ZIP Code 78751 — Austin, TX
78751 is a standard (street delivery) ZIP code serving Austin, Texas, in Travis 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 78751 at a glance
| ZIP code | 78751 |
|---|---|
| Primary city | Austin |
| State | Texas (TX) |
| County | Travis FIPS 48453 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 16,961 |
| Coordinates | 30.310800, -97.722780 |
How ZIP+4 works in 78751
The four digits after the hyphen encode a delivery segment inside 78751. 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 78751 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.
Other ZIP codes in Austin
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 78751.
| ZIP | City | Distance |
|---|---|---|
| 78756 | Austin, TX | 1.3 mi |
| 78722 | Austin, TX | 1.5 mi |
| 78705 | Austin, TX | 1.5 mi |
| 78752 | Austin, TX | 1.8 mi |
| 78712 | Austin, TX | 2 mi |
| 78723 | Austin, TX | 2.3 mi |
| 78703 | Austin, TX | 2.8 mi |
| 78757 | Austin, TX | 2.9 mi |
| 78701 | Austin, TX | 3 mi |
| 78702 | Austin, TX | 3.3 mi |
| 78721 | Austin, TX | 3.6 mi |
| 78731 | Austin, TX | 3.7 mi |
Questions about 78751
What is the ZIP+4 code for 78751?
78751 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 78751, you need to look up a specific street address to get them.
What city is 78751?
78751 is assigned to Austin, Texas, in Travis 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.