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Single Family ResidenceResidential
$422,233$286 / 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 98How 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 $450,000 on Mar 27, 2023

9864 COOK ST

THORNTON, CO 80229
3
Beds
2
Baths
1,476 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.
1984
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$422K
$412K low$432K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$450,000 · Mar 27, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,148 (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.$27,070 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$5,630
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$21,440
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$31,560
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$433,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyAdams
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.2016
Lot (acres)The size of the land the home sits on, from county records.0.18
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.Yes
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

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.

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

E
Explore ElementaryD
Elementary · Grades KG–6 · 0.8 mi
M
York International (K-12)C
Middle · Grades KG–12 · 0.9 mi

District: Mapleton School District 1

Neighborhood · ZIP 80229These 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.113
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.91
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.43

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.15%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.55,473
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,191 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$72,986
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$89,658
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.14 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

9864 Cook St 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 68% of homes in Adams County
  • Bigger than 68% of homes in Denver 80229
  • Has a bigger lot than 71% of homes in Denver 80229
  • Older than 66% of homes in North Hills

What homes are worth in Denver 80229

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

This home
$239K$602K

This home is worth more than 62% of homes in Denver 80229.

How it measures up in Denver 80229

The dot is this home. The mark in the middle is the typical home in Denver 80229.

Estimated value$422,233
CheaperTypical $397,598Pricier

Pricier than 62% of homes nearby

Price per ft²$286
CheaperTypical $287Pricier

Pricier than 50% of homes nearby

Living area1,476 ft²
SmallerTypical 1,232 ft²Bigger

Bigger than 68% of homes nearby

Lot size0.18 ac
SmallerTypical 0.16 acBigger

Bigger than 71% of homes nearby

Year built1984
OlderTypical 1982Newer

Newer than 56% of homes nearby

How 9864 Cook St ranks against every home in each area.
MeasureThis homeNorth HillsDenver 80229Adams County
Estimated valuepricier than$422,23337% of homes62% of homes32% of homes
Price per ft²pricier than$28637% of homes50% of homes47% of homes
Living areabigger than1,476 ft²64% of homes68% of homes44% of homes
Lot sizebigger than0.18 ac52% of homes71% of homes64% of homes
Year builtnewer than198434% of homes56% of homes42% of homes

About 9864 Cook St

How much is 9864 Cook St, Thornton, CO worth?

The TopHap Estimate for 9864 Cook St, Thornton, CO is $422,233 as of Aug 30, 2026. The likely range is $412,289 to $432,177. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9864 Cook St, Thornton, CO last sell?

9864 Cook St, Thornton, CO last sold on Mar 27, 2023 for $450,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 9864 Cook St, Thornton, CO?

9864 Cook St, Thornton, CO has 3 bedrooms, 2 bathrooms, 1,476 square feet of living space and a 0.18-acre lot.

When was 9864 Cook St, Thornton, CO built?

9864 Cook St, Thornton, CO was built in 1984, making it 42 years old. The building has 2 stories.

What schools serve 9864 Cook St, Thornton, CO?

9864 Cook St, Thornton, CO is assigned to Explore Elementary (elementary), rated D; York International (K-12) (middle), rated C. All sit in Mapleton School District 1. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9864 Cook St, Thornton, CO compare to other homes in Denver 80229?

Among the 15,510 homes in Denver 80229, it is worth more than 62% of them ($422,233 against a typical $397,598), its price per square foot is higher than 50% of them ($286 against a typical $287), it is bigger than 68% of them (1,476 ft² against a typical 1,232 ft²), its lot is bigger than 71% of them (0.18 ac against a typical 0.16 ac) and it is newer than 56% of them (1984 against a typical 1982). Measured against all of Adams County, it is worth more than 32% 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 9864 Cook St, Thornton, CO?

The 2025 property tax bill for 9864 Cook St, Thornton, CO was $1,148. The county assessed it at $27,070.

More homes on Cook St

Closest homes

More homes in Thornton 80229

Assigned schools

Explore the area

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