Beta Williamson County, TX only — data and coverage are limited during early access.

504/506 GREGORY CT, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

4 bed3 bath2,121 sqftBuilt 1995

Property at a Glance

This home is estimated between $403,352 and $622,710, with a best estimate of $478,891. 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

$403,352 $622,710
Best Estimate
$478,891
WCAD Value
$392,108
Medium Confidence

Based on 5 comparable properties(3 in the same subdivision)

Based on 5 comparable properties (3 in the same subdivision, 2 nearby), the estimated range is $403,352 and $622,710. More comparables in the same subdivision would strengthen this estimate.

Comparable Properties (5)

413/415 COUNTRY AIRE DR, ROUND ROCK, TX 78664
0.22 mi 96% similar Same subdivision
3 bed 4 bath 1,675 sqft Built 1985
Raw Value $340,439
Adjusted Value $478,891

Adjusted +$86,663 for 446 sqft more living space and +$10,002 for being newer and +$41,787 for having a garage. Net adjustment: +$138,452.

410/412 PARKHILL CV, ROUND ROCK, TX 78664
0.17 mi 89% similar Same subdivision
5 bed 4 bath 1,191 sqft Built 1984
Raw Value $398,770
Adjusted Value $590,483

Adjusted +$180,711 for 930 sqft more living space and +$11,002 for being newer. Net adjustment: +$191,713.

4 bed 2 bath 1,586 sqft Built 2008
Raw Value $531,755
Adjusted Value $622,710

Adjusted +$103,957 for 535 sqft more living space and -$13,002 for being older. Net adjustment: +$90,955.

508 GREGORY CT, ROUND ROCK, TX 78664
0.03 mi 84% similar Same subdivision
2 bed 2 bath 1,025 sqft Built 1994
Raw Value $213,088
Adjusted Value $427,054

Adjusted +$212,966 for 1,096 sqft more living space and +$1,000 for being newer. Net adjustment: +$213,966.

3 bed 2 bath 1,634 sqft Built 1984
Raw Value $297,720
Adjusted Value $403,352

Adjusted +$94,630 for 487 sqft more living space and +$11,002 for being newer. Net adjustment: +$105,632.

The Neighborhood

This home is valued 10.3% 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

typical
836 Properties
$355,449 Median Value
-8.7% YoY Change
0% Have Pool
84% Have Garage
This Home
$392,108
Median
$355,449

This home is +10.3% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,055 across all districts. With a homestead exemption claimed, that drops to $5,732 — saving $1,323 per year. That's $478 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%$3,502
Round RockCity0.3720%$1,459
Williamson CountyCounty0.3694%$1,449
Austin Community Collegespecial0.1034%$405
Williamson County FM/RdCounty0.0443%$174
Upper Brushy Creek WCIDWater0.0170%$67
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$7,055

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $478,891 would pay approximately $2,989 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.

View full property details