Zip Code 78578 — Port Isabel, TX
78578 is a ZIP Code associated with Port Isabel, TX, located within Cameron. 78578 ranks #9 out of 16 ZIP codes in Cameron County by population (and #821 out of 1,990 in TX). The area supports an estimated population of 10,016 residents across Data Pending housing units, with a population density of 67.9 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (26.053360, -97.310040)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 78578 |
| Primary City | Port Isabel |
| State / Province | TX |
| County | Cameron |
| Total Population | 10,016 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 67.9 people/sq mi |
| Timezone | America/Chicago |
How 78578 Compares
| Metric | ZIP 78578 | Cameron County | TX State Average |
|---|
| Population | 10,016 | 425,684 (Total) | 30,188,035 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 67.9 /sq mi | -- | -- |
| County Pop Rank | #9 of 16 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →