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US ZIP Code Profile

ZIP Code 78640
Kyle, Texas

ZIP code 78640 is in Kyle, located in Hays County, Texas, within the Austin-Round Rock metro area. Its 2020 Census population was 64,539. The estimated median adjusted gross income per tax return is $49,934, and about 3% of filers report $200,000 or more.

2020 Population
64,539
Census ZCTA
County
Hays
FIPS 48209
Median income (est.)
$49,934
IRS SOI 2022
Land Area
91.678 mi²
+ 0.808 mi² water

01Location & Geography

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

Primary CityKyle, TX
CountyHays County (FIPS 48209)
StateTexas (FIPS 48)
Metro Area (MSA)Austin-Round Rock, TX Metro Area (12420)
Census Region / DivisionSouth Region · West South Central Division
Coordinates29.99911, -97.82822
Land / Water Area91.678 mi² land · 0.808 mi² water

02Income & Economics

Distribution of the 35,970 individual tax returns filed in 78640 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
23.8%
$25K–$50K
26.2%
$50K–$75K
18.7%
$75K–$100K
11.6%
$100K–$200K
16.4%
$200K+
3.2%
The $200,000+ bracket accounts for 16% of 78640's total adjusted gross income, from 3% of returns — a concentration that drives the gap between the median ($49,934) 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 78640's IRS income metrics, 2020–2022.

Median income (2021→2022)
$49,934
▲ 8.4%
Filers earning $200K+
3.2%
▲ 0.7 pt
Total filers
35,970
▲ 8.7%
GET /zipc/v2/zipcodes/78640/soi?year=… $43K 2020 $46K 2021 $50K 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 78640 ZCTA.

2000
16,001
 
2010
42,954
▲ +168.4%
2020
64,539
▲ +50.3%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number484820
City AliasesKyle, Niederwald, Uhland

06Frequently Asked Questions

What county is ZIP code 78640 in?

ZIP code 78640 is in Hays County, Texas (county FIPS code 48209).

What city is ZIP code 78640?

The primary USPS city for 78640 is Kyle, TX.

What metro area (MSA) is 78640 in?

78640 is part of the Austin-Round Rock, TX Metro Area (MSA code 12420).

What is the population of ZIP code 78640?

The 2020 Census population of 78640 was 64,539 residents.

What is the median income in ZIP code 78640?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78640 is about $49,934, with around 3% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.