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US ZIP Code Profile

ZIP Code 78578
Port Isabel, Texas

ZIP code 78578 is in Port Isabel, located in Cameron County, Texas, within the Brownsville-Harlingen metro area. Its 2020 Census population was 10,076. The estimated median adjusted gross income per tax return is $33,407, and about 4% of filers report $200,000 or more.

2020 Population
10,076
Census ZCTA
County
Cameron
FIPS 48061
Median income (est.)
$33,407
IRS SOI 2022
Land Area
59.889 mi²
+ 25.61 mi² water

01Location & Geography

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

Primary CityPort Isabel, TX
CountyCameron County (FIPS 48061)
StateTexas (FIPS 48)
Metro Area (MSA)Brownsville-Harlingen, TX Metro Area (15180)
Census Region / DivisionSouth Region · West South Central Division
Coordinates26.03552, -97.30273
Land / Water Area59.889 mi² land · 25.61 mi² water

02Income & Economics

Distribution of the 4,520 individual tax returns filed in 78578 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
41.6%
$25K–$50K
25.0%
$50K–$75K
11.9%
$75K–$100K
6.4%
$100K–$200K
10.8%
$200K+
4.2%
The $200,000+ bracket accounts for 35% of 78578's total adjusted gross income, from 4% of returns — a concentration that drives the gap between the median ($33,407) 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 78578's IRS income metrics, 2020–2022.

Median income (2021→2022)
$33,407
▲ 3.2%
Filers earning $200K+
4.2%
▲ 0.0 pt
Total filers
4,520
▲ 0.0%
GET /zipc/v2/zipcodes/78578/soi?year=… $29K 2020 $32K 2021 $33K 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 78578 ZCTA.

2000
9,952
 
2010
12,516
▲ +25.8%
2020
10,076
▼ -19.5%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number487210
City AliasesBahia Mar, Isabel, Laguna Heights, Laguna Vista, Port Isabel, Pt Isabel, Laguna Hts

06Frequently Asked Questions

What county is ZIP code 78578 in?

ZIP code 78578 is in Cameron County, Texas (county FIPS code 48061).

What city is ZIP code 78578?

The primary USPS city for 78578 is Port Isabel, TX.

What metro area (MSA) is 78578 in?

78578 is part of the Brownsville-Harlingen, TX Metro Area (MSA code 15180).

What is the population of ZIP code 78578?

The 2020 Census population of 78578 was 10,076 residents.

What is the median income in ZIP code 78578?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78578 is about $33,407, 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.