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Duplex (2 Units, Any Combination)Residential

521 18TH ST S

GREAT FALLS, MT 59405
0
Baths
2,436 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
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.$3,788 (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.$253,200 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$232,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$253,200

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.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.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.1985
Lot (acres)The size of the land the home sits on, from county records.0.17
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
HeatingThe type of heating system in the home.Yes
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

Transaction History(2)

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 · 0.2 mi
E
Longfellow Elementary SchoolF
Elementary · Grades KG–6 · 0.6 mi
M
East Middle SchoolD+
Middle · Grades 7–8 · 1.9 mi

District: Great Falls Elementary School District

Neighborhood · ZIP 59405These 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.108
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
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.92%
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.17%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.7%
PopulationHow many people live in this area.32,971
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.88 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$55,016
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$69,667
Average tempThe average temperature here across a full year.43°F
Annual precipHow much rain and melted snow falls here in a typical year.17 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

521 18th 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 96% of homes in Great Falls 59405
  • Has a smaller lot than 80% of homes in Cascade County
  • Older than 79% of homes in Great Falls 59405

How it measures up in Great Falls 59405

The dot is this home. The mark in the middle is the typical home in Great Falls 59405.

Living area2,436 ft²
SmallerTypical 1,160 ft²Bigger

Bigger than 96% of homes nearby

Lot size0.17 ac
SmallerTypical 0.17 acBigger

Bigger than 27% of homes nearby

Year built1950
OlderTypical 1961Newer

Newer than 21% of homes nearby

How 521 18th St S ranks against every home in each area.
MeasureThis homeGreat Falls 59405Cascade County
Living areabigger than2,436 ft²96% of homes94% of homes
Lot sizebigger than0.17 ac27% of homes20% of homes
Year builtnewer than195021% of homes26% of homes

About 521 18th St S

When did 521 18th St S, Great Falls, MT last sell?

521 18th St S, Great Falls, MT last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 521 18th St S, Great Falls, MT?

521 18th St S, Great Falls, MT has 2,436 square feet of living space and a 0.17-acre lot.

When was 521 18th St S, Great Falls, MT built?

521 18th St S, Great Falls, MT was built in 1950, making it 76 years old. It is a duplex single home. The building has 1 story.

What schools serve 521 18th St S, Great Falls, MT?

521 18th St S, Great Falls, MT is assigned to Great Falls High School (high), rated D+; Longfellow Elementary School (elementary), rated F; 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 521 18th St S, Great Falls, MT compare to other homes in Great Falls 59405?

Among the 9,968 homes in Great Falls 59405, it is bigger than 96% of them (2,436 ft² against a typical 1,160 ft²), its lot is bigger than 27% of them (0.17 ac against a typical 0.17 ac) and it is newer than 21% of them (1950 against a typical 1961). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 521 18th St S, Great Falls, MT?

The 2026 property tax bill for 521 18th St S, Great Falls, MT was $3,788. The county assessed it at $253,200.

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