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US ZIP Code Profile

ZIP Code 78628
Georgetown, Texas

ZIP code 78628 is in Georgetown, located in Williamson County, Texas, within the Austin-Round Rock metro area. Its 2020 Census population was 40,378. The estimated median adjusted gross income per tax return is $92,944, and about 21% of filers report $200,000 or more.

2020 Population
40,378
Census ZCTA
County
Williamson
FIPS 48491
Median income (est.)
$92,944
IRS SOI 2022
Land Area
73.34 mi²
+ 1.276 mi² water

01Location & Geography

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

Primary CityGeorgetown, TX
CountyWilliamson County (FIPS 48491)
StateTexas (FIPS 48)
Metro Area (MSA)Austin-Round Rock, TX Metro Area (12420)
Census Region / DivisionSouth Region · West South Central Division
Coordinates30.664543, -97.77862
Land / Water Area73.34 mi² land · 1.276 mi² water

02Income & Economics

Distribution of the 23,870 individual tax returns filed in 78628 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
17.1%
$25K–$50K
14.6%
$50K–$75K
11.5%
$75K–$100K
9.4%
$100K–$200K
26.4%
$200K+
20.9%
The $200,000+ bracket accounts for 62% of 78628's total adjusted gross income, from 21% of returns — a concentration that drives the gap between the median ($92,944) 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 78628's IRS income metrics, 2020–2022.

Median income (2021→2022)
$92,944
▲ 7.2%
Filers earning $200K+
20.9%
▲ 2.0 pt
Total filers
23,870
▲ 7.7%
GET /zipc/v2/zipcodes/78628/soi?year=… $75K 2020 $87K 2021 $93K 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 78628 ZCTA.

2000
25,859
 
2010
23,727
▼ -8.2%
2020
40,378
▲ +70.2%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number483475
City AliasesGeorgetown, Sun City, Andice

06Frequently Asked Questions

What county is ZIP code 78628 in?

ZIP code 78628 is in Williamson County, Texas (county FIPS code 48491).

What city is ZIP code 78628?

The primary USPS city for 78628 is Georgetown, TX.

What metro area (MSA) is 78628 in?

78628 is part of the Austin-Round Rock, TX Metro Area (MSA code 12420).

What is the population of ZIP code 78628?

The 2020 Census population of 78628 was 40,378 residents.

What is the median income in ZIP code 78628?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78628 is about $92,944, with around 21% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.