U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
All states and U.S. territories
Maps and coordinates
County directory

Llano County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Llano County.

County State ZIP Code City Area Codes
Llano County TX 76831 Castell 325
Llano County TX 76885 Valley Spring 325
Llano County TX 78607 Bluffton 325, 512, 737
Llano County TX 78609 Buchanan Dam 325, 512, 737
Llano County TX 78639 Kingsland 325, 512, 737, 830
Llano County TX 78643 Llano 325, 830
Llano County TX 78657 Horseshoe Bay 325, 830
Llano County TX 78672 Tow 325, 512, 737

Geographic Map of Llano County

Postal context

About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.