ZIP Code 78591 — Santa Elena, TX
78591 is a standard (street delivery) ZIP code serving Santa Elena, Texas, in Starr County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 78591 at a glance
| ZIP code | 78591 |
|---|---|
| Primary city | Santa Elena |
| State | Texas (TX) |
| County | Starr FIPS 48427 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 158 |
| Coordinates | 26.653510, -98.534080 |
How ZIP+4 works in 78591
The four digits after the hyphen encode a delivery segment inside 78591. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 78591 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 78591.
| ZIP | City | Distance |
|---|---|---|
| 78536 | Delmita, TX | 5.6 mi |
| 78588 | San Isidro, TX | 10.3 mi |
| 78582 | Rio Grande City, TX | 14.9 mi |
| 78563 | Linn, TX | 17.4 mi |
| 78541 | Edinburg, TX | 20.6 mi |
| 78576 | Penitas, TX | 23 mi |
| 78360 | Guerra, TX | 23.3 mi |
| 78595 | Sullivan City, TX | 23.4 mi |
| 78353 | Encino, TX | 24.3 mi |
| 78574 | Mission, TX | 25.6 mi |
| 78547 | Garciasville, TX | 25.8 mi |
| 78548 | Grulla, TX | 27.1 mi |
Questions about 78591
What is the ZIP+4 code for 78591?
78591 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 78591, you need to look up a specific street address to get them.
What city is 78591?
78591 is assigned to Santa Elena, Texas, in Starr County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.