Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$416,417$257 / 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 90How 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 $292,000 on Aug 7, 2019

507 21ST ST SW

ALTOONA, IA 50009
3
Beds
2
Baths
1,621 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.
0.27 ac
Lot SizeThe size of the land the home sits on, from county records.
2008
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.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$416K
$374K low$459K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$292,000 · Aug 7, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,464 (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.$350,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$71,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$278,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$310,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$350,300

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.22 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.0.27
ConstructionThe main material the home's frame and walls are built from.Wood Frame
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 · 144 ft²Shed · 264 ft²Porch · 28 ft²

Transaction History(5)

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%

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

507 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 81% of homes in Polk County
  • Costs more per square foot than 84% of homes in Polk County
  • Has a bigger lot than 69% of homes in Altoona 50009
  • Newer than 83% 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
$159K$630K

This home is worth more than 80% 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$416,417
CheaperTypical $331,546Pricier

Pricier than 80% of homes nearby

Price per ft²$257
CheaperTypical $219Pricier

Pricier than 77% of homes nearby

Living area1,621 ft²
SmallerTypical 1,495 ft²Bigger

Bigger than 61% of homes nearby

Lot size0.27 ac
SmallerTypical 0.23 acBigger

Bigger than 69% of homes nearby

Year built2008
OlderTypical 2002Newer

Newer than 69% of homes nearby

How 507 21st St Sw ranks against every home in each area.
MeasureThis homeAltoona 50009Polk County
Estimated valuepricier than$416,41780% of homes81% of homes
Price per ft²pricier than$25777% of homes84% of homes
Living areabigger than1,621 ft²61% of homes63% of homes
Lot sizebigger than0.27 ac69% of homes67% of homes
Year builtnewer than200869% of homes83% of homes

About 507 21st St Sw

How much is 507 21st St Sw, Altoona, IA worth?

The TopHap Estimate for 507 21st St Sw, Altoona, IA is $416,417 as of Sep 24, 2026. The likely range is $373,679 to $459,155. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 507 21st St Sw, Altoona, IA last sell?

507 21st St Sw, Altoona, IA last sold on Aug 7, 2019 for $292,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 507 21st St Sw, Altoona, IA?

507 21st St Sw, Altoona, IA has 3 bedrooms, 2 bathrooms, 1,621 square feet of living space and a 0.27-acre lot.

When was 507 21st St Sw, Altoona, IA built?

507 21st St Sw, Altoona, IA was built in 2008, making it 18 years old. It is a ranch home. The building has 1 story.

What schools serve 507 21st St Sw, Altoona, IA?

507 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 507 21st St Sw, Altoona, IA compare to other homes in Altoona 50009?

Among the 7,615 homes in Altoona 50009, it is worth more than 80% of them ($416,417 against a typical $331,546), its price per square foot is higher than 77% of them ($257 against a typical $219), it is bigger than 61% of them (1,621 ft² against a typical 1,495 ft²), its lot is bigger than 69% of them (0.27 ac against a typical 0.23 ac) and it is newer than 69% of them (2008 against a typical 2002). Measured against all of Polk County, it is worth more than 81% 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 507 21st St Sw, Altoona, IA?

The 2024 property tax bill for 507 21st St Sw, Altoona, IA was $5,464. The county assessed it at $350,300.

More homes on 21st St Sw

Closest homes

More homes in Altoona 50009

Assigned schools

Explore the area

See this home in context

Open 507 21st 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