($309,082 against a typical $469,025), its price per square foot is higher than 33% of them ($260 against a typical $290), it is bigger than 23% of them (1,188 ft² against a typical 1,578 ft²), its lot is bigger than 7% of them (0.18 ac against a typical 2.61 ac) and it is newer than 50% of them (1980 against a typical 1980). Measured against all of Cowlitz County, it is worth more than 19% 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 527 Diane St Sw, Castle Rock, WA?

The 2025 property tax bill for 527 Diane St Sw, Castle Rock, WA was $2,462. The county assessed it at $294,070.

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