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Single Family ResidenceResidential
$320,177$139 / 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 92How 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

3426 SANDY KOUFAX LN

ROUND ROCK, TX 78665
2.5
Baths
2,296 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.
0.19 ac
Lot SizeThe size of the land the home sits on, from county records.
2003
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$320K
$294K low$346K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,581 (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.$349,390 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$77,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$272,390
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$384,024
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$349,390

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyWILLIAMSON
Lot (acres)The size of the land the home sits on, from county records.0.19
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
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 · 288 ft²

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

H
Stony Point High SchoolC+
High · Grades 9–12 · 2.5 mi
M
Hernandez Middle SchoolD+
Middle · Grades 6–8 · 2.8 mi
E
Redbud Elementary SchoolA-
Elementary · Grades PK–5 · 4.9 mi

District: Round Rock Independent School District

Neighborhood · ZIP 78665These 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.50
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.86
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.17

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.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.68,549
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,056 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$112,722
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$135,285
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%

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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

3426 Sandy Koufax Ln 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 less than 82% of homes in Round Rock 78665
  • Costs less per square foot than 95% of homes in Williamson County
  • Older than 72% of homes in Round Rock 78665

What homes are worth in Round Rock 78665

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

This home
$275K$765K

This home is worth more than 18% of homes in Round Rock 78665.

How it measures up in Round Rock 78665

The dot is this home. The mark in the middle is the typical home in Round Rock 78665.

Estimated value$320,177
CheaperTypical $392,545Pricier

Pricier than 18% of homes nearby

Price per ft²$139
CheaperTypical $176Pricier

Pricier than 7% of homes nearby

Living area2,296 ft²
SmallerTypical 2,317 ft²Bigger

Bigger than 49% of homes nearby

Lot size0.19 ac
SmallerTypical 0.18 acBigger

Bigger than 60% of homes nearby

Year built2003
OlderTypical 2011Newer

Newer than 28% of homes nearby

How 3426 Sandy Koufax Ln ranks against every home in each area.
MeasureThis homeRound Rock 78665Williamson County
Estimated valuepricier than$320,17718% of homes25% of homes
Price per ft²pricier than$1397% of homes5% of homes
Living areabigger than2,296 ft²49% of homes59% of homes
Lot sizebigger than0.19 ac60% of homes48% of homes
Year builtnewer than200328% of homes42% of homes

About 3426 Sandy Koufax Ln

How much is 3426 Sandy Koufax Ln, Round Rock, TX worth?

The TopHap Estimate for 3426 Sandy Koufax Ln, Round Rock, TX is $320,177 as of Oct 21, 2026. The likely range is $294,072 to $346,282. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3426 Sandy Koufax Ln, Round Rock, TX last sell?

3426 Sandy Koufax Ln, Round Rock, TX last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 3426 Sandy Koufax Ln, Round Rock, TX?

3426 Sandy Koufax Ln, Round Rock, TX has 2.5 bathrooms, 2,296 square feet of living space and a 0.19-acre lot.

When was 3426 Sandy Koufax Ln, Round Rock, TX built?

3426 Sandy Koufax Ln, Round Rock, TX was built in 2003, making it 23 years old. The building has 2 stories.

What schools serve 3426 Sandy Koufax Ln, Round Rock, TX?

3426 Sandy Koufax Ln, Round Rock, TX is assigned to Stony Point High School (high), rated C+; Hernandez Middle School (middle), rated D+; Redbud Elementary School (elementary), rated A-. All sit in Round Rock Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3426 Sandy Koufax Ln, Round Rock, TX compare to other homes in Round Rock 78665?

Among the 20,800 homes in Round Rock 78665, it is worth more than 18% of them ($320,177 against a typical $392,545), its price per square foot is higher than 7% of them ($139 against a typical $176), it is bigger than 49% of them (2,296 ft² against a typical 2,317 ft²), its lot is bigger than 60% of them (0.19 ac against a typical 0.18 ac) and it is newer than 28% of them (2003 against a typical 2011). Measured against all of Williamson County, it is worth more than 25% 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 3426 Sandy Koufax Ln, Round Rock, TX?

The 2025 property tax bill for 3426 Sandy Koufax Ln, Round Rock, TX was $5,581. The county assessed it at $349,390.

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