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Single Family ResidenceResidential
$1,326,682$383 / 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 93How 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 $631,000 on Apr 23, 2009

6421 ROBIN DR

LONGMONT, CO 80503
4
Beds
2.8
Baths
3,460 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.
1.31 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.
1
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.
4
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.3M
$1.2M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$631,000 · Apr 23, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,532 (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.$85,551 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$37,434
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$48,117
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$78,631
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,258,100

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.73 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.1 percent flood zone

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
CountyBOULDER
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.1982
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.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Central
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 372 ft²

Transaction History(2)

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
Blue Mountain Elementary SchoolA-
Elementary · Grades PK–5 · 3.0 mi
M
Altona Middle SchoolA
Middle · Grades 6–8 · 3.4 mi
H
Silver Creek High SchoolA-
High · Grades 9–12 · 3.6 mi

District: St. Vrain Valley School District Re 1j

Neighborhood · ZIP 80503These 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.68
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.93
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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.36%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.0%
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.35,912
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.383 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$119,092
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$150,122
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.17 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

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

6421 Robin Dr 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 85% of homes in Longmont 80503
  • Costs more per square foot than 73% of homes in Longmont 80503
  • Bigger than 87% of homes in Boulder County
  • Has a bigger lot than 91% of homes in Boulder County
  • Older than 95% of homes in Longmont 80503

What homes are worth in Longmont 80503

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

This home
$358K$2.7M

This home is worth more than 85% of homes in Longmont 80503.

How it measures up in Longmont 80503

The dot is this home. The mark in the middle is the typical home in Longmont 80503.

Estimated value$1,326,682
CheaperTypical $739,446Pricier

Pricier than 85% of homes nearby

Price per ft²$383
CheaperTypical $330Pricier

Pricier than 73% of homes nearby

Living area3,460 ft²
SmallerTypical 2,372 ft²Bigger

Bigger than 79% of homes nearby

Lot size1.31 ac
SmallerTypical 0.2 acBigger

Bigger than 90% of homes nearby

Year built1966
OlderTypical 1993Newer

Newer than 5% of homes nearby

How 6421 Robin Dr ranks against every home in each area.
MeasureThis homeLongmont 80503Boulder County
Estimated valuepricier than$1,326,68285% of homes84% of homes
Price per ft²pricier than$38373% of homes48% of homes
Living areabigger than3,460 ft²79% of homes87% of homes
Lot sizebigger than1.31 ac90% of homes91% of homes
Year builtnewer than19665% of homes20% of homes

About 6421 Robin Dr

How much is 6421 Robin Dr, Longmont, CO worth?

The TopHap Estimate for 6421 Robin Dr, Longmont, CO is $1,326,682 as of Aug 30, 2026. The likely range is $1,237,660 to $1,415,704. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 6421 Robin Dr, Longmont, CO last sell?

6421 Robin Dr, Longmont, CO last sold on Apr 23, 2009 for $631,000, according to the county's recorded deed.

How big is 6421 Robin Dr, Longmont, CO?

6421 Robin Dr, Longmont, CO has 4 bedrooms, 2.8 bathrooms and 3,460 square feet of living space.

When was 6421 Robin Dr, Longmont, CO built?

6421 Robin Dr, Longmont, CO was built in 1966, making it 60 years old. It is a ranch home. The building has 1 story.

What schools serve 6421 Robin Dr, Longmont, CO?

6421 Robin Dr, Longmont, CO is assigned to Blue Mountain Elementary School (elementary), rated A-; Altona Middle School (middle), rated A; Silver Creek High School (high), rated A-. All sit in St. Vrain Valley School District Re 1j. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 6421 Robin Dr, Longmont, CO compare to other homes in Longmont 80503?

Among the 11,721 homes in Longmont 80503, it is worth more than 85% of them ($1,326,682 against a typical $739,446), its price per square foot is higher than 73% of them ($383 against a typical $330), it is bigger than 79% of them (3,460 ft² against a typical 2,372 ft²), its lot is bigger than 90% of them (1.31 ac against a typical 0.2 ac) and it is newer than 5% of them (1966 against a typical 1993). Measured against all of Boulder County, it is worth more than 84% 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 6421 Robin Dr, Longmont, CO?

The 2025 property tax bill for 6421 Robin Dr, Longmont, CO was $8,532. The county assessed it at $85,551.

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