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Residential (General/Single)Residential
$1,056,884$236 / 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 91How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026

821 KOBY CIR

PROSPER, TX 75078
5
Beds
4.5
Baths
4,478 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.
0.34 ac
Lot SizeThe size of the land the home sits on, from county records.
2017
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.1M
$966K low$1.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$18,140 (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.$1,008,227 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$243,750
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$764,477
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$930,409
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,008,227

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Residential (General/Single)
CountyCOLLIN
Lot (acres)The size of the land the home sits on, from county records.0.34
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.Central
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
PoolWhether the property has a pool, and what kind, such as in-ground.No

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

E
Hall Elementary SchoolA+
Elementary · Grades KG–5 · 0.4 mi
M
Pete Moseley Middle School
Middle · Grades 6–8 · 2.0 mi
H
Prosper High SchoolA
High · Grades 9–12 · 2.1 mi

District: Prosper Independent School District

Neighborhood · ZIP 75078These 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.49
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.29

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.41%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.2%
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.49,045
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,435 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$166,233
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$200,017
Average tempThe average temperature here across a full year.64°F
Annual precipHow much rain and melted snow falls here in a typical year.40 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.62%

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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

821 Koby Cir 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 more than 94% of homes in Collin County
  • Costs more per square foot than 77% of homes in Collin County
  • Bigger than 95% of homes in Collin County
  • Has a bigger lot than 87% of homes in Collin County
  • Newer than 76% of homes in Collin County

What homes are worth in Prosper 75078

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

This home
$364K$1.7M

This home is worth more than 85% of homes in Prosper 75078.

How it measures up in Prosper 75078

The dot is this home. The mark in the middle is the typical home in Prosper 75078.

Estimated value$1,056,884
CheaperTypical $750,000Pricier

Pricier than 85% of homes nearby

Price per ft²$236
CheaperTypical $224Pricier

Pricier than 62% of homes nearby

Living area4,478 ft²
SmallerTypical 3,422 ft²Bigger

Bigger than 88% of homes nearby

Lot size0.34 ac
SmallerTypical 0.23 acBigger

Bigger than 81% of homes nearby

Year built2017
OlderTypical 2018Newer

Newer than 46% of homes nearby

How 821 Koby Cir ranks against every home in each area.
MeasureThis homeProsper 75078Collin County
Estimated valuepricier than$1,056,88485% of homes94% of homes
Price per ft²pricier than$23662% of homes77% of homes
Living areabigger than4,478 ft²88% of homes95% of homes
Lot sizebigger than0.34 ac81% of homes87% of homes
Year builtnewer than201746% of homes76% of homes

About 821 Koby Cir

How much is 821 Koby Cir, Prosper, TX worth?

The TopHap Estimate for 821 Koby Cir, Prosper, TX is $1,056,884 as of Oct 21, 2026. The likely range is $966,463 to $1,147,305. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 821 Koby Cir, Prosper, TX last sell?

821 Koby Cir, Prosper, TX last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 821 Koby Cir, Prosper, TX?

821 Koby Cir, Prosper, TX has 5 bedrooms, 4.5 bathrooms, 4,478 square feet of living space and a 0.34-acre lot.

When was 821 Koby Cir, Prosper, TX built?

821 Koby Cir, Prosper, TX was built in 2017, making it 9 years old. The building has 2 stories.

What schools serve 821 Koby Cir, Prosper, TX?

821 Koby Cir, Prosper, TX is assigned to Hall Elementary School (elementary), rated A+; Pete Moseley Middle School (middle); Prosper High School (high), rated A. All sit in Prosper Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 821 Koby Cir, Prosper, TX compare to other homes in Prosper 75078?

Among the 19,944 homes in Prosper 75078, it is worth more than 85% of them ($1,056,884 against a typical $750,000), its price per square foot is higher than 62% of them ($236 against a typical $224), it is bigger than 88% of them (4,478 ft² against a typical 3,422 ft²), its lot is bigger than 81% of them (0.34 ac against a typical 0.23 ac) and it is newer than 46% of them (2017 against a typical 2018). Measured against all of Collin County, it is worth more than 94% 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 821 Koby Cir, Prosper, TX?

The 2025 property tax bill for 821 Koby Cir, Prosper, TX was $18,140. The county assessed it at $1,008,227.

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