ZIP Code 78516 — Alamo, TX
78516 is a standard (street delivery) ZIP code serving Alamo, 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 78516 at a glance
| ZIP code | 78516 |
|---|---|
| Primary city | Alamo |
| State | Texas (TX) |
| County | Hidalgo FIPS 48215 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 34,370 |
| Coordinates | 26.142560, -98.119770 |
How ZIP+4 works in 78516
The four digits after the hyphen encode a delivery segment inside 78516. 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 78516 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 78516.
| ZIP | City | Distance |
|---|---|---|
| 78589 | San Juan, TX | 2.6 mi |
| 78537 | Donna, TX | 4.4 mi |
| 78577 | Pharr, TX | 4.7 mi |
| 78596 | Weslaco, TX | 7.9 mi |
| 78503 | Mcallen, TX | 8.3 mi |
| 78557 | Hidalgo, TX | 8.5 mi |
| 78501 | Mcallen, TX | 9 mi |
| 78599 | Weslaco, TX | 9.5 mi |
| 78539 | Edinburg, TX | 10.3 mi |
| 78579 | Progreso, TX | 11.4 mi |
| 78504 | Mcallen, TX | 11.8 mi |
| 78558 | La Blanca, TX | 12 mi |
Questions about 78516
What is the ZIP+4 code for 78516?
78516 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 78516, you need to look up a specific street address to get them.
What city is 78516?
78516 is assigned to Alamo, 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.