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Residential (General/Single)Residential
$67,647$46 / 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 74How 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

503 12TH ST

ONAWA, IA 51040
4
Beds
1 / 1
Baths
1,456 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.
0.19 ac
Lot SizeThe size of the land the home sits on, from county records.
1920
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
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

$68K
$50K low$85K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,336 (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.$106,016 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$8,666
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$97,350
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$96,577
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$106,016

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.7 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Residential (General/Single)
CountyMONONA
Lot (acres)The size of the land the home sits on, from county records.0.19
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Block (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Baseboard
CoolingThe type of cooling or air conditioning in the home.None
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.Patio · 196 ft²Porch · 102 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.

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

E
West Monona Elementary SchoolC
Elementary · Grades PK–5 · 0.6 mi
H
West Monona High SchoolB-
High · Grades 9–12 · 0.8 mi
M
West Monona Middle SchoolC+
Middle · Grades 6–8 · 0.8 mi

District: West Monona Community School District

Neighborhood · ZIP 51040These 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.100
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.90
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.16

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.90%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.10%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.13%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.3,959
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.29 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$57,746
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$72,985
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.30 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.61%

Owner Tools

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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

503 12th St 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 less than 71% of homes in Onawa 51040
  • Costs less per square foot than 89% of homes in Onawa 51040
  • Has a smaller lot than 88% of homes in Onawa 51040

What homes are worth in Onawa 51040

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

This home
$24K$432K

This home is worth more than 29% of homes in Onawa 51040.

How it measures up in Onawa 51040

The dot is this home. The mark in the middle is the typical home in Onawa 51040.

Estimated value$67,647
CheaperTypical $109,946Pricier

Pricier than 29% of homes nearby

Price per ft²$46
CheaperTypical $91Pricier

Pricier than 11% of homes nearby

Living area1,456 ft²
SmallerTypical 1,296 ft²Bigger

Bigger than 62% of homes nearby

Lot size0.19 ac
SmallerTypical 0.19 acBigger

Bigger than 12% of homes nearby

Year built1920
OlderTypical 1952Newer

Newer than 41% of homes nearby

How 503 12th St ranks against every home in each area.
MeasureThis homeOnawa 51040Monona County
Estimated valuepricier than$67,64729% of homes31% of homes
Price per ft²pricier than$4611% of homes14% of homes
Living areabigger than1,456 ft²62% of homes57% of homes
Lot sizebigger than0.19 ac12% of homes13% of homes
Year builtnewer than192041% of homes46% of homes

About 503 12th St

How much is 503 12th St, Onawa, IA worth?

The TopHap Estimate for 503 12th St, Onawa, IA is $67,647 as of Sep 24, 2026. The likely range is $49,848 to $85,446. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 503 12th St, Onawa, IA last sell?

503 12th St, Onawa, IA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 503 12th St, Onawa, IA?

503 12th St, Onawa, IA has 4 bedrooms, 1 bathrooms, 1,456 square feet of living space and a 0.19-acre lot.

When was 503 12th St, Onawa, IA built?

503 12th St, Onawa, IA was built in 1920, making it 106 years old. The building has 2 stories.

What schools serve 503 12th St, Onawa, IA?

503 12th St, Onawa, IA is assigned to West Monona Elementary School (elementary), rated C; West Monona High School (high), rated B-; West Monona Middle School (middle), rated C+. All sit in West Monona Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 503 12th St, Onawa, IA compare to other homes in Onawa 51040?

Among the 1,938 homes in Onawa 51040, it is worth more than 29% of them ($67,647 against a typical $109,946), its price per square foot is higher than 11% of them ($46 against a typical $91), it is bigger than 62% of them (1,456 ft² against a typical 1,296 ft²), its lot is bigger than 12% of them (0.19 ac against a typical 0.19 ac) and it is newer than 41% of them (1920 against a typical 1952). Measured against all of Monona County, it is worth more than 31% 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 503 12th St, Onawa, IA?

The 2026 property tax bill for 503 12th St, Onawa, IA was $1,336. The county assessed it at $106,016.

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