ZIP Code 78609 — Buchanan Dam, TX
78609 is a standard (street delivery) ZIP code serving Buchanan Dam, Texas, in Llano 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 78609 at a glance
| ZIP code | 78609 |
|---|---|
| Primary city | Buchanan Dam |
| State | Texas (TX) |
| County | Llano FIPS 48299 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,983 |
| Coordinates | 30.759750, -98.452710 |
How ZIP+4 works in 78609
The four digits after the hyphen encode a delivery segment inside 78609. 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 78609 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 78609.
| ZIP | City | Distance |
|---|---|---|
| 78607 | Bluffton, TX | 4.6 mi |
| 78639 | Kingsland, TX | 7 mi |
| 78672 | Tow, TX | 8.7 mi |
| 78611 | Burnet, TX | 11.3 mi |
| 76824 | Bend, TX | 12.5 mi |
| 78657 | Horseshoe Bay, TX | 16.2 mi |
| 78643 | Llano, TX | 16.3 mi |
| 78654 | Marble Falls, TX | 19.4 mi |
| 76832 | Cherokee, TX | 22.8 mi |
| 78605 | Bertram, TX | 24.1 mi |
| 76885 | Valley Spring, TX | 25.2 mi |
| 78663 | Round Mountain, TX | 25.2 mi |
Questions about 78609
What is the ZIP+4 code for 78609?
78609 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 78609, you need to look up a specific street address to get them.
What city is 78609?
78609 is assigned to Buchanan Dam, Texas, in Llano 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.