Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$470,846$334 / 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 93How 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 $440,000 on Jun 18, 2025

328 18TH AVE SE

ROCK VALLEY, IA 51247
1
Baths
1,408 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.
0.37 ac
Lot SizeThe size of the land the home sits on, from county records.
2024
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
4
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$471K
$436K low$506K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$440,000 · Jun 18, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,314 (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.$210,770 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$43,780
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$166,990
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$640
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$210,770

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.34
50
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
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.13 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.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.0.37
HeatingThe type of heating system in the home.Yes
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 · 333 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 · 1.3 mi
M
Rock Valley High SchoolA-
Middle · Grades 9–12 · 1.3 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%

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

328 18th Ave Se 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 87% of homes in Sioux County
  • Costs more per square foot than 96% of homes in Rock Valley 51247
  • Among the newest 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
$86K$651K

This home is worth more than 86% 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$470,846
CheaperTypical $286,234Pricier

Pricier than 86% of homes nearby

Price per ft²$334
CheaperTypical $195Pricier

Pricier than 96% of homes nearby

Living area1,408 ft²
SmallerTypical 1,502 ft²Bigger

Bigger than 40% of homes nearby

Lot size0.37 ac
SmallerTypical 0.36 acBigger

Bigger than 52% of homes nearby

Year built2024
OlderTypical 1974Newer

Newer than almost all homes nearby

How 328 18th Ave Se ranks against every home in each area.
MeasureThis homeRock Valley 51247Sioux County
Estimated valuepricier than$470,84686% of homes87% of homes
Price per ft²pricier than$33496% of homes95% of homes
Living areabigger than1,408 ft²40% of homes41% of homes
Lot sizebigger than0.37 ac52% of homes56% of homes
Year builtnewer than2024almost all homesalmost all homes

About 328 18th Ave Se

How much is 328 18th Ave Se, Rock Valley, IA worth?

The TopHap Estimate for 328 18th Ave Se, Rock Valley, IA is $470,846 as of Aug 30, 2026. The likely range is $435,635 to $506,057. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 328 18th Ave Se, Rock Valley, IA last sell?

328 18th Ave Se, Rock Valley, IA last sold on Jun 18, 2025 for $440,000, according to the county's recorded deed.

How big is 328 18th Ave Se, Rock Valley, IA?

328 18th Ave Se, Rock Valley, IA has 1 bathrooms, 1,408 square feet of living space and a 0.37-acre lot.

When was 328 18th Ave Se, Rock Valley, IA built?

328 18th Ave Se, Rock Valley, IA was built in 2024, making it 2 years old. The building has 1 story.

What schools serve 328 18th Ave Se, Rock Valley, IA?

328 18th Ave Se, 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 328 18th Ave Se, 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 86% of them ($470,846 against a typical $286,234), its price per square foot is higher than 96% of them ($334 against a typical $195), it is bigger than 40% of them (1,408 ft² against a typical 1,502 ft²), its lot is bigger than 52% of them (0.37 ac against a typical 0.36 ac) and it is newer than almost all of them (2024 against a typical 1974). Measured against all of Sioux County, it is worth more than 87% 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 328 18th Ave Se, Rock Valley, IA?

The 2025 property tax bill for 328 18th Ave Se, Rock Valley, IA was $3,314. The county assessed it at $210,770.

More homes on 18th Ave Se

Closest homes

More homes in Rock Valley 51247

Assigned schools

Explore the area

See this home in context

Open 328 18th Ave Se 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