Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$393,915$223 / 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 83How 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 $1,500 on Jun 8, 2010

511 12TH ST

ALTON, IA 51003
1
Baths
1,770 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1949
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$394K
$328K low$460K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,500 · Jun 8, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,580 (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.$263,890 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$22,560
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$241,330
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$212,150
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$263,890

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.0.23
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.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.Deck · 192 ft²Patio · 80 ft²

Transaction History(3)

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.

M
Moc-Floyd Valley Middle SchoolB
Middle · Grades 6–8 · 0.1 mi
E
Moc-Floyd Valley Elementary SchoolB+
Elementary · Grades PK–5 · 1.1 mi
H
Moc-Floyd Valley High SchoolA-
High · Grades 9–12 · 2.0 mi

District: Moc-Floyd Valley Community School District

Neighborhood · ZIP 51003These 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.117
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 100.18

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.94%
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.4.2%
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.2,164
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.39 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,017
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$109,952
Average tempThe average temperature here across a full year.46°F
Annual precipHow much rain and melted snow falls here in a typical year.28 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

511 12th 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 79% of homes in Alton 51003
  • Costs more per square foot than 74% of homes in Alton 51003
  • Bigger than 70% of homes in Sioux County
  • Has a smaller lot than 77% of homes in Alton 51003
  • Older than 65% of homes in Sioux County

What homes are worth in Alton 51003

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

This home
$90K$633K

This home is worth more than 79% of homes in Alton 51003.

How it measures up in Alton 51003

The dot is this home. The mark in the middle is the typical home in Alton 51003.

Estimated value$393,915
CheaperTypical $260,554Pricier

Pricier than 79% of homes nearby

Price per ft²$223
CheaperTypical $171Pricier

Pricier than 74% of homes nearby

Living area1,770 ft²
SmallerTypical 1,632 ft²Bigger

Bigger than 60% of homes nearby

Lot size0.23 ac
SmallerTypical 0.4 acBigger

Bigger than 23% of homes nearby

Year built1949
OlderTypical 1956Newer

Newer than 43% of homes nearby

How 511 12th St ranks against every home in each area.
MeasureThis homeAlton 51003Sioux County
Estimated valuepricier than$393,91579% of homes76% of homes
Price per ft²pricier than$22374% of homes65% of homes
Living areabigger than1,770 ft²60% of homes70% of homes
Lot sizebigger than0.23 ac23% of homes24% of homes
Year builtnewer than194943% of homes35% of homes

About 511 12th St

How much is 511 12th St, Alton, IA worth?

The TopHap Estimate for 511 12th St, Alton, IA is $393,915 as of Aug 30, 2026. The likely range is $328,194 to $459,636. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 511 12th St, Alton, IA last sell?

511 12th St, Alton, IA last sold on Jun 8, 2010 for $1,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 511 12th St, Alton, IA?

511 12th St, Alton, IA has 1 bathrooms, 1,770 square feet of living space and a 0.23-acre lot.

When was 511 12th St, Alton, IA built?

511 12th St, Alton, IA was built in 1949, making it 77 years old. The building has 1 story.

What schools serve 511 12th St, Alton, IA?

511 12th St, Alton, IA is assigned to Moc-Floyd Valley Middle School (middle), rated B; Moc-Floyd Valley Elementary School (elementary), rated B+; Moc-Floyd Valley High School (high), rated A-. All sit in Moc-Floyd Valley Community School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 511 12th St, Alton, IA compare to other homes in Alton 51003?

Among the 670 homes in Alton 51003, it is worth more than 79% of them ($393,915 against a typical $260,554), its price per square foot is higher than 74% of them ($223 against a typical $171), it is bigger than 60% of them (1,770 ft² against a typical 1,632 ft²), its lot is bigger than 23% of them (0.23 ac against a typical 0.4 ac) and it is newer than 43% of them (1949 against a typical 1956). Measured against all of Sioux County, it is worth more than 76% 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 511 12th St, Alton, IA?

The 2025 property tax bill for 511 12th St, Alton, IA was $3,580. The county assessed it at $263,890.

More homes on 12th St

Closest homes

More homes in Alton 51003

Assigned schools

Explore the area

See this home in context

Open 511 12th 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