ZIP Code 78548 — Grulla, TX
78548 is a standard (street delivery) ZIP code serving Grulla, 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 78548 at a glance
| ZIP code | 78548 |
|---|---|
| Primary city | Grulla |
| State | Texas (TX) |
| County | Starr FIPS 48427 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,341 |
| Coordinates | 26.276540, -98.655270 |
How ZIP+4 works in 78548
The four digits after the hyphen encode a delivery segment inside 78548. 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 78548 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 78548.
| ZIP | City | Distance |
|---|---|---|
| 78547 | Garciasville, TX | 3.4 mi |
| 78565 | Los Ebanos, TX | 6.2 mi |
| 78595 | Sullivan City, TX | 7.6 mi |
| 78560 | La Joya, TX | 10 mi |
| 78576 | Penitas, TX | 12.1 mi |
| 78574 | Mission, TX | 17.6 mi |
| 78582 | Rio Grande City, TX | 18.9 mi |
| 78572 | Mission, TX | 19.3 mi |
| 78573 | Mission, TX | 21.9 mi |
| 78504 | Mcallen, TX | 25.9 mi |
| 78541 | Edinburg, TX | 25.9 mi |
| 78501 | Mcallen, TX | 26.1 mi |
Questions about 78548
What is the ZIP+4 code for 78548?
78548 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 78548, you need to look up a specific street address to get them.
What city is 78548?
78548 is assigned to Grulla, 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.