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Single Family ResidenceResidential
$800,959$314 / 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 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $605,700 on Oct 15, 2018

12100 ONION HOLLOW RUN

AUSTIN, TX 78739
4
Beds
2
Baths
2,549 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.
1.15 ac
Lot SizeThe size of the land the home sits on, from county records.
1993
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$801K
$765K low$837K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$605,700 · Oct 15, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,359 (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.$622,241 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$256,003
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$366,238
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$765,372
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$622,241

Climate Risk

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.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
CountyTRAVIS
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Mat/Raft Foundation (Slab)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
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.Porch · 207 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.

M
Bailey Middle SchoolB
Middle · Grades 6–8 · 0.7 mi
E
Baranoff Elementary SchoolA
Elementary · Grades KG–5 · 0.8 mi
H
Bowie High SchoolA
High · Grades 9–12 · 2.2 mi

District: Austin Independent School District

Neighborhood · ZIP 78739These 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.11
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.80
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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.40%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.23,000
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,029 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$182,479
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$206,478
Average tempThe average temperature here across a full year.67°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.60%

Owner Tools

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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

12100 Onion Hollow Run 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 77% of homes in Travis County
  • Costs more per square foot than 78% of homes in Austin 78739
  • Bigger than 75% of homes in Travis County
  • Among the largest lots in Austin 78739
  • Older than 78% of homes in Austin 78739

What homes are worth in Austin 78739

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

This home
$544K$1.4M

This home is worth more than 44% of homes in Austin 78739.

How it measures up in Austin 78739

The dot is this home. The mark in the middle is the typical home in Austin 78739.

Estimated value$800,959
CheaperTypical $825,901Pricier

Pricier than 44% of homes nearby

Price per ft²$314
CheaperTypical $291Pricier

Pricier than 78% of homes nearby

Living area2,549 ft²
SmallerTypical 2,911 ft²Bigger

Bigger than 29% of homes nearby

Lot size1.15 ac
SmallerTypical 0.22 acBigger

Bigger than almost all homes nearby

Year built1993
OlderTypical 2003Newer

Newer than 22% of homes nearby

How 12100 Onion Hollow Run ranks against every home in each area.
MeasureThis homeAustin 78739Travis County
Estimated valuepricier than$800,95944% of homes77% of homes
Price per ft²pricier than$31478% of homes64% of homes
Living areabigger than2,549 ft²29% of homes75% of homes
Lot sizebigger than1.15 acalmost all homes94% of homes
Year builtnewer than199322% of homes42% of homes

About 12100 Onion Hollow Run

How much is 12100 Onion Hollow Run, Austin, TX worth?

The TopHap Estimate for 12100 Onion Hollow Run, Austin, TX is $800,959 as of Oct 21, 2026. The likely range is $764,740 to $837,178. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 12100 Onion Hollow Run, Austin, TX last sell?

12100 Onion Hollow Run, Austin, TX last sold on Oct 15, 2018 for $605,700, according to the county's recorded deed.

How big is 12100 Onion Hollow Run, Austin, TX?

12100 Onion Hollow Run, Austin, TX has 4 bedrooms, 2 bathrooms and 2,549 square feet of living space.

When was 12100 Onion Hollow Run, Austin, TX built?

12100 Onion Hollow Run, Austin, TX was built in 1993, making it 33 years old. The building has 1 story.

What schools serve 12100 Onion Hollow Run, Austin, TX?

12100 Onion Hollow Run, Austin, TX is assigned to Bailey Middle School (middle), rated B; Baranoff Elementary School (elementary), rated A; Bowie High School (high), rated A. All sit in Austin Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 12100 Onion Hollow Run, Austin, TX compare to other homes in Austin 78739?

Among the 7,014 homes in Austin 78739, it is worth more than 44% of them ($800,959 against a typical $825,901), its price per square foot is higher than 78% of them ($314 against a typical $291), it is bigger than 29% of them (2,549 ft² against a typical 2,911 ft²), its lot is bigger than almost all of them (1.15 ac against a typical 0.22 ac) and it is newer than 22% of them (1993 against a typical 2003). Measured against all of Travis County, it is worth more than 77% 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 12100 Onion Hollow Run, Austin, TX?

The 2025 property tax bill for 12100 Onion Hollow Run, Austin, TX was $10,359. The county assessed it at $622,241.

More homes on Onion Hollow Run

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