Skip to content
Skip to content
TopHapOpen in map
Residential (General/Single)Residential
$997,648$99 / 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 84How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $550,000 on Aug 1, 2005

520 15TH ST

ONAWA, IA 51040
3
Beds
3 / 3
Baths
10,085 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.
8.55 ac
Lot SizeThe size of the land the home sits on, from county records.
2001
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
8
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$998K
$834K low$1.2M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$550,000 · Aug 1, 2005

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$16,350 (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.$1,202,200 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$52,650
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,149,550
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$991,619
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,202,200

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.12 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)
StyleThe architectural style of the home, such as ranch or colonial.Conventional
CountyMONONA
Lot (acres)The size of the land the home sits on, from county records.8.55
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
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 · 696 ft²Shed · 1,500 ft²Patio · 240 ft²Porch · 30 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.

H
West Monona High SchoolB
High · Grades 9–12 · 0.7 mi
M
West Monona Middle SchoolB
Middle · Grades 6–8 · 0.7 mi
E
West Monona Elementary SchoolB-
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%

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

520 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.

  • Among the most valuable homes in Onawa 51040
  • Among the largest homes in Onawa 51040
  • Has a bigger lot than 95% of homes in Onawa 51040
  • Newer than 91% 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
$23K$411K

This home is worth more than almost all 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$997,648
CheaperTypical $104,406Pricier

Pricier than almost all homes nearby

Price per ft²$99
CheaperTypical $87Pricier

Pricier than 57% of homes nearby

Living area10,085 ft²
SmallerTypical 1,296 ft²Bigger

Bigger than almost all homes nearby

Lot size8.55 ac
SmallerTypical 0.19 acBigger

Bigger than 95% of homes nearby

Year built2001
OlderTypical 1951Newer

Newer than 91% of homes nearby

How 520 15th St ranks against every home in each area.
MeasureThis homeOnawa 51040Monona County
Estimated valuepricier than$997,648almost all homesalmost all homes
Price per ft²pricier than$9957% of homes58% of homes
Living areabigger than10,085 ft²almost all homesalmost all homes
Lot sizebigger than8.55 ac95% of homes86% of homes
Year builtnewer than200191% of homes88% of homes

About 520 15th St

How much is 520 15th St, Onawa, IA worth?

The TopHap Estimate for 520 15th St, Onawa, IA is $997,648 as of Aug 30, 2026. The likely range is $833,656 to $1,161,640. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 520 15th St, Onawa, IA last sell?

520 15th St, Onawa, IA last sold on Aug 1, 2005 for $550,000, according to the county's recorded deed.

How big is 520 15th St, Onawa, IA?

520 15th St, Onawa, IA has 3 bedrooms, 3 bathrooms, 10,085 square feet of living space and a 8.55-acre lot.

When was 520 15th St, Onawa, IA built?

520 15th St, Onawa, IA was built in 2001, making it 25 years old. It is a conventional home. The building has 2 stories.

What schools serve 520 15th St, Onawa, IA?

520 15th St, Onawa, IA is assigned to West Monona High School (high), rated B; West Monona Middle School (middle), rated B; West Monona Elementary School (elementary), rated B-. All sit in West Monona Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 520 15th St, Onawa, IA compare to other homes in Onawa 51040?

Among the 1,938 homes in Onawa 51040, it is worth more than almost all of them ($997,648 against a typical $104,406), its price per square foot is higher than 57% of them ($99 against a typical $87), it is bigger than almost all of them (10,085 ft² against a typical 1,296 ft²), its lot is bigger than 95% of them (8.55 ac against a typical 0.19 ac) and it is newer than 91% of them (2001 against a typical 1951). Measured against all of Monona County, it is worth more than almost all 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 520 15th St, Onawa, IA?

The 2025 property tax bill for 520 15th St, Onawa, IA was $16,350. The county assessed it at $1,202,200.

More homes on 15th St

Closest homes

More homes in Onawa 51040

Assigned schools

Explore the area

See this home in context

Open 520 15th St 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