Zip Code 78594 — Sebastian, TX
78594 is a ZIP Code associated with Sebastian, TX, located within Willacy. 78594 ranks #4 out of 6 ZIP codes in Willacy County by population (and #1412 out of 1,990 in TX). The area supports an estimated population of 1,206 residents across Data Pending housing units, with a population density of 146.9 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (26.347040, -97.803700)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 78594 |
| Primary City | Sebastian |
| State / Province | TX |
| County | Willacy |
| Total Population | 1,206 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 146.9 people/sq mi |
| Timezone | America/Chicago |
How 78594 Compares
| Metric | ZIP 78594 | Willacy County | TX State Average |
|---|
| Population | 1,206 | 20,642 (Total) | 30,188,035 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 146.9 /sq mi | -- | -- |
| County Pop Rank | #4 of 6 | -- | -- |
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 →