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

15515 N RR 620, AUSTIN, TX 78717

AUSTIN, 78717 — williamson County

3 bed6,088 sqftBuilt 1960

Property at a Glance

This home is estimated between $1,036,006 and $1,944,999, with a best estimate of $1,647,878.

Estimated Value Range

$1,036,006 $1,944,999
Best Estimate
$1,647,878
WCAD Value
$1,559,824
Low Confidence

Based on 5 comparable properties(0 in the same subdivision)

There are 5 comparable properties within range, but none are in R30ER - Restaurant-west Round Rock. The estimated range of $1,036,006 and $1,944,999 should be treated as a rough guide.

Comparable Properties (5)

3 bed 9,386 sqft Built 1983
Raw Value $1,890,190
Adjusted Value $1,036,006

Adjusted -$796,317 for 3,298 sqft less living space and +$2,326 for being newer and -$60,193 for no garage. Net adjustment: -$854,184.

RR 620, AUSTIN, TX 78717
0.00 mi 72% similar
3 bed 2,811 sqft Built 1955
Raw Value $1,154,258
Adjusted Value $1,944,999

Adjusted +$791,247 for 3,277 sqft more living space and -$506 for being older. Net adjustment: +$790,741.

3 bed 3,738 sqft Built 1979
Raw Value $1,138,731
Adjusted Value $1,647,878

Adjusted +$567,418 for 2,350 sqft more living space and +$1,922 for being newer and -$60,193 for no garage. Net adjustment: +$509,147.

3 bed 2,935 sqft Built 1965
Raw Value $979,418
Adjusted Value $1,741,230

Adjusted +$761,306 for 3,153 sqft more living space and +$506 for being newer. Net adjustment: +$761,812.

15615 RM 620, AUSTIN, TX 78717
0.00 mi 67% similar
3 bed 2 bath 3,280 sqft Built 1964
Raw Value $534,515
Adjusted Value $1,212,925

Adjusted +$678,005 for 2,808 sqft more living space and +$405 for being newer. Net adjustment: +$678,410.

The Neighborhood

Subdivision comparison data is not available for this property.

Tax Analysis

The estimated annual property tax is $23,823 across all districts. With a homestead exemption claimed, that drops to $22,284 — saving $1,539 per year. That's $1,857 per month a buyer should budget. The assessed value increased +4.6%. This 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%$13,931
Williamson CountyCounty0.3694%$5,763
Austin Community Collegespecial0.1034%$1,613
Williamson County ESD #2 - Sam Bass VFDESD0.1000%$1,560
Williamson County FM/RdCounty0.0443%$691
Upper Brushy Creek WCIDWater0.0170%$265
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.5273%$23,823
65 / 100

Moderate opportunity to protest.

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $1,647,878 would pay approximately $10,286 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.

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