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Single Family ResidenceResidential
$558,132$432 / 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 92How 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 $165,000 on Sep 21, 2000

12439 ROCK LN

LONGMONT, CO 80504
3
Beds
1.8
Baths
1,293 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.
1.02 ac
Lot SizeThe size of the land the home sits on, from county records.
1973
Year BuiltThe year the home was originally built, according to county records.
1
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$558K
$515K low$602K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$165,000 · Sep 21, 2000

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,300 (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.$39,596 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$12,988
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$26,608
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$36,394
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$582,300

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
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

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

M
Mead Middle SchoolA-
Middle · Grades 6–8 · 3.6 mi
E
Mead Elementary SchoolA
Elementary · Grades PK–5 · 3.7 mi
H
Mead High SchoolB+
High · Grades 9–12 · 3.7 mi

District: St. Vrain Valley School District Re 1j

Neighborhood · ZIP 80504These 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.67
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.99
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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.2%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.64,420
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.637 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$110,047
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$129,711
Average tempThe average temperature here across a full year.49°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

12439 Rock Ln 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 93% of homes in North Eastern Plains
  • Costs more per square foot than 95% of homes in Longmont 80504
  • Smaller than 94% of homes in North Eastern Plains
  • Has a bigger lot than 93% of homes in Longmont 80504
  • Older than 91% of homes in Longmont 80504

What homes are worth in Longmont 80504

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

This home
$320K$1.6M

This home is worth more than 45% of homes in Longmont 80504.

How it measures up in Longmont 80504

The dot is this home. The mark in the middle is the typical home in Longmont 80504.

Estimated value$558,132
CheaperTypical $573,096Pricier

Pricier than 45% of homes nearby

Price per ft²$432
CheaperTypical $278Pricier

Pricier than 95% of homes nearby

Living area1,293 ft²
SmallerTypical 2,016 ft²Bigger

Bigger than 13% of homes nearby

Lot size1.02 ac
SmallerTypical 0.17 acBigger

Bigger than 93% of homes nearby

Year built1973
OlderTypical 2002Newer

Newer than 9% of homes nearby

How 12439 Rock Ln ranks against every home in each area.
MeasureThis homeNorth Eastern PlainsLongmont 80504Boulder County
Estimated valuepricier than$558,1327% of homes45% of homes31% of homes
Price per ft²pricier than$43263% of homes95% of homes61% of homes
Living areabigger than1,293 ft²6% of homes13% of homes24% of homes
Lot sizebigger than1.02 ac37% of homes93% of homes89% of homes
Year builtnewer than197351% of homes9% of homes31% of homes

About 12439 Rock Ln

How much is 12439 Rock Ln, Longmont, CO worth?

The TopHap Estimate for 12439 Rock Ln, Longmont, CO is $558,132 as of Aug 30, 2026. The likely range is $514,530 to $601,734. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 12439 Rock Ln, Longmont, CO last sell?

12439 Rock Ln, Longmont, CO last sold on Sep 21, 2000 for $165,000, according to the county's recorded deed.

How big is 12439 Rock Ln, Longmont, CO?

12439 Rock Ln, Longmont, CO has 3 bedrooms, 1.8 bathrooms and 1,293 square feet of living space.

When was 12439 Rock Ln, Longmont, CO built?

12439 Rock Ln, Longmont, CO was built in 1973, making it 53 years old. It is a ranch home. The building has 1 story.

What schools serve 12439 Rock Ln, Longmont, CO?

12439 Rock Ln, Longmont, CO is assigned to Mead Middle School (middle), rated A-; Mead Elementary School (elementary), rated A; Mead High School (high), rated B+. All sit in St. Vrain Valley School District Re 1j. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 12439 Rock Ln, Longmont, CO compare to other homes in Longmont 80504?

Among the 21,650 homes in Longmont 80504, it is worth more than 45% of them ($558,132 against a typical $573,096), its price per square foot is higher than 95% of them ($432 against a typical $278), it is bigger than 13% of them (1,293 ft² against a typical 2,016 ft²), its lot is bigger than 93% of them (1.02 ac against a typical 0.17 ac) and it is newer than 9% of them (1973 against a typical 2002). Measured against all of Boulder 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 12439 Rock Ln, Longmont, CO?

The 2025 property tax bill for 12439 Rock Ln, Longmont, CO was $3,300. The county assessed it at $39,596.

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