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Single Family ResidenceResidential
$619,770$231 / 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 $520,000 on Mar 8, 2021

3975 JOHN AVE

CASTLE ROCK, CO 80104
3
Beds
2
Baths
2,688 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
2018
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$620K
$594K low$645K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$520,000 · Mar 8, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,738 (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.$41,410 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$10,760
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$30,650
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$41,410
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$609,004

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.53
38
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
55
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
67
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
32
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
75
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.7 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
StyleThe architectural style of the home, such as ranch or colonial.Ranch
CountyDOUGLAS
Lot (acres)The size of the land the home sits on, from county records.0.11
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
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.Porch · 154 ft²

Transaction History(5)

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
South Ridge Elementary SchoolB
Elementary · Grades KG–6 · 2.3 mi
M
Mesa Middle SchoolC+
Middle · Grades 7–8 · 3.5 mi
H
Douglas County High SchoolB+
High · Grades 9–12 · 3.8 mi

District: Douglas County School District Re-1

Neighborhood · ZIP 80104These 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.110
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.45

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.6%
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.38,110
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.454 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$116,677
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$145,634
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.20 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

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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

3975 John Ave 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 72% of homes in Crystal Valley Ranch
  • Costs less per square foot than 83% of homes in Douglas County
  • Has a smaller lot than 88% of homes in Crystal Valley Ranch
  • Newer than 83% of homes in Douglas County

What homes are worth in Castle Rock 80104

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

This home
$309K$1.5M

This home is worth more than 53% of homes in Castle Rock 80104.

How it measures up in Castle Rock 80104

The dot is this home. The mark in the middle is the typical home in Castle Rock 80104.

Estimated value$619,770
CheaperTypical $607,421Pricier

Pricier than 53% of homes nearby

Price per ft²$231
CheaperTypical $274Pricier

Pricier than 20% of homes nearby

Living area2,688 ft²
SmallerTypical 2,338 ft²Bigger

Bigger than 63% of homes nearby

Lot size0.11 ac
SmallerTypical 0.18 acBigger

Bigger than 18% of homes nearby

Year built2018
OlderTypical 2004Newer

Newer than 72% of homes nearby

How 3975 John Ave ranks against every home in each area.
MeasureThis homeCrystal Valley RanchCastle Rock 80104Douglas County
Estimated valuepricier than$619,77028% of homes53% of homes31% of homes
Price per ft²pricier than$23131% of homes20% of homes17% of homes
Living areabigger than2,688 ft²45% of homes63% of homes52% of homes
Lot sizebigger than0.11 ac12% of homes18% of homes18% of homes
Year builtnewer than201835% of homes72% of homes83% of homes

About 3975 John Ave

How much is 3975 John Ave, Castle Rock, CO worth?

The TopHap Estimate for 3975 John Ave, Castle Rock, CO is $619,770 as of Aug 30, 2026. The likely range is $594,174 to $645,366. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3975 John Ave, Castle Rock, CO last sell?

3975 John Ave, Castle Rock, CO last sold on Mar 8, 2021 for $520,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 3975 John Ave, Castle Rock, CO?

3975 John Ave, Castle Rock, CO has 3 bedrooms, 2 bathrooms, 2,688 square feet of living space and a 0.11-acre lot.

When was 3975 John Ave, Castle Rock, CO built?

3975 John Ave, Castle Rock, CO was built in 2018, making it 8 years old. It is a ranch home. The building has 1 story.

What schools serve 3975 John Ave, Castle Rock, CO?

3975 John Ave, Castle Rock, CO is assigned to South Ridge Elementary School (elementary), rated B; Mesa Middle School (middle), rated C+; Douglas County High School (high), rated B+. All sit in Douglas County School District Re-1. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3975 John Ave, Castle Rock, CO compare to other homes in Castle Rock 80104?

Among the 15,707 homes in Castle Rock 80104, it is worth more than 53% of them ($619,770 against a typical $607,421), its price per square foot is higher than 20% of them ($231 against a typical $274), it is bigger than 63% of them (2,688 ft² against a typical 2,338 ft²), its lot is bigger than 18% of them (0.11 ac against a typical 0.18 ac) and it is newer than 72% of them (2018 against a typical 2004). Measured against all of Douglas County, it is worth more than 31% 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 3975 John Ave, Castle Rock, CO?

The 2025 property tax bill for 3975 John Ave, Castle Rock, CO was $3,738. The county assessed it at $41,410.

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