ZIP Code 78159 — Smiley, TX
78159 is a standard (street delivery) ZIP code serving Smiley, Texas, in Gonzales 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 78159 at a glance
| ZIP code | 78159 |
|---|---|
| Primary city | Smiley |
| State | Texas (TX) |
| County | Gonzales FIPS 48177 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 623 |
| Coordinates | 29.230310, -97.582470 |
How ZIP+4 works in 78159
The four digits after the hyphen encode a delivery segment inside 78159. 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 78159 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 78159.
| ZIP | City | Distance |
|---|---|---|
| 78677 | Wrightsboro, TX | 7.7 mi |
| 77994 | Westhoff, TX | 7.9 mi |
| 78140 | Nixon, TX | 12 mi |
| 78614 | Cost, TX | 12.6 mi |
| 78116 | Gillett, TX | 13.3 mi |
| 78111 | Ecleto, TX | 16.4 mi |
| 78143 | Pandora, TX | 16.9 mi |
| 78122 | Leesville, TX | 17 mi |
| 78164 | Yorktown, TX | 17.7 mi |
| 78629 | Gonzales, TX | 18.8 mi |
| 77954 | Cuero, TX | 19.6 mi |
| 78160 | Stockdale, TX | 20.9 mi |
Questions about 78159
What is the ZIP+4 code for 78159?
78159 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 78159, you need to look up a specific street address to get them.
What city is 78159?
78159 is assigned to Smiley, Texas, in Gonzales 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.