ZIP Code 78374 — Portland, TX
78374 is a standard (street delivery) ZIP code serving Portland, Texas, in San Patricio 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 78374 at a glance
| ZIP code | 78374 |
|---|---|
| Primary city | Portland |
| State | Texas (TX) |
| County | San Patricio FIPS 48409 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 20,408 |
| Coordinates | 27.888490, -97.293660 |
How ZIP+4 works in 78374
The four digits after the hyphen encode a delivery segment inside 78374. 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 78374 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 78374.
| ZIP | City | Distance |
|---|---|---|
| 78359 | Gregory, TX | 2.9 mi |
| 78362 | Ingleside, TX | 5.8 mi |
| 78336 | Aransas Pass, TX | 7.6 mi |
| 78402 | Corpus Christi, TX | 8.3 mi |
| 78390 | Taft, TX | 8.7 mi |
| 78401 | Corpus Christi, TX | 9.1 mi |
| 78404 | Corpus Christi, TX | 10.5 mi |
| 78407 | Corpus Christi, TX | 10.9 mi |
| 78408 | Corpus Christi, TX | 11 mi |
| 78405 | Corpus Christi, TX | 11.9 mi |
| 78411 | Corpus Christi, TX | 12.3 mi |
| 78416 | Corpus Christi, TX | 13 mi |
Questions about 78374
What is the ZIP+4 code for 78374?
78374 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 78374, you need to look up a specific street address to get them.
What city is 78374?
78374 is assigned to Portland, Texas, in San Patricio 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.