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3421 AQUAMARINE DR, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,134 sqftBuilt 2009

Property at a Glance

This home is estimated between $720,131 and $902,831, with a best estimate of $764,696. That places the property below the R147606C - WALSH RANCH median of $933,667, in a neighborhood that declined 4.6% over the past year.

Estimated Value Range

$720,131 $902,831
Best Estimate
$764,696
WCAD Value
$961,744
Low Confidence

Based on 5 comparable properties(1 in the same subdivision)

There are 5 comparable properties within range, but few are in R147606C - WALSH RANCH. The estimated range of $720,131 and $902,831 should be treated as a rough guide.

Comparable Properties (5)

3323 MARCASITE DR, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,219 sqft Built 2007
Raw Value $904,649
Adjusted Value $842,296

Adjusted -$34,563 for 85 sqft less living space and -$27,790 for being older. Net adjustment: -$62,353.

4 bed 3 bath 2,154 sqft Built 2001
Raw Value $860,722
Adjusted Value $741,428

Adjusted -$8,133 for 20 sqft less living space and -$111,161 for being older. Net adjustment: -$119,294.

4 bed 3 bath 1,916 sqft Built 2014
Raw Value $562,011
Adjusted Value $720,131

Adjusted +$88,644 for 218 sqft more living space and +$69,476 for being newer. Net adjustment: +$158,120.

4 bed 3 bath 1,916 sqft Built 2016
Raw Value $578,786
Adjusted Value $764,696

Adjusted +$88,644 for 218 sqft more living space and +$97,266 for being newer. Net adjustment: +$185,910.

4 bed 3 bath 1,811 sqft Built 2014
Raw Value $702,015
Adjusted Value $902,831

Adjusted +$131,340 for 323 sqft more living space and +$69,476 for being newer. Net adjustment: +$200,816.

The Neighborhood

This home is valued 3.0% above the R147606C - WALSH RANCH median of $933,667. With 239 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 4.6% over the past year.

R147606C - WALSH RANCH

typical
239 Properties
$933,667 Median Value
-4.6% YoY Change
0% Have Pool
100% Have Garage
This Home
$961,744
Median
$933,667

This home is +3.0% above the subdivision median.

Tax Analysis

The estimated annual property tax is $17,639 across all districts. With a homestead exemption claimed, that drops to $16,215 — saving $1,424 per year. That's $1,351 per month a buyer should budget. The assessed value increased roughly in line with the neighborhood, so a tax protest is unlikely to yield significant savings.

Tax Districts

DistrictTypeRateAnnual Amount
Round Rock ISDSchool0.8931%$8,412
Williamson CountyCounty0.3694%$3,480
Walsh Ranch MUDMUD0.3455%$3,254
Austin Community Collegespecial0.1034%$974
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$942
Williamson County FM/RdCounty0.0443%$418
Upper Brushy Creek WCIDWater0.0170%$160
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8728%$17,639

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $764,696 would pay approximately $4,773 per month (principal and interest only, excluding taxes and insurance).

Data sourced from Williamson County Appraisal District (WCAD), Texas Education Agency (TEA), and Federal Reserve Economic Data (FRED). Assessment values reflect the appraisal district's estimate, not market sale prices. Report generated 4/18/2026.

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