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Single Family ResidenceResidential
$573,739$210 / 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 96How 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

520 KOLBO DR

ROUND ROCK, TX 78665
3
Baths
2,738 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.
0.22 ac
Lot SizeThe size of the land the home sits on, from county records.
2017
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

$574K
$553K low$594K 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.$282,955
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$226,364
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.49%
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.$290,784
KBHS HM LNS LLC · recorded Mar 22, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,080 (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.$613,344 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$137,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$476,344
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$613,344
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$613,344

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.76 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
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.0.2 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.Single Family 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.2019
Lot (acres)The size of the land the home sits on, from county records.0.22
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Mat/Raft Foundation (Slab)
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 440 ft²

Transaction History(2)

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
Ridgeview Middle SchoolA-
Middle · Grades 6–8 · 1.5 mi
E
Blackland Prairie Elementary SchoolA-
Elementary · Grades KG–5 · 1.5 mi
H
Cedar Ridge High SchoolB
High · Grades 9–12 · 2.3 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.68,564
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.$112,731
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$135,299
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

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
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

520 Kolbo Dr 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 85% of homes in Round Rock 78665
  • Costs more per square foot than 84% of homes in Round Rock 78665
  • Smaller than 78% of homes in Forest Grove
  • Has a bigger lot than 76% of homes in Round Rock 78665
  • Newer than 72% of homes in Williamson County

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
$285K$809K

This home is worth more than 85% 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$573,739
CheaperTypical $412,248Pricier

Pricier than 85% of homes nearby

Price per ft²$210
CheaperTypical $185Pricier

Pricier than 84% of homes nearby

Living area2,738 ft²
SmallerTypical 2,310 ft²Bigger

Bigger than 69% of homes nearby

Lot size0.22 ac
SmallerTypical 0.18 acBigger

Bigger than 76% of homes nearby

Year built2017
OlderTypical 2010Newer

Newer than 71% of homes nearby

How 520 Kolbo Dr ranks against every home in each area.
MeasureThis homeForest GroveRound Rock 78665Williamson County
Estimated valuepricier than$573,73917% of homes85% of homes79% of homes
Price per ft²pricier than$21054% of homes84% of homes58% of homes
Living areabigger than2,738 ft²22% of homes69% of homes76% of homes
Lot sizebigger than0.22 ac30% of homes76% of homes57% of homes
Year builtnewer than201755% of homes71% of homes72% of homes

About 520 Kolbo Dr

How much is 520 Kolbo Dr, Round Rock, TX worth?

The TopHap Estimate for 520 Kolbo Dr, Round Rock, TX is $573,739 as of Jul 14, 2026. The likely range is $553,130 to $594,348. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 520 Kolbo Dr, Round Rock, TX last sell?

520 Kolbo Dr, Round Rock, TX last sold on Mar 22, 2018, according to the county's recorded deed.

How big is 520 Kolbo Dr, Round Rock, TX?

520 Kolbo Dr, Round Rock, TX has 3 bathrooms, 2,738 square feet of living space and a 0.22-acre lot.

When was 520 Kolbo Dr, Round Rock, TX built?

520 Kolbo Dr, Round Rock, TX was built in 2017, making it 9 years old. The building has 1 story.

What schools serve 520 Kolbo Dr, Round Rock, TX?

520 Kolbo Dr, Round Rock, TX is assigned to Ridgeview Middle School (middle), rated A-; Blackland Prairie Elementary School (elementary), rated A-; Cedar Ridge High School (high), rated B. All sit in Round Rock Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 520 Kolbo Dr, Round Rock, TX compare to other homes in Round Rock 78665?

Among the 20,792 homes in Round Rock 78665, it is worth more than 85% of them ($573,739 against a typical $412,248), its price per square foot is higher than 84% of them ($210 against a typical $185), it is bigger than 69% of them (2,738 ft² against a typical 2,310 ft²), its lot is bigger than 76% of them (0.22 ac against a typical 0.18 ac) and it is newer than 71% of them (2017 against a typical 2010). Measured against all of Williamson County, it is worth more than 79% 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 520 Kolbo Dr, Round Rock, TX?

The 2025 property tax bill for 520 Kolbo Dr, Round Rock, TX was $4,080. The county assessed it at $613,344.

More homes on Kolbo Dr

Closest homes

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Assigned schools

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