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Single Family ResidenceResidential
$373,267$158 / 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 Oct 21, 2026

16921 TORTOISE ST

ROUND ROCK, TX 78664
2
Baths
2,366 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.
1998
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

$373K
$359K low$387K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,681 (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.$399,051 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$107,478
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$291,573
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$389,531
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$399,051

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.17 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Single Family Residence
CountyTRAVIS
Lot (acres)The size of the land the home sits on, from county records.0.22
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Mat/Raft Foundation (Slab)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
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 · 150 ft²Porch · 134 ft²

Transaction History(6)

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.

E
Fannie Mae Caldwell Elementary SchoolC+
Elementary · Grades PK–5 · 0.6 mi
M
Pflugerville Middle SchoolC
Middle · Grades 6–8 · 1.5 mi
H
Pflugerville High SchoolC
High · Grades 9–12 · 1.6 mi

District: Pflugerville 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

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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

16921 Tortoise St 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 70% of homes in Round Rock 78664
  • Costs less per square foot than 93% of homes in Travis County
  • Bigger than 77% of homes in Round Rock 78664
  • Has a bigger lot than 70% of homes 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
$222K$804K

This home is worth more than 70% 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$373,267
CheaperTypical $319,096Pricier

Pricier than 70% of homes nearby

Price per ft²$158
CheaperTypical $191Pricier

Pricier than 17% of homes nearby

Living area2,366 ft²
SmallerTypical 1,778 ft²Bigger

Bigger than 77% of homes nearby

Lot size0.22 ac
SmallerTypical 0.18 acBigger

Bigger than 70% of homes nearby

Year built1998
OlderTypical 1998Newer

Newer than 52% of homes nearby

How 16921 Tortoise St ranks against every home in each area.
MeasureThis homeRound Rock 78664Travis County
Estimated valuepricier than$373,26770% of homes33% of homes
Price per ft²pricier than$15817% of homes7% of homes
Living areabigger than2,366 ft²77% of homes70% of homes
Lot sizebigger than0.22 ac70% of homes64% of homes
Year builtnewer than199852% of homes49% of homes

About 16921 Tortoise St

How much is 16921 Tortoise St, Round Rock, TX worth?

The TopHap Estimate for 16921 Tortoise St, Round Rock, TX is $373,267 as of Oct 21, 2026. The likely range is $359,129 to $387,405. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 16921 Tortoise St, Round Rock, TX last sell?

16921 Tortoise St, Round Rock, TX last sold on Apr 9, 2026, according to the county's recorded deed.

How big is 16921 Tortoise St, Round Rock, TX?

16921 Tortoise St, Round Rock, TX has 2 bathrooms, 2,366 square feet of living space and a 0.22-acre lot.

When was 16921 Tortoise St, Round Rock, TX built?

16921 Tortoise St, Round Rock, TX was built in 1998, making it 28 years old. The building has 1 story.

What schools serve 16921 Tortoise St, Round Rock, TX?

16921 Tortoise St, Round Rock, TX is assigned to Fannie Mae Caldwell Elementary School (elementary), rated C+; Pflugerville Middle School (middle), rated C; Pflugerville High School (high), rated C. All sit in Pflugerville Independent School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 16921 Tortoise St, Round Rock, TX compare to other homes in Round Rock 78664?

Among the 16,307 homes in Round Rock 78664, it is worth more than 70% of them ($373,267 against a typical $319,096), its price per square foot is higher than 17% of them ($158 against a typical $191), it is bigger than 77% of them (2,366 ft² against a typical 1,778 ft²), its lot is bigger than 70% of them (0.22 ac against a typical 0.18 ac) and it is newer than 52% of them (1998 against a typical 1998). Measured against all of Travis County, it is worth more than 33% 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 16921 Tortoise St, Round Rock, TX?

The 2025 property tax bill for 16921 Tortoise St, Round Rock, TX was $8,681. The county assessed it at $399,051.

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