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

599 S MAYS ST, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

Property at a Glance

There are not enough comparable properties nearby to estimate a price range. The Williamson County Appraisal District values this home at $554,107.

Estimated Value Range

WCAD Appraised Value $554,107

Comparable data is not yet available for this property. The Williamson County Appraisal District values it at $554,107.

The Neighborhood

This home is valued 244.0% above the R20QN - Rr East Nom-imp median of $161,063. With 7 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 12.6% over the past year.

R20QN - Rr East Nom-imp

outlier high
7 Properties
$161,063 Median Value
-12.6% YoY Change
0% Have Pool
0% Have Garage
This Home
$554,107
Median
$161,063

This home is +244.0% above the subdivision median.

Tax Analysis

The estimated annual property tax is $9,970 across all districts. With a homestead exemption claimed, that drops to $8,617 — saving $1,353 per year. That's $718 per month a buyer should budget. The assessed value increased 0.0% vs the subdivision average of -12.6%. This above-average increase gives a protest opportunity score of 50 out of 100 — it may be worth challenging the appraisal.

Tax Districts

DistrictTypeRateAnnual Amount
Round Rock ISDSchool0.8931%$4,949
Round RockCity0.3720%$2,061
Williamson CountyCounty0.3694%$2,047
Austin Community Collegespecial0.1034%$573
Williamson County FM/RdCounty0.0443%$246
Upper Brushy Creek WCIDWater0.0170%$94
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$9,970
50 / 100

Moderate opportunity to protest.

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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