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Single Family ResidenceResidential
$673,981$555 / 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 90How 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

123 N MACK ST

FORT COLLINS, CO 80521
2
Beds
2
Baths
1,214 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.
0.19 ac
Lot SizeThe size of the land the home sits on, from county records.
1923
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
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

$674K
$606K low$741K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,256 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$44,314 (2024)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$6,030
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$38,284
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$44,314
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$661,400

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.8 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.minimal

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
CountyLarimer
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.2008
Lot (acres)The size of the land the home sits on, from county records.0.19
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Concrete
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Floor/Wall Furnace
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
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 · 84 ft²Patio · 84 ft²Porch · 84 ft²

Transaction History(1)

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
Putnam Elementary School of ScienceC
Elementary · Grades PK–5 · 0.5 mi
M
Lincoln Middle IB World SchoolC+
Middle · Grades 6–8 · 1.0 mi
H
Poudre High SchoolC
High · Grades 9–12 · 1.4 mi

District: Poudre School District R-1

Neighborhood · ZIP 80521These 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.124
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.50

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.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.28%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.37,077
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,576 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$64,880
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$84,296
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.16 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

123 N Mack 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 more than 76% of homes in Fort Collins 80521
  • Costs more per square foot than 95% of homes in Larimer County
  • Smaller than 79% of homes in Larimer County
  • Older than 96% of homes in Larimer County

What homes are worth in Fort Collins 80521

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

This home
$255K$1.4M

This home is worth more than 76% of homes in Fort Collins 80521.

How it measures up in Fort Collins 80521

The dot is this home. The mark in the middle is the typical home in Fort Collins 80521.

Estimated value$673,981
CheaperTypical $521,053Pricier

Pricier than 76% of homes nearby

Price per ft²$555
CheaperTypical $389Pricier

Pricier than 85% of homes nearby

Living area1,214 ft²
SmallerTypical 1,344 ft²Bigger

Bigger than 41% of homes nearby

Lot size0.19 ac
SmallerTypical 0.19 acBigger

Bigger than 50% of homes nearby

Year built1923
OlderTypical 1967Newer

Newer than 13% of homes nearby

How 123 N Mack St ranks against every home in each area.
MeasureThis homeOld Town WestFort Collins 80521Larimer County
Estimated valuepricier than$673,98146% of homes76% of homes70% of homes
Price per ft²pricier than$55553% of homes85% of homes95% of homes
Living areabigger than1,214 ft²50% of homes41% of homes21% of homes
Lot sizebigger than0.19 ac53% of homes50% of homes46% of homes
Year builtnewer than192348% of homes13% of homes4% of homes

About 123 N Mack St

How much is 123 N Mack St, Fort Collins, CO worth?

The TopHap Estimate for 123 N Mack St, Fort Collins, CO is $673,981 as of Sep 24, 2026. The likely range is $606,468 to $741,494. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 123 N Mack St, Fort Collins, CO?

123 N Mack St, Fort Collins, CO has 2 bedrooms, 2 bathrooms, 1,214 square feet of living space and a 0.19-acre lot.

When was 123 N Mack St, Fort Collins, CO built?

123 N Mack St, Fort Collins, CO was built in 1923, making it 103 years old. It is a ranch home. The building has 1 story.

What schools serve 123 N Mack St, Fort Collins, CO?

123 N Mack St, Fort Collins, CO is assigned to Putnam Elementary School of Science (elementary), rated C; Lincoln Middle IB World School (middle), rated C+; Poudre High School (high), rated C. All sit in Poudre School District R-1. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 123 N Mack St, Fort Collins, CO compare to other homes in Fort Collins 80521?

Among the 9,052 homes in Fort Collins 80521, it is worth more than 76% of them ($673,981 against a typical $521,053), its price per square foot is higher than 85% of them ($555 against a typical $389), it is bigger than 41% of them (1,214 ft² against a typical 1,344 ft²), its lot is bigger than 50% of them (0.19 ac against a typical 0.19 ac) and it is newer than 13% of them (1923 against a typical 1967). Measured against all of Larimer County, it is worth more than 70% 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 123 N Mack St, Fort Collins, CO?

The 2024 property tax bill for 123 N Mack St, Fort Collins, CO was $3,256. The county assessed it at $44,314.

More homes on N Mack St

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