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Single Family ResidenceResidential
$447,796$284 / 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 88How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $231,500 on Apr 29, 2010

523 21ST ST SW

ALTOONA, IA 50009
3
Beds
2
Baths
1,574 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.
0.38 ac
Lot SizeThe size of the land the home sits on, from county records.
2009
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.
4
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$448K
$395K low$501K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$231,500 · Apr 29, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,208 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$361,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$77,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$283,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$319,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$361,300

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.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.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.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Ranch
CountyPolk
Lot (acres)The size of the land the home sits on, from county records.0.38
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Concrete
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 128 ft²Porch · 174 ft²

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.

E
Clay ElementaryC+
Elementary · Grades PK–5 · 0.7 mi
H
Southeast Polk High SchoolC-
High · Grades 9–12 · 2.7 mi
M
Southeast Polk Junior HighC
Middle · Grades 7–8 · 2.8 mi

District: Southeast Polk Community School District

Neighborhood · ZIP 50009These 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.57
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.12

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.25%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.21,191
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.798 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,697
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$106,400
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.35 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.59%

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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

523 21st 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.

  • Worth more than 86% of homes in Altoona 50009
  • Costs more per square foot than 92% of homes in Altoona 50009
  • Has a bigger lot than 84% of homes in Altoona 50009
  • Newer than 84% of homes in Polk County

What homes are worth in Altoona 50009

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

This home
$155K$629K

This home is worth more than 86% of homes in Altoona 50009.

How it measures up in Altoona 50009

The dot is this home. The mark in the middle is the typical home in Altoona 50009.

Estimated value$447,796
CheaperTypical $330,932Pricier

Pricier than 86% of homes nearby

Price per ft²$284
CheaperTypical $216Pricier

Pricier than 92% of homes nearby

Living area1,574 ft²
SmallerTypical 1,496 ft²Bigger

Bigger than 57% of homes nearby

Lot size0.38 ac
SmallerTypical 0.23 acBigger

Bigger than 84% of homes nearby

Year built2009
OlderTypical 2002Newer

Newer than 70% of homes nearby

How 523 21st St Sw ranks against every home in each area.
MeasureThis homeAltoona 50009Polk County
Estimated valuepricier than$447,79686% of homes85% of homes
Price per ft²pricier than$28492% of homes92% of homes
Living areabigger than1,574 ft²57% of homes59% of homes
Lot sizebigger than0.38 ac84% of homes82% of homes
Year builtnewer than200970% of homes84% of homes

About 523 21st St Sw

How much is 523 21st St Sw, Altoona, IA worth?

The TopHap Estimate for 523 21st St Sw, Altoona, IA is $447,796 as of Oct 21, 2026. The likely range is $394,515 to $501,077. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 523 21st St Sw, Altoona, IA last sell?

523 21st St Sw, Altoona, IA last sold on Apr 29, 2010 for $231,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 523 21st St Sw, Altoona, IA?

523 21st St Sw, Altoona, IA has 3 bedrooms, 2 bathrooms, 1,574 square feet of living space and a 0.38-acre lot.

When was 523 21st St Sw, Altoona, IA built?

523 21st St Sw, Altoona, IA was built in 2009, making it 17 years old. It is a ranch home. The building has 1 story.

What schools serve 523 21st St Sw, Altoona, IA?

523 21st St Sw, Altoona, IA is assigned to Clay Elementary (elementary), rated C+; Southeast Polk High School (high), rated C-; Southeast Polk Junior High (middle), rated C. All sit in Southeast Polk Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 523 21st St Sw, Altoona, IA compare to other homes in Altoona 50009?

Among the 7,707 homes in Altoona 50009, it is worth more than 86% of them ($447,796 against a typical $330,932), its price per square foot is higher than 92% of them ($284 against a typical $216), it is bigger than 57% of them (1,574 ft² against a typical 1,496 ft²), its lot is bigger than 84% of them (0.38 ac against a typical 0.23 ac) and it is newer than 70% of them (2009 against a typical 2002). Measured against all of Polk County, it is worth more than 85% 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 523 21st St Sw, Altoona, IA?

The 2024 property tax bill for 523 21st St Sw, Altoona, IA was $5,208. The county assessed it at $361,300.

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