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Residential (General/Single)Residential
$406,643$159 / 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 80How 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 $280,000 on Jul 21, 2025

320 15TH ST

ONAWA, IA 51040
4
Beds
2 / 2
Baths
2,565 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.
1.31 ac
Lot SizeThe size of the land the home sits on, from county records.
1973
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
8
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

$407K
$326K low$487K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$280,000 · Jul 21, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,260 (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.$338,234 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$30,930
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$307,304
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$308,165
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$338,234

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%

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.1.31
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.Forced Air With Air Conditioning
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.Mixed
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 · 48 ft²Patio · 300 ft²Porch · 60 ft²

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

H
West Monona High SchoolB-
High · Grades 9–12 · 0.8 mi
M
West Monona Middle SchoolC+
Middle · Grades 6–8 · 0.8 mi
E
West Monona Elementary SchoolC
Elementary · Grades PK–5 · 0.9 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%

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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

320 15th 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 more than 97% of homes in Monona County
  • Costs more per square foot than 81% of homes in Monona County
  • Bigger than 95% of homes in Onawa 51040
  • Has a bigger lot than 86% of homes in Onawa 51040
  • Newer than 68% 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
$25K$442K

This home is worth more than 96% 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$406,643
CheaperTypical $110,576Pricier

Pricier than 96% of homes nearby

Price per ft²$159
CheaperTypical $91Pricier

Pricier than 80% of homes nearby

Living area2,565 ft²
SmallerTypical 1,296 ft²Bigger

Bigger than 95% of homes nearby

Lot size1.31 ac
SmallerTypical 0.19 acBigger

Bigger than 86% of homes nearby

Year built1973
OlderTypical 1952Newer

Newer than 68% of homes nearby

How 320 15th St ranks against every home in each area.
MeasureThis homeOnawa 51040Monona County
Estimated valuepricier than$406,64396% of homes97% of homes
Price per ft²pricier than$15980% of homes81% of homes
Living areabigger than2,565 ft²95% of homes94% of homes
Lot sizebigger than1.31 ac86% of homes72% of homes
Year builtnewer than197368% of homes68% of homes

About 320 15th St

How much is 320 15th St, Onawa, IA worth?

The TopHap Estimate for 320 15th St, Onawa, IA is $406,643 as of Sep 24, 2026. The likely range is $326,107 to $487,179. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 320 15th St, Onawa, IA last sell?

320 15th St, Onawa, IA last sold on Jul 21, 2025 for $280,000, according to the county's recorded deed.

How big is 320 15th St, Onawa, IA?

320 15th St, Onawa, IA has 4 bedrooms, 2 bathrooms, 2,565 square feet of living space and a 1.31-acre lot.

When was 320 15th St, Onawa, IA built?

320 15th St, Onawa, IA was built in 1973, making it 53 years old. The building has 1 story.

What schools serve 320 15th St, Onawa, IA?

320 15th St, Onawa, IA is assigned to West Monona High School (high), rated B-; West Monona Middle School (middle), rated C+; West Monona Elementary School (elementary), rated C. All sit in West Monona Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 320 15th St, Onawa, IA compare to other homes in Onawa 51040?

Among the 1,938 homes in Onawa 51040, it is worth more than 96% of them ($406,643 against a typical $110,576), its price per square foot is higher than 80% of them ($159 against a typical $91), it is bigger than 95% of them (2,565 ft² against a typical 1,296 ft²), its lot is bigger than 86% of them (1.31 ac against a typical 0.19 ac) and it is newer than 68% of them (1973 against a typical 1952). Measured against all of Monona County, it is worth more than 97% 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 320 15th St, Onawa, IA?

The 2026 property tax bill for 320 15th St, Onawa, IA was $4,260. The county assessed it at $338,234.

More homes on 15th St

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Assigned schools

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