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Duplex (2 Units, Any Combination)Residential

3 21ST ST S

GREAT FALLS, MT 59401
0
Baths
1,948 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.
0.13 ac
Lot SizeThe size of the land the home sits on, from county records.
1925
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,617 (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.$417,600 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$190,246
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$417,600

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
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.2015
Lot (acres)The size of the land the home sits on, from county records.0.13
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.Electric
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

Transaction History(3)

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.

H
Great Falls High SchoolD-
High · Grades 9–12 · 0.3 mi
E
Lincoln Elementary SchoolB+
Elementary · Grades KG–6 · 0.7 mi
M
East Middle SchoolC+
Middle · Grades 7–8 · 1.6 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

3 21st St S 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.

  • Bigger than 90% of homes in Great Falls 59401
  • Has a smaller lot than 90% of homes in Cascade County
  • Older than 86% of homes in Cascade County

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.

Living area1,948 ft²
SmallerTypical 1,138 ft²Bigger

Bigger than 90% of homes nearby

Lot size0.13 ac
SmallerTypical 0.17 acBigger

Bigger than 21% of homes nearby

Year built1925
OlderTypical 1930Newer

Newer than 44% of homes nearby

How 3 21st St S ranks against every home in each area.
MeasureThis homeGreat Falls 59401Cascade County
Living areabigger than1,948 ft²90% of homes86% of homes
Lot sizebigger than0.13 ac21% of homes10% of homes
Year builtnewer than192544% of homes14% of homes

About 3 21st St S

When did 3 21st St S, Great Falls, MT last sell?

3 21st St S, Great Falls, MT last sold on Jun 1, 2026, according to the county's recorded deed.

How big is 3 21st St S, Great Falls, MT?

3 21st St S, Great Falls, MT has 1,948 square feet of living space and a 0.13-acre lot.

When was 3 21st St S, Great Falls, MT built?

3 21st St S, Great Falls, MT was built in 1925, making it 101 years old. It is a duplex single home. The building has 1 story.

What schools serve 3 21st St S, Great Falls, MT?

3 21st St S, Great Falls, MT is assigned to Great Falls High School (high), rated D-; Lincoln Elementary School (elementary), rated B+; East Middle School (middle), rated C+. All sit in Great Falls Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3 21st St S, Great Falls, MT compare to other homes in Great Falls 59401?

Among the 4,418 homes in Great Falls 59401, it is bigger than 90% of them (1,948 ft² against a typical 1,138 ft²), its lot is bigger than 21% of them (0.13 ac against a typical 0.17 ac) and it is newer than 44% of them (1925 against a typical 1930). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 3 21st St S, Great Falls, MT?

The 2026 property tax bill for 3 21st St S, Great Falls, MT was $3,617. The county assessed it at $417,600.

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