Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$360,965$266 / 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 77How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $68,800 on Oct 28, 2016

121 20TH ST SW

GREAT FALLS, MT 59404
3
Beds
2
Baths
1,356 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.
0.49 ac
Lot SizeThe size of the land the home sits on, from county records.
1940
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$361K
$278K low$444K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$68,800 · Oct 28, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,576 (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.$272,130 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$233,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$272,130

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.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
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.1990
Lot (acres)The size of the land the home sits on, from county records.0.49
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
FireplaceWhether the home has a fireplace, and what kind.Yes
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 · 168 ft²

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.

E
West Elementary SchoolC-
Elementary · Grades KG–6 · 0.7 mi
H
C M Russell High SchoolB-
High · Grades 9–12 · 1.6 mi
M
North Middle SchoolB-
Middle · Grades 7–8 · 3.0 mi

District: Great Falls High School District

Neighborhood · ZIP 59404These 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.59
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.53

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.3%
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.28,661
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.101 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$81,568
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$97,297
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%

Owner Tools

Do you own this home?
Claim this home

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

121 20th St Sw 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.

  • Has a bigger lot than 75% of homes in Cascade County
  • Older than 92% of homes in Great Falls 59404

What homes are worth in Great Falls 59404

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

This home
$169K$1M

This home is worth more than 42% of homes in Great Falls 59404.

How it measures up in Great Falls 59404

The dot is this home. The mark in the middle is the typical home in Great Falls 59404.

Estimated value$360,965
CheaperTypical $390,859Pricier

Pricier than 42% of homes nearby

Price per ft²$266
CheaperTypical $290Pricier

Pricier than 38% of homes nearby

Living area1,356 ft²
SmallerTypical 1,337 ft²Bigger

Bigger than 52% of homes nearby

Lot size0.49 ac
SmallerTypical 0.24 acBigger

Bigger than 73% of homes nearby

Year built1940
OlderTypical 1976Newer

Newer than 8% of homes nearby

How 121 20th St Sw ranks against every home in each area.
MeasureThis homeGreat Falls 59404Cascade County
Estimated valuepricier than$360,96542% of homes56% of homes
Price per ft²pricier than$26638% of homes41% of homes
Living areabigger than1,356 ft²52% of homes59% of homes
Lot sizebigger than0.49 ac73% of homes75% of homes
Year builtnewer than19408% of homes19% of homes

About 121 20th St Sw

How much is 121 20th St Sw, Great Falls, MT worth?

The TopHap Estimate for 121 20th St Sw, Great Falls, MT is $360,965 as of Aug 30, 2026. The likely range is $277,978 to $443,952. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 121 20th St Sw, Great Falls, MT last sell?

121 20th St Sw, Great Falls, MT last sold on Oct 28, 2016 for $68,800, according to the county's recorded deed.

How big is 121 20th St Sw, Great Falls, MT?

121 20th St Sw, Great Falls, MT has 3 bedrooms, 2 bathrooms, 1,356 square feet of living space and a 0.49-acre lot.

When was 121 20th St Sw, Great Falls, MT built?

121 20th St Sw, Great Falls, MT was built in 1940, making it 86 years old. It is a ranch home. The building has 1 story.

What schools serve 121 20th St Sw, Great Falls, MT?

121 20th St Sw, Great Falls, MT is assigned to West Elementary School (elementary), rated C-; C M Russell High School (high), rated B-; North Middle School (middle), rated B-. All sit in Great Falls High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 121 20th St Sw, Great Falls, MT compare to other homes in Great Falls 59404?

Among the 11,757 homes in Great Falls 59404, it is worth more than 42% of them ($360,965 against a typical $390,859), its price per square foot is higher than 38% of them ($266 against a typical $290), it is bigger than 52% of them (1,356 ft² against a typical 1,337 ft²), its lot is bigger than 73% of them (0.49 ac against a typical 0.24 ac) and it is newer than 8% of them (1940 against a typical 1976). Measured against all of Cascade County, it is worth more than 56% 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 121 20th St Sw, Great Falls, MT?

The 2026 property tax bill for 121 20th St Sw, Great Falls, MT was $1,576. The county assessed it at $272,130.

More homes on 20th St Sw

Closest homes

More homes in Great Falls 59404

Assigned schools

Explore the area

See this home in context

Open 121 20th St Sw on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map