ZIP Code 78557 — Hidalgo, TX
78557 is a standard (street delivery) ZIP code serving Hidalgo, Texas, in Hidalgo 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 78557 at a glance
| ZIP code | 78557 |
|---|---|
| Primary city | Hidalgo |
| State | Texas (TX) |
| County | Hidalgo FIPS 48215 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 14,498 |
| Coordinates | 26.108440, -98.251180 |
How ZIP+4 works in 78557
The four digits after the hyphen encode a delivery segment inside 78557. 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 78557 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 78557.
| ZIP | City | Distance |
|---|---|---|
| 78503 | Mcallen, TX | 3.7 mi |
| 78577 | Pharr, TX | 5.5 mi |
| 78589 | San Juan, TX | 6.5 mi |
| 78501 | Mcallen, TX | 7.5 mi |
| 78516 | Alamo, TX | 8.5 mi |
| 78572 | Mission, TX | 9 mi |
| 78504 | Mcallen, TX | 11.7 mi |
| 78539 | Edinburg, TX | 12.6 mi |
| 78537 | Donna, TX | 12.8 mi |
| 78573 | Mission, TX | 13.4 mi |
| 78596 | Weslaco, TX | 15.7 mi |
| 78574 | Mission, TX | 15.9 mi |
Questions about 78557
What is the ZIP+4 code for 78557?
78557 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 78557, you need to look up a specific street address to get them.
What city is 78557?
78557 is assigned to Hidalgo, Texas, in Hidalgo 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.