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

4221 CR 123, ROUND ROCK, TX 78664

ROUND ROCK, 78664 — williamson County

3 bed2 bath1,750 sqftBuilt 2007

Property at a Glance

This home is estimated between $375,363 and $553,399, with a best estimate of $409,719. That places the property below the H005D86H - Hutto Abstracts median of $644,778, in a neighborhood that appreciated 25.9% over the past year.

Estimated Value Range

$375,363 $553,399
Best Estimate
$409,719
WCAD Value
$741,463
Low Confidence

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

There are 5 comparable properties within range, but few are in H005D86H - Hutto Abstracts. The estimated range of $375,363 and $553,399 should be treated as a rough guide.

Comparable Properties (5)

4356 CR 123, ROUND ROCK, TX 78664
0.00 mi 100% similar Same subdivision
3 bed 2,159 sqft Built 2021
Raw Value $585,415
Adjusted Value $419,383

Adjusted -$129,071 for 409 sqft less living space and -$36,961 for being older. Net adjustment: -$166,032.

3 bed 2 bath 1,526 sqft Built 2002
Raw Value $291,474
Adjusted Value $375,363

Adjusted +$70,689 for 224 sqft more living space and +$13,200 for being newer. Net adjustment: +$83,889.

4 bed 2 bath 1,704 sqft Built 2012
Raw Value $552,082
Adjusted Value $553,399

Adjusted +$14,517 for 46 sqft more living space and -$13,200 for being older. Net adjustment: +$1,317.

3 bed 2 bath 1,494 sqft Built 2002
Raw Value $289,342
Adjusted Value $383,330

Adjusted +$80,788 for 256 sqft more living space and +$13,200 for being newer. Net adjustment: +$93,988.

3 bed 2 bath 1,459 sqft Built 2000
Raw Value $299,405
Adjusted Value $409,719

Adjusted +$91,833 for 291 sqft more living space and +$18,481 for being newer. Net adjustment: +$110,314.

The Neighborhood

This home is valued 15.0% above the H005D86H - Hutto Abstracts median of $644,778. With 1,074 homes in the subdivision, the property sits in the upper tier. The neighborhood appreciated 25.9% over the past year.

H005D86H - Hutto Abstracts

typical
1,074 Properties
$644,778 Median Value
+25.9% YoY Change
3% Have Pool
35% Have Garage
This Home
$741,463
Median
$644,778

This home is +15.0% above the subdivision median.

Tax Analysis

The estimated annual property tax is $13,007 across all districts. With a homestead exemption claimed, that drops to $11,184 — saving $1,823 per year. That's $932 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
Hutto ISDSchool1.2052%$8,823
Williamson CountyCounty0.3694%$2,704
Williamson County ESD #9 - Round RockESD0.0999%$731
Williamson County FM/RdCounty0.0443%$325
EWC Higher Ed Centerspecial0.0409%$299
Upper Brushy Creek WCIDWater0.0170%$124
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7768%$13,007

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $409,719 would pay approximately $2,557 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