ZIP Code 78384 — San Diego, TX
78384 is a standard (street delivery) ZIP code serving San Diego, Texas, in Duval 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 78384 at a glance
| ZIP code | 78384 |
|---|---|
| Primary city | San Diego |
| State | Texas (TX) |
| County | Duval FIPS 48131 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 5,747 |
| Coordinates | 27.730680, -98.470700 |
How ZIP+4 works in 78384
The four digits after the hyphen encode a delivery segment inside 78384. 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 78384 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 78384.
| ZIP | City | Distance |
|---|---|---|
| 78341 | Benavides, TX | 10.7 mi |
| 78357 | Freer, TX | 15 mi |
| 78332 | Alice, TX | 20.7 mi |
| 78342 | Ben Bolt, TX | 24.6 mi |
| 78376 | Realitos, TX | 24.8 mi |
| 78344 | Bruni, TX | 26.4 mi |
| 78349 | Concepcion, TX | 26.7 mi |
| 78372 | Orange Grove, TX | 29.4 mi |
| 78375 | Premont, TX | 30.5 mi |
| 78330 | Agua Dulce, TX | 34.1 mi |
| 78371 | Oilton, TX | 37.4 mi |
| 78383 | Sandia, TX | 40.1 mi |
Questions about 78384
What is the ZIP+4 code for 78384?
78384 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 78384, you need to look up a specific street address to get them.
What city is 78384?
78384 is assigned to San Diego, Texas, in Duval 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.