Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$986,306$195 / 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 88How 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

4231 COUNTY ROAD 123

ROUND ROCK, TX 78664
2
Baths
5,061 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.
1.75 ac
Lot SizeThe size of the land the home sits on, from county records.
1984
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$986K
$868K low$1.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,413 (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.$598,269 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$543,881
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$835,108

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.68
100
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
50
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.173 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.Single Family Residence
CountyWILLIAMSON
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
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.Patio · 64 ft²Porch · 754 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
Gus Almquist Middle School
Middle · Grades 6–8 · 1.4 mi
E
Benjamin "Doc" Kerley Elementary SchoolB
Elementary · Grades PK–5 · 1.7 mi
H
Hutto High SchoolC
High · Grades 10–12 · 2.3 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%

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

4231 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.

  • Among the most valuable homes in Round Rock 78664
  • Among the largest homes in Round Rock 78664
  • Among the largest lots in Round Rock 78664
  • Older than 87% of homes in Williamson County

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 almost all 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$986,306
CheaperTypical $330,787Pricier

Pricier than almost all homes nearby

Price per ft²$195
CheaperTypical $197Pricier

Pricier than 48% of homes nearby

Living area5,061 ft²
SmallerTypical 1,765 ft²Bigger

Bigger than almost all homes nearby

Lot size1.75 ac
SmallerTypical 0.18 acBigger

Bigger than almost all homes nearby

Year built1984
OlderTypical 1998Newer

Newer than 24% of homes nearby

How 4231 County Road 123 ranks against every home in each area.
MeasureThis homeRound Rock 78664Williamson County
Estimated valuepricier than$986,306almost all homes97% of homes
Price per ft²pricier than$19548% of homes45% of homes
Living areabigger than5,061 ft²almost all homesalmost all homes
Lot sizebigger than1.75 acalmost all homes92% of homes
Year builtnewer than198424% of homes13% of homes

About 4231 County Road 123

How much is 4231 County Road 123, Round Rock, TX worth?

The TopHap Estimate for 4231 County Road 123, Round Rock, TX is $986,306 as of Aug 30, 2026. The likely range is $867,985 to $1,104,627. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4231 County Road 123, Round Rock, TX last sell?

4231 County Road 123, Round Rock, TX last sold on Dec 28, 2012, according to the county's recorded deed.

How big is 4231 County Road 123, Round Rock, TX?

4231 County Road 123, Round Rock, TX has 2 bathrooms and 5,061 square feet of living space.

When was 4231 County Road 123, Round Rock, TX built?

4231 County Road 123, Round Rock, TX was built in 1984, making it 42 years old. The building has 1 story.

What schools serve 4231 County Road 123, Round Rock, TX?

4231 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 4231 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 almost all of them ($986,306 against a typical $330,787), its price per square foot is higher than 48% of them ($195 against a typical $197), it is bigger than almost all of them (5,061 ft² against a typical 1,765 ft²), its lot is bigger than almost all of them (1.75 ac against a typical 0.18 ac) and it is newer than 24% of them (1984 against a typical 1998). Measured against all of Williamson County, it is worth more than 97% 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 4231 County Road 123, Round Rock, TX?

The 2025 property tax bill for 4231 County Road 123, Round Rock, TX was $3,413. The county assessed it at $598,269.

More homes on County Road 123

Closest homes

More homes in Round Rock 78664

Assigned schools

Explore the area

See this home in context

Open 4231 County Road 123 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