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

12909 MARIMBA TRL, AUSTIN, TX 78729

AUSTIN, 78729 — williamson County

3 bed2 bath516 sqftBuilt 1991

Property at a Glance

This home is estimated between $282,110 and $354,679, with a best estimate of $309,476. That places the property below the R390485G - Milwood Sec 28 & 29 median of $335,104, in a neighborhood that declined 8.3% over the past year.

Estimated Value Range

$282,110 $354,679
Best Estimate
$309,476
WCAD Value
$409,751
High Confidence

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

Based on 5 comparable properties in R390485G - Milwood Sec 28 & 29, this home's estimated market value is between $282,110 and $354,679. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

12911 MARIMBA TRL, AUSTIN, TX 78729
0.01 mi 100% similar Same subdivision
3 bed 2 bath 670 sqft Built 1989
Raw Value $381,108
Adjusted Value $326,819

Adjusted -$74,178 for 154 sqft less living space and +$19,889 for being newer. Net adjustment: -$54,289.

12907 MARIMBA TRL, AUSTIN, TX 78729
0.01 mi 100% similar Same subdivision
3 bed 2 bath 740 sqft Built 1991
Raw Value $390,006
Adjusted Value $282,110

Adjusted -$107,896 for 224 sqft less living space. Net adjustment: -$107,896.

12913 MARIMBA TRL, AUSTIN, TX 78729
0.02 mi 100% similar Same subdivision
3 bed 2 bath 740 sqft Built 1991
Raw Value $398,772
Adjusted Value $290,876

Adjusted -$107,896 for 224 sqft less living space. Net adjustment: -$107,896.

12905 MARIMBA TRL, AUSTIN, TX 78729
0.02 mi 100% similar Same subdivision
3 bed 2 bath 516 sqft Built 1991
Raw Value $354,679
Adjusted Value $354,679

This comparable closely matches the subject property's features.

12915 MARIMBA TRL, AUSTIN, TX 78729
0.02 mi 100% similar Same subdivision
3 bed 2 bath 570 sqft Built 1990
Raw Value $325,542
Adjusted Value $309,476

Adjusted -$26,011 for 54 sqft less living space and +$9,945 for being newer. Net adjustment: -$16,066.

The Neighborhood

This home is valued 22.3% above the R390485G - Milwood Sec 28 & 29 median of $335,104. With 358 homes in the subdivision, the property sits in the upper tier. Note that values in this subdivision declined 8.3% over the past year.

R390485G - Milwood Sec 28 & 29

above average
358 Properties
$335,104 Median Value
-8.3% YoY Change
0% Have Pool
97% Have Garage
This Home
$409,751
Median
$335,104

This home is +22.3% above the subdivision median.

Tax Analysis

The estimated annual property tax is $7,145 across all districts. With a homestead exemption claimed, that drops to $5,819 — saving $1,326 per year. That's $485 per month a buyer should budget. The assessed value increased +7.7% vs the subdivision average of -8.3%. This above-average increase gives a protest opportunity score of 65 out of 100 — it may be worth challenging the appraisal.

Tax Districts

DistrictTypeRateAnnual Amount
Round Rock ISDSchool0.8931%$3,659
Williamson CountyCounty0.3694%$1,514
North Austin MUD #1MUD0.2165%$887
Austin Community Collegespecial0.1034%$424
Williamson County ESD #1 - Jollyville VFDESD0.1000%$410
Williamson County FM/RdCounty0.0443%$182
Upper Brushy Creek WCIDWater0.0170%$70
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7438%$7,145
65 / 100

Moderate opportunity to protest.

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $309,476 would pay approximately $1,932 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