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US ZIP Code Profile

ZIP Code 78734
Austin, Texas

ZIP code 78734 is in Austin, located in Travis County, Texas, within the Austin-Round Rock metro area. Its 2020 Census population was 22,963. The estimated median adjusted gross income per tax return is $93,750, and about 26% of filers report $200,000 or more.

2020 Population
22,963
Census ZCTA
County
Travis
FIPS 48453
Median income (est.)
$93,750
IRS SOI 2022
Land Area
20.125 mi²
+ 4.184 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
Coordinates30.378546, -97.95063
Land / Water Area20.125 mi² land · 4.184 mi² water

02Income & Economics

Distribution of the 11,150 individual tax returns filed in 78734 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
19.2%
$25K–$50K
13.6%
$50K–$75K
10.8%
$75K–$100K
8.4%
$100K–$200K
22.3%
$200K+
25.6%
The $200,000+ bracket accounts for 78% of 78734's total adjusted gross income, from 26% of returns — a concentration that drives the gap between the median ($93,750) 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 78734's IRS income metrics, 2020–2022.

Median income (2021→2022)
$93,750
▲ 4.9%
Filers earning $200K+
25.6%
▲ 0.4 pt
Total filers
11,150
▲ 0.5%
GET /zipc/v2/zipcodes/78734/soi?year=… $76K 2020 $89K 2021 $94K 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 78734 ZCTA.

2000
12,925
 
2010
17,655
▲ +36.6%
2020
22,963
▲ +30.1%

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, Hudson Bend, Lakeway

06Frequently Asked Questions

What county is ZIP code 78734 in?

ZIP code 78734 is in Travis County, Texas (county FIPS code 48453).

What city is ZIP code 78734?

The primary USPS city for 78734 is Austin, TX.

What metro area (MSA) is 78734 in?

78734 is part of the Austin-Round Rock, TX Metro Area (MSA code 12420).

What is the population of ZIP code 78734?

The 2020 Census population of 78734 was 22,963 residents.

What is the median income in ZIP code 78734?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78734 is about $93,750, with around 26% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.