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Rural ResidenceResidential
$552,690
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 91How 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 $12,500,000 on Apr 22, 2015

4201 COUNTY ROAD 123

ROUND ROCK, TX 78664
0
Baths
5.28 ac
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$553K
$501K low$604K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$12,500,000 · Apr 22, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,483 (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.$86,435 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$83,477
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$567,687

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.67
94
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
49
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
99
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
49
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
46
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.65 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Rural Residence
CountyWILLIAMSON
PoolWhether the property has a pool, and what kind, such as in-ground.No

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
Gus Almquist Middle School
Middle · Grades 6–8 · 1.9 mi
E
Benjamin "Doc" Kerley Elementary SchoolB
Elementary · Grades PK–5 · 2.2 mi
H
Hutto High SchoolC
High · Grades 10–12 · 2.5 mi

District: Hutto Independent School District

Neighborhood · ZIP 78664These 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.87
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.13

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.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.6%
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.72,016
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,336 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,209
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$105,122
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

4201 County Road 123 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 89% of homes in Round Rock 78664
  • Among the largest lots in Round Rock 78664

What homes are worth in Round Rock 78664

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

This home
$225K$880K

This home is worth more than 89% of homes in Round Rock 78664.

How it measures up in Round Rock 78664

The dot is this home. The mark in the middle is the typical home in Round Rock 78664.

Estimated value$552,690
CheaperTypical $330,787Pricier

Pricier than 89% of homes nearby

Lot size5.28 ac
SmallerTypical 0.18 acBigger

Bigger than almost all homes nearby

How 4201 County Road 123 ranks against every home in each area.
MeasureThis homeRound Rock 78664Williamson County
Estimated valuepricier than$552,69089% of homes77% of homes
Lot sizebigger than5.28 acalmost all homes96% of homes

About 4201 County Road 123

How much is 4201 County Road 123, Round Rock, TX worth?

The TopHap Estimate for 4201 County Road 123, Round Rock, TX is $552,690 as of Aug 30, 2026. The likely range is $500,916 to $604,464. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4201 County Road 123, Round Rock, TX last sell?

4201 County Road 123, Round Rock, TX last sold on Apr 22, 2015 for $12,500,000, according to the county's recorded deed.

What schools serve 4201 County Road 123, Round Rock, TX?

4201 County Road 123, Round Rock, TX is assigned to Gus Almquist Middle School (middle); Benjamin "Doc" Kerley Elementary School (elementary), rated B; Hutto High School (high), rated C. All sit in Hutto Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4201 County Road 123, Round Rock, TX compare to other homes in Round Rock 78664?

Among the 16,951 homes in Round Rock 78664, it is worth more than 89% of them ($552,690 against a typical $330,787) and its lot is bigger than almost all of them (5.28 ac against a typical 0.18 ac). Measured against all of Williamson 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 4201 County Road 123, Round Rock, TX?

The 2025 property tax bill for 4201 County Road 123, Round Rock, TX was $1,483. The county assessed it at $86,435.

More homes on County Road 123

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More homes in Round Rock 78664

Assigned schools

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