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1613/1615 WHIRLWIND TRL, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

3 bed4 bath1,971 sqftBuilt 1986

Property at a Glance

This home is estimated between $336,470 and $416,920, with a best estimate of $405,098. That places the property above the R450X - Round Rock East - Duplex median of $355,449, in a neighborhood that declined 8.7% over the past year.

Estimated Value Range

$336,470 $416,920
Best Estimate
$405,098
WCAD Value
$414,021
Low Confidence

Based on 5 comparable properties(0 in the same subdivision)

There are 5 comparable properties within range, but none are in R450X - Round Rock East - Duplex. The estimated range of $336,470 and $416,920 should be treated as a rough guide.

Comparable Properties (5)

3 bed 2 bath 1,946 sqft Built 1999
Raw Value $358,711
Adjusted Value $350,567

Adjusted +$4,858 for 25 sqft more living space and -$13,002 for being older. Net adjustment: -$8,144.

3 bed 2 bath 1,920 sqft Built 1999
Raw Value $339,562
Adjusted Value $336,470

Adjusted +$9,910 for 51 sqft more living space and -$13,002 for being older. Net adjustment: -$3,092.

4 bed 2 bath 1,942 sqft Built 1979
Raw Value $392,462
Adjusted Value $405,098

Adjusted +$5,635 for 29 sqft more living space and +$7,001 for being newer. Net adjustment: +$12,636.

3 bed 2 bath 1,676 sqft Built 1975
Raw Value $348,596
Adjusted Value $416,920

Adjusted +$57,322 for 295 sqft more living space and +$11,002 for being newer. Net adjustment: +$68,324.

3 bed 2 bath 1,730 sqft Built 2000
Raw Value $381,938
Adjusted Value $414,765

Adjusted +$46,829 for 241 sqft more living space and -$14,002 for being older. Net adjustment: +$32,827.

The Neighborhood

This home is valued 16.5% above the R450X - Round Rock East - Duplex median of $355,449. With 836 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 8.7% over the past year.

R450X - Round Rock East - Duplex

above average
836 Properties
$355,449 Median Value
-8.7% YoY Change
0% Have Pool
84% Have Garage
This Home
$414,021
Median
$355,449

This home is +16.5% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,449 across all districts. With a homestead exemption claimed, that drops to $6,123 — saving $1,326 per year. That's $510 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%$3,698
Round RockCity0.3720%$1,540
Williamson CountyCounty0.3694%$1,530
Austin Community Collegespecial0.1034%$428
Williamson County FM/RdCounty0.0443%$184
Upper Brushy Creek WCIDWater0.0170%$70
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$7,449

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $405,098 would pay approximately $2,529 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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