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

3900 UPPER PASSAGE LN, ROUND ROCK, TX 78681

ROUND ROCK, 78681 — williamson County

3 bed1,548 sqftBuilt 2009

Property at a Glance

This home is estimated between $279,885 and $321,136, with a best estimate of $300,755. That places the property below the R107503F - PRESERVE AT STONE OAK - PH 3 & 4 median of $368,194, in a neighborhood that declined 10.9% over the past year.

Estimated Value Range

$279,885 $321,136
Best Estimate
$300,755
WCAD Value
$27,609
High Confidence

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

Based on 5 comparable properties in R107503F - PRESERVE AT STONE OAK - PH 3 & 4, this home's estimated market value is between $279,885 and $321,136. All 5 comparables are in the same subdivision, giving this estimate high confidence.

Comparable Properties (5)

3943 UPPER PASSAGE LN, ROUND ROCK, TX 78681
0.00 mi 93% similar Same subdivision
3 bed 2 bath 1,544 sqft Built 2000
Raw Value $291,678
Adjusted Value $279,885

Adjusted +$814 for 4 sqft more living space and -$12,607 for being older. Net adjustment: -$11,793.

3916 UPPER PASSAGE LN, ROUND ROCK, TX 78681
0.00 mi 93% similar Same subdivision
3 bed 2 bath 1,682 sqft Built 2006
Raw Value $352,617
Adjusted Value $321,136

Adjusted -$27,279 for 134 sqft less living space and -$4,202 for being older. Net adjustment: -$31,481.

3924 UPPER PASSAGE LN, ROUND ROCK, TX 78681
0.00 mi 93% similar Same subdivision
3 bed 2 bath 1,524 sqft Built 2000
Raw Value $308,476
Adjusted Value $300,755

Adjusted +$4,886 for 24 sqft more living space and -$12,607 for being older. Net adjustment: -$7,721.

3918 UPPER PASSAGE LN, ROUND ROCK, TX 78681
0.00 mi 91% similar Same subdivision
3 bed 2 bath 1,786 sqft Built 2006
Raw Value $373,509
Adjusted Value $320,857

Adjusted -$48,450 for 238 sqft less living space and -$4,202 for being older. Net adjustment: -$52,652.

3942 UPPER PASSAGE LN, ROUND ROCK, TX 78681
0.00 mi 90% similar Same subdivision
3 bed 2 bath 1,682 sqft Built 2000
Raw Value $331,167
Adjusted Value $291,281

Adjusted -$27,279 for 134 sqft less living space and -$12,607 for being older. Net adjustment: -$39,886.

The Neighborhood

This home is valued 92.5% below the R107503F - PRESERVE AT STONE OAK - PH 3 & 4 median of $368,194. That positions it competitively for buyers comparing within the neighborhood. Note that values in this subdivision declined 10.9% over the past year.

R107503F - PRESERVE AT STONE OAK - PH 3 & 4

outlier low
1,045 Properties
$368,194 Median Value
-10.9% YoY Change
1% Have Pool
99% Have Garage
This Home
$27,609
Median
$368,194

This home is -92.5% below the subdivision median.

Tax Analysis

The estimated annual property tax is $497 across all districts. With a homestead exemption claimed, that drops to $232 — saving $265 per year. That's $19 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%$247
Round RockCity0.3720%$103
Williamson CountyCounty0.3694%$102
Austin Community Collegespecial0.1034%$29
Williamson County FM/RdCounty0.0443%$12
Upper Brushy Creek WCIDWater0.0170%$5
Williamson Central Appraisal Districtcad0.0000%$0
Total Annual Tax1.7993%$497

Mortgage Context

At today's 30-year mortgage rate of 6.38%, a buyer financing $300,755 would pay approximately $1,877 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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