ZIP Code 78674 — Weir, TX
78674 is a standard (street delivery) ZIP code serving Weir, Texas, in Williamson 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 78674 at a glance
| ZIP code | 78674 |
|---|---|
| Primary city | Weir |
| State | Texas (TX) |
| County | Williamson FIPS 48491 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 108 |
| Coordinates | 30.672130, -97.596530 |
How ZIP+4 works in 78674
The four digits after the hyphen encode a delivery segment inside 78674. 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 78674 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 78674.
| ZIP | City | Distance |
|---|---|---|
| 78626 | Georgetown, TX | 0.4 mi |
| 78634 | Hutto, TX | 8.3 mi |
| 78665 | Round Rock, TX | 8.7 mi |
| 78628 | Georgetown, TX | 9.2 mi |
| 76537 | Jarrell, TX | 10.1 mi |
| 78633 | Georgetown, TX | 10.4 mi |
| 76530 | Granger, TX | 10.6 mi |
| 76573 | Schwertner, TX | 11.6 mi |
| 78681 | Round Rock, TX | 11.9 mi |
| 78664 | Round Rock, TX | 11.9 mi |
| 76511 | Bartlett, TX | 13.5 mi |
| 76574 | Taylor, TX | 13.7 mi |
Questions about 78674
What is the ZIP+4 code for 78674?
78674 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 78674, you need to look up a specific street address to get them.
What city is 78674?
78674 is assigned to Weir, Texas, in Williamson 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.