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

508 MAIN ST, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

2 bed1 bath1,074 sqftBuilt 1924

Property at a Glance

This home is estimated between $201,483 and $529,939, with a best estimate of $330,799. That places the property below the R703T14G - Round Rock Historical median of $404,269, in a neighborhood that appreciated 33.1% over the past year.

Estimated Value Range

$201,483 $529,939
Best Estimate
$330,799
WCAD Value
$431,184
Low Confidence

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

There are 5 comparable properties within range, but none are in R703T14G - Round Rock Historical. The estimated range of $201,483 and $529,939 should be treated as a rough guide.

Comparable Properties (5)

2 bed 1 bath 1,059 sqft Built 1950
Raw Value $187,553
Adjusted Value $345,443

Adjusted +$4,726 for 15 sqft more living space and +$153,164 for being newer. Net adjustment: +$157,890.

2 bed 1 bath 1,272 sqft Built 1915
Raw Value $316,886
Adjusted Value $201,483

Adjusted -$62,385 for 198 sqft less living space and -$53,018 for being older. Net adjustment: -$115,403.

2 bed 1 bath 1,238 sqft Built 1955
Raw Value $239,279
Adjusted Value $262,699

Adjusted -$51,673 for 164 sqft less living space and +$182,619 for being newer and -$107,526 for no garage. Net adjustment: +$23,420.

3 bed 1,483 sqft Built 1950
Raw Value $505,642
Adjusted Value $529,939

Adjusted -$128,867 for 409 sqft less living space and +$153,164 for being newer. Net adjustment: +$24,297.

3 bed 1 bath 1,376 sqft Built 1960
Raw Value $321,405
Adjusted Value $330,799

Adjusted -$95,153 for 302 sqft less living space and +$212,073 for being newer and -$107,526 for no garage. Net adjustment: +$9,394.

The Neighborhood

This home is valued 6.7% above the R703T14G - Round Rock Historical median of $404,269. With 59 homes in the subdivision, the property sits in the upper tier. The neighborhood appreciated 33.1% over the past year.

R703T14G - Round Rock Historical

typical
59 Properties
$404,269 Median Value
+33.1% YoY Change
9% Have Pool
14% Have Garage
This Home
$431,184
Median
$404,269

This home is +6.7% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,758 across all districts. With a homestead exemption claimed, that drops to $6,428 — saving $1,330 per year. That's $536 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%$3,851
Round RockCity0.3720%$1,604
Williamson CountyCounty0.3694%$1,593
Austin Community Collegespecial0.1034%$446
Williamson County FM/RdCounty0.0443%$191
Upper Brushy Creek WCIDWater0.0170%$73
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$7,758

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $330,799 would pay approximately $2,065 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