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Single Family ResidenceResidential
$306,461$146 / 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 85How 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
Last sold for $384,500 on Jan 12, 2022

1500 21ST AVE

ROCK VALLEY, IA 51247
3.5
Baths
2,100 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.
0.6 ac
Lot SizeThe size of the land the home sits on, from county records.
1956
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$306K
$262K low$351K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$384,500 · Jan 12, 2022
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$306,461
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$245,169

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,290 (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.$332,290 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$36,090
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$296,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$291,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$332,290

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.33
11
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
33
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
63
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
44
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
15
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.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%
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
CountySIOUX
Lot (acres)The size of the land the home sits on, from county records.0.60
ConstructionThe main material the home's frame and walls are built from.Brick
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
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.Porch · 384 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
Rock Valley Elementary SchoolA
Elementary · Grades PK–5 · 0.3 mi
M
Rock Valley High SchoolA-
Middle · Grades 9–12 · 0.3 mi

District: Rock Valley Community School District

Neighborhood · ZIP 51247These 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.127
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.94
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.18

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.14%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.7%
PopulationHow many people live in this area.5,240
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.47 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$83,197
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$99,994
Average tempThe average temperature here across a full year.47°F
Annual precipHow much rain and melted snow falls here in a typical year.27 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.61%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

1500 21st 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.

  • Costs less per square foot than 73% of homes in Rock Valley 51247
  • Bigger than 85% of homes in Sioux County
  • Has a bigger lot than 68% of homes in Sioux County
  • Older than 65% of homes in Rock Valley 51247

What homes are worth in Rock Valley 51247

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

This home
$97K$653K

This home is worth more than 56% of homes in Rock Valley 51247.

How it measures up in Rock Valley 51247

The dot is this home. The mark in the middle is the typical home in Rock Valley 51247.

Estimated value$306,461
CheaperTypical $282,845Pricier

Pricier than 56% of homes nearby

Price per ft²$146
CheaperTypical $192Pricier

Pricier than 27% of homes nearby

Living area2,100 ft²
SmallerTypical 1,501 ft²Bigger

Bigger than 84% of homes nearby

Lot size0.6 ac
SmallerTypical 0.36 acBigger

Bigger than 66% of homes nearby

Year built1956
OlderTypical 1975Newer

Newer than 35% of homes nearby

How 1500 21st Ave ranks against every home in each area.
MeasureThis homeRock Valley 51247Sioux County
Estimated valuepricier than$306,46156% of homes58% of homes
Price per ft²pricier than$14627% of homes32% of homes
Living areabigger than2,100 ft²84% of homes85% of homes
Lot sizebigger than0.6 ac66% of homes68% of homes
Year builtnewer than195635% of homes40% of homes

About 1500 21st Ave

How much is 1500 21st Ave, Rock Valley, IA worth?

The TopHap Estimate for 1500 21st Ave, Rock Valley, IA is $306,461 as of Jul 14, 2026. The likely range is $261,744 to $351,178. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1500 21st Ave, Rock Valley, IA last sell?

1500 21st Ave, Rock Valley, IA last sold on Jan 12, 2022 for $384,500, according to the county's recorded deed.

How big is 1500 21st Ave, Rock Valley, IA?

1500 21st Ave, Rock Valley, IA has 3.5 bathrooms, 2,100 square feet of living space and a 0.60-acre lot.

When was 1500 21st Ave, Rock Valley, IA built?

1500 21st Ave, Rock Valley, IA was built in 1956, making it 70 years old. The building has 1 story.

What schools serve 1500 21st Ave, Rock Valley, IA?

1500 21st Ave, Rock Valley, IA is assigned to Rock Valley Elementary School (elementary), rated A; Rock Valley High School (middle), rated A-. All sit in Rock Valley Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1500 21st Ave, Rock Valley, IA compare to other homes in Rock Valley 51247?

Among the 1,825 homes in Rock Valley 51247, it is worth more than 56% of them ($306,461 against a typical $282,845), its price per square foot is higher than 27% of them ($146 against a typical $192), it is bigger than 84% of them (2,100 ft² against a typical 1,501 ft²), its lot is bigger than 66% of them (0.6 ac against a typical 0.36 ac) and it is newer than 35% of them (1956 against a typical 1975). Measured against all of Sioux County, it is worth more than 58% 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 1500 21st Ave, Rock Valley, IA?

The 2025 property tax bill for 1500 21st Ave, Rock Valley, IA was $4,290. The county assessed it at $332,290.

Closest homes

More homes in Rock Valley 51247

Assigned schools

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