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

3939 LORD BYRON CIR, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

4 bed2 bath1,782 sqftBuilt 2001

Property at a Glance

This home is estimated between $240,853 and $606,818, with a best estimate of $475,143. That places the property below the R550600D - Forest Creek Sec 15,16,19,31 median of $514,276, in a neighborhood that declined 8.7% over the past year.

Estimated Value Range

$240,853 $606,818
Best Estimate
$475,143
WCAD Value
$556,413
High Confidence

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

Based on 5 comparable properties in R550600D - Forest Creek Sec 15,16,19,31, this home's estimated market value is between $240,853 and $606,818. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3951 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,679 sqft Built 2001
Raw Value $505,526
Adjusted Value $534,995

Adjusted +$29,469 for 103 sqft more living space. Net adjustment: +$29,469.

4008 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
5 bed 3 bath 2,036 sqft Built 2000
Raw Value $545,849
Adjusted Value $475,143

Adjusted -$72,671 for 254 sqft less living space and +$1,965 for being newer. Net adjustment: -$70,706.

3958 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 2 bath 2,775 sqft Built 2000
Raw Value $522,992
Adjusted Value $240,853

Adjusted -$284,104 for 993 sqft less living space and +$1,965 for being newer. Net adjustment: -$282,139.

3944 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 1,612 sqft Built 2000
Raw Value $556,215
Adjusted Value $606,818

Adjusted +$48,638 for 170 sqft more living space and +$1,965 for being newer. Net adjustment: +$50,603.

3995 LORD BYRON CIR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 2,374 sqft Built 2002
Raw Value $458,723
Adjusted Value $287,383

Adjusted -$169,375 for 592 sqft less living space and -$1,965 for being older. Net adjustment: -$171,340.

The Neighborhood

This home is valued 8.2% above the R550600D - Forest Creek Sec 15,16,19,31 median of $514,276. With 274 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 8.7% over the past year.

R550600D - Forest Creek Sec 15,16,19,31

typical
274 Properties
$514,276 Median Value
-8.7% YoY Change
0% Have Pool
99% Have Garage
This Home
$556,413
Median
$514,276

This home is +8.2% above the subdivision median.

Tax Analysis

The estimated annual property tax is $10,011 across all districts. With a homestead exemption claimed, that drops to $8,658 — saving $1,353 per year. That's $722 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%$4,969
Round RockCity0.3720%$2,070
Williamson CountyCounty0.3694%$2,056
Austin Community Collegespecial0.1034%$575
Williamson County FM/RdCounty0.0443%$247
Upper Brushy Creek WCIDWater0.0170%$95
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$10,011

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $475,143 would pay approximately $2,966 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