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

1909 MULLIGAN DR, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

3 bed2 bath2,287 sqftBuilt 2009

Property at a Glance

This home is estimated between $516,973 and $690,550, with a best estimate of $533,258. That places the property below the R545698D - Forest Creek Sec 8 & 9 median of $579,777, in a neighborhood that declined 6.5% over the past year.

Estimated Value Range

$516,973 $690,550
Best Estimate
$533,258
WCAD Value
$636,563
High Confidence

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

Based on 5 comparable properties in R545698D - Forest Creek Sec 8 & 9, this home's estimated market value is between $516,973 and $690,550. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

1908 MULLIGAN DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 2 bath 2,391 sqft Built 2000
Raw Value $542,495
Adjusted Value $526,897

Adjusted -$31,821 for 104 sqft less living space and +$16,223 for being newer. Net adjustment: -$15,598.

1926 MULLIGAN DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,380 sqft Built 2012
Raw Value $567,122
Adjusted Value $533,258

Adjusted -$28,456 for 93 sqft less living space and -$5,408 for being older. Net adjustment: -$33,864.

1920 MULLIGAN DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,155 sqft Built 2001
Raw Value $559,520
Adjusted Value $614,330

Adjusted +$40,389 for 132 sqft more living space and +$14,421 for being newer. Net adjustment: +$54,810.

1911 MULLIGAN DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
4 bed 3 bath 2,493 sqft Built 2011
Raw Value $583,609
Adjusted Value $516,973

Adjusted -$63,031 for 206 sqft less living space and -$3,605 for being older. Net adjustment: -$66,636.

1918 MULLIGAN DR, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2 bath 1,959 sqft Built 2011
Raw Value $593,796
Adjusted Value $690,550

Adjusted +$100,359 for 328 sqft more living space and -$3,605 for being older. Net adjustment: +$96,754.

The Neighborhood

This home is valued 9.8% above the R545698D - Forest Creek Sec 8 & 9 median of $579,777. With 219 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 6.5% over the past year.

R545698D - Forest Creek Sec 8 & 9

typical
219 Properties
$579,777 Median Value
-6.5% YoY Change
2% Have Pool
97% Have Garage
This Home
$636,563
Median
$579,777

This home is +9.8% above the subdivision median.

Tax Analysis

The estimated annual property tax is $11,454 across all districts. With a homestead exemption claimed, that drops to $10,086 — saving $1,368 per year. That's $841 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%$5,685
Round RockCity0.3720%$2,368
Williamson CountyCounty0.3694%$2,352
Austin Community Collegespecial0.1034%$658
Williamson County FM/RdCounty0.0443%$282
Upper Brushy Creek WCIDWater0.0170%$108
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$11,454

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $533,258 would pay approximately $3,329 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