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Rural ResidenceResidential
$328,432$140 / 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 Jul 14, 2026

21259 UNION AVE

SHELL ROCK, IA 50670
4
Beds
2
Baths
2,345 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.
28.07 ac
Lot SizeThe size of the land the home sits on, from county records.
1900
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.

Valuation

$328K
$277K low$380K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,732 (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.$144,340 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$45,430
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$98,910
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$127,590
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$144,340

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.44
59
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
20
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
69
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
60
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
12
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.1 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Rural Residence
CountyBUTLER
Lot (acres)The size of the land the home sits on, from county records.28.07
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.Metal
HeatingThe type of heating system in the home.None
CoolingThe type of cooling or air conditioning in the home.None
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 · 448 ft²Shed · 216 ft²Patio · 944 ft²Porch · 108 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
Shell Rock Elementary SchoolA
Elementary · Grades PK–4 · 3.5 mi
M
Waverly-Shell Rock Middle SchoolB+
Middle · Grades 5–8 · 7.4 mi
H
Waverly-Shell Rock Senior High SchoolA+
High · Grades 9–12 · 7.7 mi

District: Waverly-Shell Rock Community School District

Neighborhood · ZIP 50670These 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.107
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.11

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.17%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.12%
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.1,981
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.35 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$80,862
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$91,558
Average tempThe average temperature here across a full year.47°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.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

21259 Union Ave 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 Butler County
  • Costs less per square foot than 73% of homes in Shell Rock 50670
  • Bigger than 93% of homes in Shell Rock 50670
  • Has a bigger lot than 93% of homes in Shell Rock 50670
  • Older than 78% of homes in Shell Rock 50670

What homes are worth in Shell Rock 50670

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

This home
$67K$615K

This home is worth more than 69% of homes in Shell Rock 50670.

How it measures up in Shell Rock 50670

The dot is this home. The mark in the middle is the typical home in Shell Rock 50670.

Estimated value$328,432
CheaperTypical $250,271Pricier

Pricier than 69% of homes nearby

Price per ft²$140
CheaperTypical $182Pricier

Pricier than 27% of homes nearby

Living area2,345 ft²
SmallerTypical 1,428 ft²Bigger

Bigger than 93% of homes nearby

Lot size28.07 ac
SmallerTypical 0.46 acBigger

Bigger than 93% of homes nearby

Year built1900
OlderTypical 1967Newer

Newer than 22% of homes nearby

How 21259 Union Ave ranks against every home in each area.
MeasureThis homeShell Rock 50670Butler County
Estimated valuepricier than$328,43269% of homes86% of homes
Price per ft²pricier than$14027% of homes62% of homes
Living areabigger than2,345 ft²93% of homes93% of homes
Lot sizebigger than28.07 ac93% of homes92% of homes
Year builtnewer than190022% of homes23% of homes

About 21259 Union Ave

How much is 21259 Union Ave, Shell Rock, IA worth?

The TopHap Estimate for 21259 Union Ave, Shell Rock, IA is $328,432 as of Jul 14, 2026. The likely range is $276,856 to $380,008. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21259 Union Ave, Shell Rock, IA last sell?

21259 Union Ave, Shell Rock, IA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21259 Union Ave, Shell Rock, IA?

21259 Union Ave, Shell Rock, IA has 4 bedrooms, 2 bathrooms, 2,345 square feet of living space and a 28.07-acre lot.

When was 21259 Union Ave, Shell Rock, IA built?

21259 Union Ave, Shell Rock, IA was built in 1900, making it 126 years old. The building has 1 story.

What schools serve 21259 Union Ave, Shell Rock, IA?

21259 Union Ave, Shell Rock, IA is assigned to Shell Rock Elementary School (elementary), rated A; Waverly-Shell Rock Middle School (middle), rated B+; Waverly-Shell Rock Senior High School (high), rated A+. All sit in Waverly-Shell Rock Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21259 Union Ave, Shell Rock, IA compare to other homes in Shell Rock 50670?

Among the 878 homes in Shell Rock 50670, it is worth more than 69% of them ($328,432 against a typical $250,271), its price per square foot is higher than 27% of them ($140 against a typical $182), it is bigger than 93% of them (2,345 ft² against a typical 1,428 ft²), its lot is bigger than 93% of them (28.07 ac against a typical 0.46 ac) and it is newer than 22% of them (1900 against a typical 1967). Measured against all of Butler County, it is worth more than 86% 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 21259 Union Ave, Shell Rock, IA?

The 2025 property tax bill for 21259 Union Ave, Shell Rock, IA was $1,732. The county assessed it at $144,340.

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