Skip to content
Skip to content
TopHapOpen in map
CondominiumResidential
$305,000$217 / 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 89How 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 $270,000 on Apr 27, 2021

8666 MARIPOSA ST

THORNTON, CO 80260
3
Beds
2
Baths
1,408 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.
1 ac
Lot SizeThe size of the land the home sits on, from county records.
1966
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
5
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

$305K
$272K low$338K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$270,000 · Apr 27, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$752 (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.$15,810 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$3,810
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$12,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$17,420
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$253,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
CountyAdams
Lot (acres)The size of the land the home sits on, from county records.1.00
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.Forced Air
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.Carport (Unspecified)

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.

E
North Star Elementary SchoolD-
Elementary · Grades PK–5 · 0.5 mi
M
Thornton Middle SchoolD+
Middle · Grades 6–8 · 1.6 mi
H
Northglenn High SchoolA-
High · Grades 9–12 · 1.8 mi

District: Northglenn-Thornton School District 12

Neighborhood · ZIP 80260These 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.106
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 100.48

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.9.7%
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.1.7%
PopulationHow many people live in this area.37,809
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,877 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$58,448
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$72,182
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.15 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

Owner Tools

Do you own this home?
Claim this home

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

8666 Mariposa 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 94% of homes in Adams County
  • Costs less per square foot than 92% of homes in Adams County
  • Bigger than 72% of homes in Denver 80260
  • Has a bigger lot than 93% of homes in Adams County
  • Older than 88% of homes in Denver 80260

What homes are worth in Denver 80260

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

This home
$127K$541K

This home is worth more than 28% of homes in Denver 80260.

How it measures up in Denver 80260

The dot is this home. The mark in the middle is the typical home in Denver 80260.

Estimated value$305,000
CheaperTypical $390,861Pricier

Pricier than 28% of homes nearby

Price per ft²$217
CheaperTypical $267Pricier

Pricier than 18% of homes nearby

Living area1,408 ft²
SmallerTypical 1,216 ft²Bigger

Bigger than 72% of homes nearby

Lot size1 ac
SmallerTypical 0.25 acBigger

Bigger than 66% of homes nearby

Year built1966
OlderTypical 1982Newer

Newer than 12% of homes nearby

How 8666 Mariposa St ranks against every home in each area.
MeasureThis homeDenver 80260Adams County
Estimated valuepricier than$305,00028% of homes6% of homes
Price per ft²pricier than$21718% of homes8% of homes
Living areabigger than1,408 ft²72% of homes39% of homes
Lot sizebigger than1 ac66% of homes93% of homes
Year builtnewer than196612% of homes22% of homes

About 8666 Mariposa St

How much is 8666 Mariposa St, Thornton, CO worth?

The TopHap Estimate for 8666 Mariposa St, Thornton, CO is $305,000 as of Sep 24, 2026. The likely range is $271,764 to $338,236. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 8666 Mariposa St, Thornton, CO last sell?

8666 Mariposa St, Thornton, CO last sold on Apr 27, 2021 for $270,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 8666 Mariposa St, Thornton, CO?

8666 Mariposa St, Thornton, CO has 3 bedrooms, 2 bathrooms, 1,408 square feet of living space and a 1.00-acre lot.

When was 8666 Mariposa St, Thornton, CO built?

8666 Mariposa St, Thornton, CO was built in 1966, making it 60 years old. The building has 2 stories.

What schools serve 8666 Mariposa St, Thornton, CO?

8666 Mariposa St, Thornton, CO is assigned to North Star Elementary School (elementary), rated D-; Thornton Middle School (middle), rated D+; Northglenn High School (high), rated A-. All sit in Northglenn-Thornton School District 12. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 8666 Mariposa St, Thornton, CO compare to other homes in Denver 80260?

Among the 10,117 homes in Denver 80260, it is worth more than 28% of them ($305,000 against a typical $390,861), its price per square foot is higher than 18% of them ($217 against a typical $267), it is bigger than 72% of them (1,408 ft² against a typical 1,216 ft²), its lot is bigger than 66% of them (1 ac against a typical 0.25 ac) and it is newer than 12% of them (1966 against a typical 1982). Measured against all of Adams County, it is worth more than 6% 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 8666 Mariposa St, Thornton, CO?

The 2025 property tax bill for 8666 Mariposa St, Thornton, CO was $752. The county assessed it at $15,810.

More homes on Mariposa St

Closest homes

More homes in Thornton 80260

Assigned schools

Explore the area

See this home in context

Open 8666 Mariposa St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map