ZIP Code 78017 — Dilley, TX
78017 is a standard (street delivery) ZIP code serving Dilley, Texas, in Frio 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 78017 at a glance
| ZIP code | 78017 |
|---|---|
| Primary city | Dilley |
| State | Texas (TX) |
| County | Frio FIPS 48163 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 5,551 |
| Coordinates | 28.724560, -99.204550 |
How ZIP+4 works in 78017
The four digits after the hyphen encode a delivery segment inside 78017. 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 78017 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 78017.
| ZIP | City | Distance |
|---|---|---|
| 78061 | Pearsall, TX | 13 mi |
| 78830 | Big Wells, TX | 21.4 mi |
| 78014 | Cotulla, TX | 23.2 mi |
| 78057 | Moore, TX | 24.4 mi |
| 78829 | Batesville, TX | 25.2 mi |
| 78005 | Bigfoot, TX | 25.8 mi |
| 78011 | Charlotte, TX | 29 mi |
| 78886 | Yancey, TX | 29.7 mi |
| 78021 | Fowlerton, TX | 30.1 mi |
| 78001 | Artesia Wells, TX | 32.5 mi |
| 78839 | Crystal City, TX | 33.3 mi |
| 78016 | Devine, TX | 35.1 mi |
Questions about 78017
What is the ZIP+4 code for 78017?
78017 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 78017, you need to look up a specific street address to get them.
What city is 78017?
78017 is assigned to Dilley, Texas, in Frio 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.