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

3916 OBSIDIAN LN, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

4 bed3 bath2,174 sqftBuilt 2007

Property at a Glance

This home is estimated between $764,186 and $946,886, with a best estimate of $808,751. That places the property below the R147606C - WALSH RANCH median of $933,667, in a neighborhood that declined 4.6% over the past year.

Estimated Value Range

$764,186 $946,886
Best Estimate
$808,751
WCAD Value
$863,819
Low Confidence

Based on 5 comparable properties(1 in the same subdivision)

There are 5 comparable properties within range, but few are in R147606C - WALSH RANCH. The estimated range of $764,186 and $946,886 should be treated as a rough guide.

Comparable Properties (5)

3323 MARCASITE DR, ROUND ROCK, TX 78681
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,219 sqft Built 2007
Raw Value $904,649
Adjusted Value $886,351

Adjusted -$18,298 for 45 sqft less living space. Net adjustment: -$18,298.

4 bed 3 bath 2,154 sqft Built 2001
Raw Value $860,722
Adjusted Value $785,484

Adjusted +$8,133 for 20 sqft more living space and -$83,371 for being older. Net adjustment: -$75,238.

4 bed 3 bath 1,916 sqft Built 2014
Raw Value $562,011
Adjusted Value $764,186

Adjusted +$104,909 for 258 sqft more living space and +$97,266 for being newer. Net adjustment: +$202,175.

4 bed 3 bath 1,916 sqft Built 2016
Raw Value $578,786
Adjusted Value $808,751

Adjusted +$104,909 for 258 sqft more living space and +$125,056 for being newer. Net adjustment: +$229,965.

4 bed 3 bath 1,811 sqft Built 2014
Raw Value $702,015
Adjusted Value $946,886

Adjusted +$147,605 for 363 sqft more living space and +$97,266 for being newer. Net adjustment: +$244,871.

The Neighborhood

This home is valued 7.5% below the R147606C - WALSH RANCH median of $933,667. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 4.6% over the past year.

R147606C - WALSH RANCH

typical
239 Properties
$933,667 Median Value
-4.6% YoY Change
0% Have Pool
100% Have Garage
This Home
$863,819
Median
$933,667

This home is -7.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $16,177 across all districts. With a homestead exemption claimed, that drops to $14,767 — saving $1,410 per year. That's $1,231 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%$7,715
Williamson CountyCounty0.3694%$3,191
Walsh Ranch MUDMUD0.3455%$2,984
Austin Community Collegespecial0.1034%$893
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$864
Williamson County FM/RdCounty0.0443%$383
Upper Brushy Creek WCIDWater0.0170%$147
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.8728%$16,177

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $808,751 would pay approximately $5,048 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