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US ZIP Code Profile

ZIP Code 77360
Onalaska, Texas

ZIP code 77360 is in Onalaska, located in Polk County, Texas. Its 2020 Census population was 5,603. The estimated median adjusted gross income per tax return is $38,958, and about 4% of filers report $200,000 or more.

2020 Population
5,603
Census ZCTA
County
Polk
FIPS 48373
Median income (est.)
$38,958
IRS SOI 2022
Land Area
32.882 mi²
+ 14.126 mi² water

01Location & Geography

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

Primary CityOnalaska, TX
CountyPolk County (FIPS 48373)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates30.846249, -95.117516
Land / Water Area32.882 mi² land · 14.126 mi² water

02Income & Economics

Distribution of the 2,450 individual tax returns filed in 77360 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
36.3%
$25K–$50K
24.5%
$50K–$75K
13.9%
$75K–$100K
9.0%
$100K–$200K
12.7%
$200K+
3.7%
The $200,000+ bracket accounts for 22% of 77360's total adjusted gross income, from 4% of returns — a concentration that drives the gap between the median ($38,958) 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 77360's IRS income metrics, 2020–2022.

Median income (2021→2022)
$38,958
▲ 9.6%
Filers earning $200K+
3.7%
▲ 0.4 pt
Total filers
2,450
▲ 1.7%
GET /zipc/v2/zipcodes/77360/soi?year=… $33K 2020 $36K 2021 $39K 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 77360 ZCTA.

2000
4,010
 
2010
5,280
▲ +31.7%
2020
5,603
▲ +6.1%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number486635
City AliasesOnalaska

06Frequently Asked Questions

What county is ZIP code 77360 in?

ZIP code 77360 is in Polk County, Texas (county FIPS code 48373).

What city is ZIP code 77360?

The primary USPS city for 77360 is Onalaska, TX.

What is the population of ZIP code 77360?

The 2020 Census population of 77360 was 5,603 residents.

What is the median income in ZIP code 77360?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 77360 is about $38,958, with around 4% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.