ZIP Code 75831 — Buffalo, TX
75831 is a standard (street delivery) ZIP code serving Buffalo, Texas, in Leon 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 75831 at a glance
| ZIP code | 75831 |
|---|---|
| Primary city | Buffalo |
| State | Texas (TX) |
| County | Leon FIPS 48289 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 4,881 |
| Coordinates | 31.457450, -96.022750 |
How ZIP+4 works in 75831
The four digits after the hyphen encode a delivery segment inside 75831. 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 75831 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 75831.
| ZIP | City | Distance |
|---|---|---|
| 75855 | Oakwood, TX | 12.1 mi |
| 75846 | Jewett, TX | 12.1 mi |
| 75838 | Donie, TX | 12.2 mi |
| 75833 | Centerville, TX | 17.2 mi |
| 75860 | Teague, TX | 17.4 mi |
| 77865 | Marquez, TX | 20.1 mi |
| 77855 | Flynn, TX | 22 mi |
| 75840 | Fairfield, TX | 22.8 mi |
| 75850 | Leona, TX | 23.3 mi |
| 75886 | Tennessee Colony, TX | 23.6 mi |
| 75884 | Tennessee Colony, TX | 24.1 mi |
| 76687 | Thornton, TX | 28 mi |
Questions about 75831
What is the ZIP+4 code for 75831?
75831 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 75831, you need to look up a specific street address to get them.
What city is 75831?
75831 is assigned to Buffalo, Texas, in Leon 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.