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

3430 SANDY KOUFAX LN, ROUND ROCK, TX 78665

ROUND ROCK, 78665 — williamson County

3 bed2 bath1,088 sqftBuilt 2002

Property at a Glance

This home is estimated between $187,457 and $362,267, with a best estimate of $342,752. That places the property above the R454400F - Ryan's Crossing Sec 1 Thru 6 median of $339,919, in a neighborhood that declined 9.3% over the past year.

Estimated Value Range

$187,457 $362,267
Best Estimate
$342,752
WCAD Value
$338,204
High Confidence

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

Based on 5 comparable properties in R454400F - Ryan's Crossing Sec 1 Thru 6, this home's estimated market value is between $187,457 and $362,267. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3428 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,020 sqft Built 2003
Raw Value $348,644
Adjusted Value $362,267

Adjusted +$12,671 for 68 sqft more living space and +$952 for being newer. Net adjustment: +$13,623.

3625 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,816 sqft Built 2003
Raw Value $326,655
Adjusted Value $191,948

Adjusted -$135,659 for 728 sqft less living space and +$952 for being newer. Net adjustment: -$134,707.

3410 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,059 sqft Built 2002
Raw Value $353,039
Adjusted Value $358,443

Adjusted +$5,404 for 29 sqft more living space. Net adjustment: +$5,404.

3417 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,097 sqft Built 2003
Raw Value $343,477
Adjusted Value $342,752

Adjusted -$1,677 for 9 sqft less living space and +$952 for being newer. Net adjustment: -$725.

3611 SANDY KOUFAX LN, ROUND ROCK, TX 78665
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,858 sqft Built 2003
Raw Value $329,990
Adjusted Value $187,457

Adjusted -$143,485 for 770 sqft less living space and +$952 for being newer. Net adjustment: -$142,533.

The Neighborhood

This home is in line with the R454400F - Ryan's Crossing Sec 1 Thru 6 median of $339,919. Note that values in this subdivision declined 9.3% over the past year.

R454400F - Ryan's Crossing Sec 1 Thru 6

typical
567 Properties
$339,919 Median Value
-9.3% YoY Change
1% Have Pool
100% Have Garage
This Home
$338,204
Median
$339,919

This home is -0.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $6,085 across all districts. With a homestead exemption claimed, that drops to $4,772 — saving $1,313 per year. That's $398 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%$3,020
Round RockCity0.3720%$1,258
Williamson CountyCounty0.3694%$1,249
Austin Community Collegespecial0.1034%$350
Williamson County FM/RdCounty0.0443%$150
Upper Brushy Creek WCIDWater0.0170%$57
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$6,085

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $342,752 would pay approximately $2,139 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