ZIP Code 78371 — Oilton, TX
78371 is a standard (street delivery) ZIP code serving Oilton, Texas, in Webb 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 78371 at a glance
| ZIP code | 78371 |
|---|---|
| Primary city | Oilton |
| State | Texas (TX) |
| County | Webb FIPS 48479 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 101 |
| Coordinates | 27.549300, -99.047160 |
How ZIP+4 works in 78371
The four digits after the hyphen encode a delivery segment inside 78371. 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 78371 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 78371.
| ZIP | City | Distance |
|---|---|---|
| 78369 | Mirando City, TX | 8.9 mi |
| 78344 | Bruni, TX | 11.5 mi |
| 78043 | Laredo, TX | 13.9 mi |
| 78044 | Laredo, TX | 18 mi |
| 78046 | Laredo, TX | 22.7 mi |
| 78041 | Laredo, TX | 25.8 mi |
| 78040 | Laredo, TX | 28 mi |
| 78067 | San Ygnacio, TX | 34.7 mi |
| 78341 | Benavides, TX | 35.6 mi |
| 78019 | Encinal, TX | 35.8 mi |
| 78376 | Realitos, TX | 37 mi |
| 78361 | Hebbronville, TX | 37.2 mi |
Questions about 78371
What is the ZIP+4 code for 78371?
78371 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 78371, you need to look up a specific street address to get them.
What city is 78371?
78371 is assigned to Oilton, Texas, in Webb 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.