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Rural ResidenceResidential
$2,027,598$351 / 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 76How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026

4435 COUNTY ROAD 123

ROUND ROCK, TX 78664
5
Baths
5,776 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.
40.98 ac
Lot SizeThe size of the land the home sits on, from county records.
1985
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$2M
$1.5M low$2.5M high
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$69,598
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$55,678
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.99%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$1,958,000
FIRST COMMUNITY BANK · recorded May 26, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$54,517 (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.$3,289,550 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,784,631
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,504,919
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$3,289,550
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,289,550

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.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.1 percent flood zone

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
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.2006
Lot (acres)The size of the land the home sits on, from county records.40.98
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Pier/Post & Beam
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
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Pool housePorch · 2,573 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
H
Hutto High SchoolC
High · Grades 10–12 · 1.6 mi
E
Benjamin "Doc" Kerley Elementary SchoolB
Elementary · Grades PK–5 · 1.7 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%

Ownership

Company ownedWhether the owner is a company or trust rather than a person.Yes

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

4435 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
  • Costs more per square foot than 98% of homes in Williamson County
  • Among the largest homes in Round Rock 78664
  • Among the largest lots in Round Rock 78664
  • Older than 86% 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
$224K$917K

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$2,027,598
CheaperTypical $337,883Pricier

Pricier than almost all homes nearby

Price per ft²$351
CheaperTypical $199Pricier

Pricier than 96% of homes nearby

Living area5,776 ft²
SmallerTypical 1,764 ft²Bigger

Bigger than almost all homes nearby

Lot size40.98 ac
SmallerTypical 0.18 acBigger

Bigger than almost all homes nearby

Year built1985
OlderTypical 1998Newer

Newer than 28% of homes nearby

How 4435 County Road 123 ranks against every home in each area.
MeasureThis homeRound Rock 78664Williamson County
Estimated valuepricier than$2,027,598almost all homesalmost all homes
Price per ft²pricier than$35196% of homes98% of homes
Living areabigger than5,776 ft²almost all homesalmost all homes
Lot sizebigger than40.98 acalmost all homesalmost all homes
Year builtnewer than198528% of homes14% of homes

About 4435 County Road 123

How much is 4435 County Road 123, Round Rock, TX worth?

The TopHap Estimate for 4435 County Road 123, Round Rock, TX is $2,027,598 as of Jul 14, 2026. The likely range is $1,532,013 to $2,523,183. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4435 County Road 123, Round Rock, TX last sell?

4435 County Road 123, Round Rock, TX last sold on May 26, 2023, according to the county's recorded deed.

How big is 4435 County Road 123, Round Rock, TX?

4435 County Road 123, Round Rock, TX has 5 bathrooms, 5,776 square feet of living space and a 40.98-acre lot.

When was 4435 County Road 123, Round Rock, TX built?

4435 County Road 123, Round Rock, TX was built in 1985, making it 41 years old. The building has 2 stories.

What schools serve 4435 County Road 123, Round Rock, TX?

4435 County Road 123, Round Rock, TX is assigned to Gus Almquist Middle School (middle); Hutto High School (high), rated C; Benjamin "Doc" Kerley Elementary School (elementary), rated B. All sit in Hutto Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4435 County Road 123, Round Rock, TX compare to other homes in Round Rock 78664?

Among the 17,092 homes in Round Rock 78664, it is worth more than almost all of them ($2,027,598 against a typical $337,883), its price per square foot is higher than 96% of them ($351 against a typical $199), it is bigger than almost all of them (5,776 ft² against a typical 1,764 ft²), its lot is bigger than almost all of them (40.98 ac against a typical 0.18 ac) and it is newer than 28% of them (1985 against a typical 1998). Measured against all of Williamson County, it is worth more than almost all 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 4435 County Road 123, Round Rock, TX?

The 2025 property tax bill for 4435 County Road 123, Round Rock, TX was $54,517. The county assessed it at $3,289,550.

More homes on County Road 123

Closest homes

More homes in Round Rock 78664

Assigned schools

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