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Single Family ResidenceResidential
$689,010$445 / 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 Sep 24, 2026
Last sold for $189,900 on Aug 3, 1999

440 PROSPECT ST

LYONS, CO 80540
2
Beds
1
Baths
1,548 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.
0.32 ac
Lot SizeThe size of the land the home sits on, from county records.
1956
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
4
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

$689K
$629K low$749K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$189,900 · Aug 3, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,459 (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.$35,653 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$5,719
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$29,934
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$32,769
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$524,300

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.98 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.1965
Lot (acres)The size of the land the home sits on, from county records.0.32
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Hot Water
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
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.Porch · 177 ft²

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

E
Lyons Elementary SchoolA+
Elementary · Grades PK–5 · 0.4 mi
M
Lyons Middle / Senior High SchoolA
Middle · Grades 6–12 · 0.6 mi

District: St. Vrain Valley School District Re 1j

Neighborhood · ZIP 80540These 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.157
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.54

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.72%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.0%
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.3,726
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.23 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,918
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$148,576
Average tempThe average temperature here across a full year.41°F
Annual precipHow much rain and melted snow falls here in a typical year.22 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

440 Prospect 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 82% of homes in Lyons
  • Smaller than 71% of homes in Lyons
  • Has a bigger lot than 77% of homes in Boulder County
  • Older than 90% of homes in Boulder County

What homes are worth in Lyons 80540

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

This home
$252K$1.8M

This home is worth more than 35% of homes in Lyons 80540.

How it measures up in Lyons 80540

The dot is this home. The mark in the middle is the typical home in Lyons 80540.

Estimated value$689,010
CheaperTypical $802,625Pricier

Pricier than 35% of homes nearby

Price per ft²$445
CheaperTypical $457Pricier

Pricier than 47% of homes nearby

Living area1,548 ft²
SmallerTypical 1,724 ft²Bigger

Bigger than 42% of homes nearby

Lot size0.32 ac
SmallerTypical 0.73 acBigger

Bigger than 32% of homes nearby

Year built1956
OlderTypical 1979Newer

Newer than 18% of homes nearby

How 440 Prospect St ranks against every home in each area.
MeasureThis homeLyonsLyons 80540Boulder County
Estimated valuepricier than$689,01018% of homes35% of homes46% of homes
Price per ft²pricier than$44552% of homes47% of homes64% of homes
Living areabigger than1,548 ft²29% of homes42% of homes35% of homes
Lot sizebigger than0.32 ac53% of homes32% of homes77% of homes
Year builtnewer than195620% of homes18% of homes10% of homes

About 440 Prospect St

How much is 440 Prospect St, Lyons, CO worth?

The TopHap Estimate for 440 Prospect St, Lyons, CO is $689,010 as of Sep 24, 2026. The likely range is $629,355 to $748,665. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 440 Prospect St, Lyons, CO last sell?

440 Prospect St, Lyons, CO last sold on Aug 3, 1999 for $189,900, according to the county's recorded deed.

How big is 440 Prospect St, Lyons, CO?

440 Prospect St, Lyons, CO has 2 bedrooms, 1 bathrooms, 1,548 square feet of living space and a 0.32-acre lot.

When was 440 Prospect St, Lyons, CO built?

440 Prospect St, Lyons, CO was built in 1956, making it 70 years old. It is a ranch home. The building has 1 story.

What schools serve 440 Prospect St, Lyons, CO?

440 Prospect St, Lyons, CO is assigned to Lyons Elementary School (elementary), rated A+; Lyons Middle / Senior High School (middle), 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 440 Prospect St, Lyons, CO compare to other homes in Lyons 80540?

Among the 2,476 homes in Lyons 80540, it is worth more than 35% of them ($689,010 against a typical $802,625), its price per square foot is higher than 47% of them ($445 against a typical $457), it is bigger than 42% of them (1,548 ft² against a typical 1,724 ft²), its lot is bigger than 32% of them (0.32 ac against a typical 0.73 ac) and it is newer than 18% of them (1956 against a typical 1979). Measured against all of Boulder County, it is worth more than 46% 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 440 Prospect St, Lyons, CO?

The 2025 property tax bill for 440 Prospect St, Lyons, CO was $4,459. The county assessed it at $35,653.

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