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US ZIP Code Profile

ZIP Code 78633
Georgetown, Texas

ZIP code 78633 is in Georgetown, located in Williamson County, Texas, within the Austin-Round Rock metro area. Its 2020 Census population was 27,736. The estimated median adjusted gross income per tax return is $90,625, and about 16% of filers report $200,000 or more.

2020 Population
27,736
Census ZCTA
County
Williamson
FIPS 48491
Median income (est.)
$90,625
IRS SOI 2022
Land Area
82.26 mi²
+ 1.272 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
Coordinates30.741182, -97.7561
Land / Water Area82.26 mi² land · 1.272 mi² water

02Income & Economics

Distribution of the 16,860 individual tax returns filed in 78633 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
15.8%
$25K–$50K
13.9%
$50K–$75K
13.2%
$75K–$100K
11.4%
$100K–$200K
29.3%
$200K+
16.4%
The $200,000+ bracket accounts for 53% of 78633's total adjusted gross income, from 16% of returns — a concentration that drives the gap between the median ($90,625) 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 78633's IRS income metrics, 2020–2022.

Median income (2021→2022)
$90,625
▼ 1.0%
Filers earning $200K+
16.4%
▼ 0.5 pt
Total filers
16,860
▲ 5.6%
GET /zipc/v2/zipcodes/78633/soi?year=… $79K 2020 $92K 2021 $91K 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 78633 ZCTA.

2010
19,349
 
2020
27,736
▲ +43.3%

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

06Frequently Asked Questions

What county is ZIP code 78633 in?

ZIP code 78633 is in Williamson County, Texas (county FIPS code 48491).

What city is ZIP code 78633?

The primary USPS city for 78633 is Georgetown, TX.

What metro area (MSA) is 78633 in?

78633 is part of the Austin-Round Rock, TX Metro Area (MSA code 12420).

What is the population of ZIP code 78633?

The 2020 Census population of 78633 was 27,736 residents.

What is the median income in ZIP code 78633?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78633 is about $90,625, with around 16% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.