Residential delivery area · Texas
ZIP Code 78578: Port Isabel, TX
ZIP code 78578 uses the postal name Port Isabel, Texas and lies entirely in Cameron County (Census 2020 ZIP-county file). About 10,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $51,880 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Brownsville (32%), Port Isabel (12%), Laguna Vista (9%) and Laguna Heights (under 1%); 48% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Port Isabel · its only residential ZIP
- County
- Cameron County
- Census places
- Brownsville (32%); Port Isabel (12%); Laguna Vista (9%); Laguna Heights (under 1%) census-designated place
- Metro area
- Brownsville-Harlingen, TX
- House district
- TX-34 119th Congress
- State
- Texas
- Time zone
- Central
- Land area
- 57.0 sq mi · 176 people per sq mi
Where is ZIP code 78578?
78578 centers on 26.044°, -97.307° and covers 57.0 square miles of land plus 22.0 of water. It borders 3 ZIP codes: 78521, 78566, 78526.
The map draws ZIP code areas only. For the streets inside 78578, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 78578 compare with the rest of Cameron County?
| Measure | 78578 | In Cameron County | In TX |
|---|---|---|---|
| People (ACS 2020-2024) | 10,016 | 9th of 17 | 821st of 1,990 |
| Median household income | $52k | not ranked | not ranked |
| Median home value | $196k | 3rd of 12 | 763rd of 1,172 |
78578's median household income is not ranked: its 90% margin of error (±$16,789) is more than a quarter of the figure ($51,880). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 61% of U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 78578?
The 2020 Census counted 10,076 people in 78578; the ACS, which samples households over 2020-2024, estimates 10,016. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 10,016
- 2020 Census count
- 10,076
- Households
- 4,379
- Median age
- 49.0
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 78578?
Of the 10,016 people the ACS estimates in 78578, 20.1% are under 18 and 27.2% are 65 or older. The largest group by race and Hispanic origin is Hispanic or Latino (57.3%), then White (not Hispanic) (40.0%).
- Under 1820.1%
- 18 to 6452.7%
- 65 and older27.2%
- Hispanic or Latino57.3%
- White, not Hispanic40.0%
- Other or two or more2.1%
- Asian, not Hispanic0.5%
- Black, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 78578 earn?
Median household income is $51,880 (ACS 2020-2024).
- Median household income
- $51,880±$16,789
- Income per person
- $37,249
- Below the poverty line
- 27.0%
- Unemployed (of the labor force)
- 3.6%
- Adults 25+ with a bachelor's degree
- 28.6%
- Adjusted gross income per tax return, 2022
- $64,2874,520 returns; wages 55% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 78578?
FHFA's house price index for 78578, built from repeat sales and appraisals of the same homes, rose 102% from 2015 to 2025 and rose 64% from 2020 to 2025, and moved −1.0% in 2025.
- Median home value (owners' estimate)
- $196,200
- Median gross rent
- $749
- Homes owned by their occupants
- 74.6%
- Housing units
- 6,480
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 78578?
211 business establishments had a location in this ZIP code in 2023, 21 fewer than in 2018; the most are in accommodation and food services (ZIP Code Business Patterns).
- Accommodation and food services40
- Retail trade32
- Agriculture, forestry, fishing and hunting22
- Other services (except public administration)16
- Health care and social assistance15
- Professional, scientific, and technical services13
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 78578?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 78521 | Brownsville | 87,380 | $45k | 6.9 mi |
| 78566 | Los Fresnos | 25,110 | $60k | 8.2 mi |
| 78526 | Brownsville | 60,012 | $71k | 9.6 mi |
| 78575 | Olmito | 4,575 | $72k | 15.1 mi (near) |
| 78597 | South Padre Island | 2,935 | $68k | 16.0 mi (near) |
| 78520 | Brownsville | 64,740 | $50k | 16.1 mi (near) |
| 78583 | Rio Hondo | 5,236 | $52k | 19.6 mi (near) |
| 78586 | San Benito | 50,964 | $46k | 21.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.