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

3870 MAYFIELD RANCH BLVD, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed2 bath1,726 sqftBuilt 2005

Property at a Glance

This home is estimated between $422,342 and $528,749, with a best estimate of $473,062. That places the property above the R107503F - PRESERVE AT STONE OAK - PH 3 & 4 median of $368,194, in a neighborhood that declined 10.9% over the past year.

Estimated Value Range

$422,342 $528,749
Best Estimate
$473,062
WCAD Value
$357,028
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 $422,342 and $528,749. More comparables in the same subdivision would strengthen this estimate.

Comparable Properties (5)

3810 MAYFIELD RANCH BLVD, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,261 sqft Built 2005
Raw Value $378,400
Adjusted Value $473,062

Adjusted +$94,662 for 465 sqft more living space. Net adjustment: +$94,662.

3890 MAYFIELD RANCH BLVD, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,120 sqft Built 2005
Raw Value $379,035
Adjusted Value $502,400

Adjusted +$123,365 for 606 sqft more living space. Net adjustment: +$123,365.

3880 MAYFIELD RANCH BLVD, ROUND ROCK, TX 78681
0.00 mi 99% similar Same subdivision
3 bed 2 bath 959 sqft Built 2005
Raw Value $372,608
Adjusted Value $528,749

Adjusted +$156,141 for 767 sqft more living space. Net adjustment: +$156,141.

3 bed 2 bath 1,756 sqft Built 2021
Raw Value $410,055
Adjusted Value $426,360

Adjusted -$6,107 for 30 sqft less living space and +$22,412 for being newer. Net adjustment: +$16,305.

3 bed 2 bath 1,791 sqft Built 2021
Raw Value $413,162
Adjusted Value $422,342

Adjusted -$13,232 for 65 sqft less living space and +$22,412 for being newer. Net adjustment: +$9,180.

The Neighborhood

This home is valued 3.0% below the R107503F - PRESERVE AT STONE OAK - PH 3 & 4 median of $368,194. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 10.9% over the past year.

R107503F - PRESERVE AT STONE OAK - PH 3 & 4

typical
1,045 Properties
$368,194 Median Value
-10.9% YoY Change
1% Have Pool
99% Have Garage
This Home
$357,028
Median
$368,194

This home is -3.0% below the subdivision median.

Tax Analysis

The estimated annual property tax is $6,424 across all districts. With a homestead exemption claimed, that drops to $5,108 — saving $1,316 per year. That's $426 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%$3,189
Round RockCity0.3720%$1,328
Williamson CountyCounty0.3694%$1,319
Austin Community Collegespecial0.1034%$369
Williamson County FM/RdCounty0.0443%$158
Upper Brushy Creek WCIDWater0.0170%$61
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$6,424

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $473,062 would pay approximately $2,953 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