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Single Family ResidenceResidential
$154,056$149 / 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 93How 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 $90,000 on Feb 8, 2007

317 21ST ST SE

MASON CITY, IA 50401
3
Beds
1
Baths
1,034 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.
1917
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$154K
$143K low$165K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$90,000 · Feb 8, 2007

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,278 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$102,150 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$13,790
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$88,360
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$90,080
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$102,150

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.32
31
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
6
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
61
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
51
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
12
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.5 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.0.2 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.Conventional
CountyCERRO GORDO
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.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.Yes
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 · 280 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.

Foreclosure Filings(2)

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

E
Roosevelt Elementary SchoolC
Elementary · Grades PK–4 · 0.4 mi
M
John Adams Middle SchoolB-
Middle · Grades 7–8 · 1.9 mi
H
Mason City High SchoolC
High · Grades 9–12 · 1.9 mi

District: Mason City Community School District

Neighborhood · ZIP 50401These 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.95
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.15

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.89%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.14%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.5%
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.29,055
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.202 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$65,986
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$80,217
Average tempThe average temperature here across a full year.46°F
Annual precipHow much rain and melted snow falls here in a typical year.34 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

317 21st St Se 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.

  • Smaller than 71% of homes in Cerro Gordo County
  • Older than 82% of homes in Mason City 50401

What homes are worth in Mason City 50401

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

This home
$40K$547K

This home is worth more than 53% of homes in Mason City 50401.

How it measures up in Mason City 50401

The dot is this home. The mark in the middle is the typical home in Mason City 50401.

Estimated value$154,056
CheaperTypical $149,547Pricier

Pricier than 53% of homes nearby

Price per ft²$149
CheaperTypical $128Pricier

Pricier than 63% of homes nearby

Living area1,034 ft²
SmallerTypical 1,218 ft²Bigger

Bigger than 33% of homes nearby

Lot size0.17 ac
SmallerTypical 0.17 acBigger

Bigger than 48% of homes nearby

Year built1917
OlderTypical 1950Newer

Newer than 18% of homes nearby

How 317 21st St Se ranks against every home in each area.
MeasureThis homeMason City 50401Cerro Gordo County
Estimated valuepricier than$154,05653% of homes38% of homes
Price per ft²pricier than$14963% of homes47% of homes
Living areabigger than1,034 ft²33% of homes29% of homes
Lot sizebigger than0.17 ac48% of homes41% of homes
Year builtnewer than191718% of homes18% of homes

About 317 21st St Se

How much is 317 21st St Se, Mason City, IA worth?

The TopHap Estimate for 317 21st St Se, Mason City, IA is $154,056 as of Sep 24, 2026. The likely range is $142,885 to $165,227. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 317 21st St Se, Mason City, IA last sell?

317 21st St Se, Mason City, IA last sold on Feb 8, 2007 for $90,000, according to the county's recorded deed.

How big is 317 21st St Se, Mason City, IA?

317 21st St Se, Mason City, IA has 3 bedrooms, 1 bathrooms, 1,034 square feet of living space and a 0.17-acre lot.

When was 317 21st St Se, Mason City, IA built?

317 21st St Se, Mason City, IA was built in 1917, making it 109 years old. It is a conventional home. The building has 1 story.

What schools serve 317 21st St Se, Mason City, IA?

317 21st St Se, Mason City, IA is assigned to Roosevelt Elementary School (elementary), rated C; John Adams Middle School (middle), rated B-; Mason City High School (high), rated C. All sit in Mason City Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 317 21st St Se, Mason City, IA compare to other homes in Mason City 50401?

Among the 11,561 homes in Mason City 50401, it is worth more than 53% of them ($154,056 against a typical $149,547), its price per square foot is higher than 63% of them ($149 against a typical $128), it is bigger than 33% of them (1,034 ft² against a typical 1,218 ft²), its lot is bigger than 48% of them (0.17 ac against a typical 0.17 ac) and it is newer than 18% of them (1917 against a typical 1950). Measured against all of Cerro Gordo County, it is worth more than 38% 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 317 21st St Se, Mason City, IA?

The 2025 property tax bill for 317 21st St Se, Mason City, IA was $1,278. The county assessed it at $102,150.

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