ZIP Code 78830 — Big Wells, TX
78830 is a standard (street delivery) ZIP code serving Big Wells, Texas, in Dimmit 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 78830 at a glance
| ZIP code | 78830 |
|---|---|
| Primary city | Big Wells |
| State | Texas (TX) |
| County | Dimmit FIPS 48127 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 597 |
| Coordinates | 28.532260, -99.482190 |
How ZIP+4 works in 78830
The four digits after the hyphen encode a delivery segment inside 78830. 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 78830 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 78830.
| ZIP | City | Distance |
|---|---|---|
| 78827 | Asherton, TX | 16.3 mi |
| 78836 | Catarina, TX | 17.5 mi |
| 78839 | Crystal City, TX | 20.7 mi |
| 78017 | Dilley, TX | 21.4 mi |
| 78834 | Carrizo Springs, TX | 23.7 mi |
| 78014 | Cotulla, TX | 24.4 mi |
| 78001 | Artesia Wells, TX | 24.7 mi |
| 78829 | Batesville, TX | 25.5 mi |
| 78061 | Pearsall, TX | 33.2 mi |
| 78872 | La Pryor, TX | 35.4 mi |
Questions about 78830
What is the ZIP+4 code for 78830?
78830 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 78830, you need to look up a specific street address to get them.
What city is 78830?
78830 is assigned to Big Wells, Texas, in Dimmit 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.