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Single Family ResidenceResidential
$481,454$271 / 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 89How 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 $449,540 on Dec 1, 2022

5121 E 21ST S

AMMON, ID 83401
3
Beds
1
Baths
1,774 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.
3.22 ac
Lot SizeThe size of the land the home sits on, from county records.
1920
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
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

$481K
$427K low$536K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$449,540 · Dec 1, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,160 (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.$438,070 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$44,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$393,670
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$376,460
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$438,070

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyBONNEVILLE
Lot (acres)The size of the land the home sits on, from county records.3.22
RoofThe main material covering the roof, such as asphalt shingle or tile.Shingle
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.None
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, Detached
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.DeckShed · 320 ft²

Transaction History(2)

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
Rimrock Elementary SchoolA
Elementary · Grades KG–6 · 0.2 mi
M
Black Canyon Middle SchoolD+
Middle · Grades 7–8 · 1.4 mi
H
Thunder Ridge High SchoolA
High · Grades 9–12 · 1.4 mi

District: Bonneville Joint School District 93

Neighborhood · ZIP 83401These 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.81
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.111
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.129

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.21%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.54,367
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.273 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$73,220
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$93,243
Average tempThe average temperature here across a full year.42°F
Annual precipHow much rain and melted snow falls here in a typical year.17 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.64%

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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

5121 E 21st S 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 Idaho Falls 83401
  • Costs more per square foot than 95% of homes in Idaho Falls 83401
  • Has a bigger lot than 94% of homes in Idaho Falls 83401
  • Older than 96% of homes in Idaho Falls 83401

What homes are worth in Idaho Falls 83401

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

This home
$120K$746K

This home is worth more than 86% of homes in Idaho Falls 83401.

How it measures up in Idaho Falls 83401

The dot is this home. The mark in the middle is the typical home in Idaho Falls 83401.

Estimated value$481,454
CheaperTypical $296,496Pricier

Pricier than 86% of homes nearby

Price per ft²$271
CheaperTypical $148Pricier

Pricier than 95% of homes nearby

Living area1,774 ft²
SmallerTypical 1,977 ft²Bigger

Bigger than 42% of homes nearby

Lot size3.22 ac
SmallerTypical 0.28 acBigger

Bigger than 94% of homes nearby

Year built1920
OlderTypical 1993Newer

Newer than 4% of homes nearby

How 5121 E 21st S ranks against every home in each area.
MeasureThis homeIdaho Falls 83401Bonneville County
Estimated valuepricier than$481,45486% of homes81% of homes
Price per ft²pricier than$27195% of homes93% of homes
Living areabigger than1,774 ft²42% of homes37% of homes
Lot sizebigger than3.22 ac94% of homes94% of homes
Year builtnewer than19204% of homes5% of homes

About 5121 E 21st S

How much is 5121 E 21st S, Ammon, ID worth?

The TopHap Estimate for 5121 E 21st S, Ammon, ID is $481,454 as of Aug 30, 2026. The likely range is $426,544 to $536,364. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 5121 E 21st S, Ammon, ID last sell?

5121 E 21st S, Ammon, ID last sold on Dec 1, 2022 for $449,540, according to the county's recorded deed.

How big is 5121 E 21st S, Ammon, ID?

5121 E 21st S, Ammon, ID has 3 bedrooms, 1 bathrooms, 1,774 square feet of living space and a 3.22-acre lot.

When was 5121 E 21st S, Ammon, ID built?

5121 E 21st S, Ammon, ID was built in 1920, making it 106 years old. The building has 1 story.

What schools serve 5121 E 21st S, Ammon, ID?

5121 E 21st S, Ammon, ID is assigned to Rimrock Elementary School (elementary), rated A; Black Canyon Middle School (middle), rated D+; Thunder Ridge High School (high), rated A. All sit in Bonneville Joint School District 93. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 5121 E 21st S, Ammon, ID compare to other homes in Idaho Falls 83401?

Among the 15,390 homes in Idaho Falls 83401, it is worth more than 86% of them ($481,454 against a typical $296,496), its price per square foot is higher than 95% of them ($271 against a typical $148), it is bigger than 42% of them (1,774 ft² against a typical 1,977 ft²), its lot is bigger than 94% of them (3.22 ac against a typical 0.28 ac) and it is newer than 4% of them (1920 against a typical 1993). Measured against all of Bonneville County, it is worth more than 81% 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 5121 E 21st S, Ammon, ID?

The 2025 property tax bill for 5121 E 21st S, Ammon, ID was $2,160. The county assessed it at $438,070.

More homes on E 21st S

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