ZIP Code 78338 — Armstrong, TX
78338 is a standard (street delivery) ZIP code serving Armstrong, Texas, in Kenedy 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 78338 at a glance
| ZIP code | 78338 |
|---|---|
| Primary city | Armstrong |
| State | Texas (TX) |
| County | Kenedy FIPS 48261 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 36 |
| Coordinates | 26.868210, -97.735850 |
How ZIP+4 works in 78338
The four digits after the hyphen encode a delivery segment inside 78338. 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 78338 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 78338.
| ZIP | City | Distance |
|---|---|---|
| 78385 | Sarita, TX | 18.9 mi |
| 78580 | Raymondville, TX | 25.4 mi |
| 78590 | San Perlita, TX | 25.9 mi |
| 78540 | Edinburg, TX | 27.1 mi |
| 78561 | Lasara, TX | 29.7 mi |
| 78379 | Riviera, TX | 30.1 mi |
| 78598 | Port Mansfield, TX | 30.6 mi |
| 78353 | Encino, TX | 31 mi |
| 78549 | Hargill, TX | 31.8 mi |
| 78569 | Lyford, TX | 34.1 mi |
| 78563 | Linn, TX | 34.7 mi |
| 78355 | Falfurrias, TX | 36.3 mi |
Questions about 78338
What is the ZIP+4 code for 78338?
78338 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 78338, you need to look up a specific street address to get them.
What city is 78338?
78338 is assigned to Armstrong, Texas, in Kenedy 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.