ZIP Code 78140 — Nixon, TX
78140 is a standard (street delivery) ZIP code serving Nixon, 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 78140 at a glance
| ZIP code | 78140 |
|---|---|
| Primary city | Nixon |
| State | Texas (TX) |
| County | Gonzales FIPS 48177 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,474 |
| Coordinates | 29.307580, -97.761900 |
How ZIP+4 works in 78140
The four digits after the hyphen encode a delivery segment inside 78140. 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 78140 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 78140.
| ZIP | City | Distance |
|---|---|---|
| 78143 | Pandora, TX | 6.7 mi |
| 78122 | Leesville, TX | 9.8 mi |
| 78677 | Wrightsboro, TX | 10.4 mi |
| 78160 | Stockdale, TX | 11 mi |
| 78159 | Smiley, TX | 12 mi |
| 78614 | Cost, TX | 12.4 mi |
| 78116 | Gillett, TX | 13.4 mi |
| 78161 | Sutherland Springs, TX | 17.4 mi |
| 78111 | Ecleto, TX | 18.7 mi |
| 78155 | Seguin, TX | 18.8 mi |
| 77994 | Westhoff, TX | 19.9 mi |
| 78121 | La Vernia, TX | 20.7 mi |
Questions about 78140
What is the ZIP+4 code for 78140?
78140 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 78140, you need to look up a specific street address to get them.
What city is 78140?
78140 is assigned to Nixon, 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.