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US ZIP Code Profile

ZIP Code 78738
Austin, Texas

ZIP code 78738 is in Austin, located in Travis County, Texas, within the Austin-Round Rock metro area. Its 2020 Census population was 29,529. The estimated median adjusted gross income per tax return is $166,154, and about 44% of filers report $200,000 or more.

2020 Population
29,529
Census ZCTA
County
Travis
FIPS 48453
Median income (est.)
$166,154
IRS SOI 2022
Land Area
16.994 mi²
+ 0.11 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityAustin, TX
CountyTravis County (FIPS 48453)
StateTexas (FIPS 48)
Metro Area (MSA)Austin-Round Rock, TX Metro Area (12420)
Census Region / DivisionSouth Region · West South Central Division
Coordinates30.320116, -97.95818
Land / Water Area16.994 mi² land · 0.11 mi² water

02Income & Economics

Distribution of the 14,020 individual tax returns filed in 78738 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
15.3%
$25K–$50K
9.1%
$50K–$75K
7.4%
$75K–$100K
6.0%
$100K–$200K
18.5%
$200K+
43.7%
The $200,000+ bracket accounts for 88% of 78738's total adjusted gross income, from 44% of returns — a concentration that drives the gap between the median ($166,154) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 78738's IRS income metrics, 2020–2022.

Median income (2021→2022)
$166,154
▲ 0.6%
Filers earning $200K+
43.7%
▲ 0.3 pt
Total filers
14,020
▲ 4.3%
GET /zipc/v2/zipcodes/78738/soi?year=… $141K 2020 $165K 2021 $166K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 78738 ZCTA.

2000
2,840
 
2010
12,134
▲ +327.3%
2020
29,529
▲ +143.4%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number480420
City AliasesAustin, Bee Cave, Bee Caves, The Hills, Village Of The Hills, Vlg O The Hls, Lakeway

06Frequently Asked Questions

What county is ZIP code 78738 in?

ZIP code 78738 is in Travis County, Texas (county FIPS code 48453).

What city is ZIP code 78738?

The primary USPS city for 78738 is Austin, TX.

What metro area (MSA) is 78738 in?

78738 is part of the Austin-Round Rock, TX Metro Area (MSA code 12420).

What is the population of ZIP code 78738?

The 2020 Census population of 78738 was 29,529 residents.

What is the median income in ZIP code 78738?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78738 is about $166,154, with around 44% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.