ZIP CodesZIP codes in Llano County, Texas
Llano County, Texas has 8 ZIP codes in this list, from 76831 to 78672. They cover 8 places, among them Castell, Valley Spring, Bluffton and Buchanan Dam.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 76831 | Castell | 8.2 | 30.701, -98.956 |
| 76885 | Valley Spring | 67.6 | 30.866, -98.836 |
| 78607 | Bluffton | 22.6 | 30.826, -98.515 |
| 78609 | Buchanan Dam | 15.9 | 30.754, -98.430 |
| 78639 | Kingsland | 43.9 | 30.666, -98.448 |
| 78643 | Llano | 712 | 30.715, -98.611 |
| 78657 | Horseshoe Bay | 38.8 | 30.544, -98.374 |
| 78672 | Tow | 29.9 | 30.861, -98.460 |
The ZIP code areas of Llano County add up to about 939 square miles of land (2,432 sq km) as the Census Bureau draws them. The largest is 78643 (Llano), with 712 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Castell, TX 76831.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.