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Single Family ResidenceResidential
$299,397$384 / 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 96How 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 $199,900 on May 8, 2020

517 21ST ST N

GREAT FALLS, MT 59401
4
Beds
1
Baths
780 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.
3,746 ft²
Lot SizeThe size of the land the home sits on, from county records.
1930
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
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

$299K
$287K low$312K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$199,900 · May 8, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,645 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$243,700 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$195,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$243,700

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.Historical
CountyCASCADE
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.2005
Lot (acres)The size of the land the home sits on, from county records.0.09
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, 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.Porch · 136 ft²

Transaction History(8)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Foreclosure Filings(4)

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

H
Great Falls High SchoolD+
High · Grades 9–12 · 0.7 mi
E
Giant Springs Elementary SchoolC+
Elementary · Grades KG–6 · 0.8 mi
M
East Middle SchoolD+
Middle · Grades 7–8 · 1.7 mi

District: Great Falls Elementary School District

Neighborhood · ZIP 59401These 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.122
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.46

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.90%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.15%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.23%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.13,474
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,643 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$54,638
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$67,270
Average tempThe average temperature here across a full year.45°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.61%

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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

517 21st St N 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 69% of homes in Cascade County
  • Costs more per square foot than 97% of homes in Great Falls 59401
  • Smaller than 93% of homes in Cascade County
  • Has a smaller lot than 94% of homes in Cascade County
  • Older than 84% of homes in Cascade County

What homes are worth in Great Falls 59401

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

This home
$171K$547K

This home is worth more than 50% of homes in Great Falls 59401.

How it measures up in Great Falls 59401

The dot is this home. The mark in the middle is the typical home in Great Falls 59401.

Estimated value$299,397
CheaperTypical $299,418Pricier

Pricier than 50% of homes nearby

Price per ft²$384
CheaperTypical $258Pricier

Pricier than 97% of homes nearby

Living area780 ft²
SmallerTypical 1,142 ft²Bigger

Bigger than 10% of homes nearby

Lot size3,746 ft²
SmallerTypical 0.17 acBigger

Bigger than 10% of homes nearby

Year built1930
OlderTypical 1930Newer

Newer than 51% of homes nearby

How 517 21st St N ranks against every home in each area.
MeasureThis homeGreat Falls 59401Cascade County
Estimated valuepricier than$299,39750% of homes31% of homes
Price per ft²pricier than$38497% of homes87% of homes
Living areabigger than780 ft²10% of homes7% of homes
Lot sizebigger than3,746 ft²10% of homes6% of homes
Year builtnewer than193051% of homes16% of homes

About 517 21st St N

How much is 517 21st St N, Great Falls, MT worth?

The TopHap Estimate for 517 21st St N, Great Falls, MT is $299,397 as of Sep 24, 2026. The likely range is $286,509 to $312,285. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 517 21st St N, Great Falls, MT last sell?

517 21st St N, Great Falls, MT last sold on May 8, 2020 for $199,900, according to the county's recorded deed.

How big is 517 21st St N, Great Falls, MT?

517 21st St N, Great Falls, MT has 4 bedrooms, 1 bathrooms, 780 square feet of living space and a 0.09-acre lot.

When was 517 21st St N, Great Falls, MT built?

517 21st St N, Great Falls, MT was built in 1930, making it 96 years old. It is a historical home. The building has 1 story.

What schools serve 517 21st St N, Great Falls, MT?

517 21st St N, Great Falls, MT is assigned to Great Falls High School (high), rated D+; Giant Springs Elementary School (elementary), rated C+; East Middle School (middle), rated D+. All sit in Great Falls Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 517 21st St N, Great Falls, MT compare to other homes in Great Falls 59401?

Among the 4,418 homes in Great Falls 59401, it is worth more than 50% of them ($299,397 against a typical $299,418), its price per square foot is higher than 97% of them ($384 against a typical $258), it is bigger than 10% of them (780 ft² against a typical 1,142 ft²), its lot is bigger than 10% of them (3,746 ft² against a typical 0.17 ac) and it is newer than 51% of them (1930 against a typical 1930). Measured against all of Cascade 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 517 21st St N, Great Falls, MT?

The 2026 property tax bill for 517 21st St N, Great Falls, MT was $3,645. The county assessed it at $243,700.

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