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

Williamson County ZIP Codes

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

County State ZIP Code City Area Codes
Williamson County TN 37069 Franklin 615, 629
Williamson County TN 37135 Nolensville 615, 629
Williamson County TN 37174 Spring Hill 615, 629, 931
Williamson County TN 37179 Thompsons Station 615, 629, 931
Williamson County TN 38476 Primm Springs 615, 629, 931
Williamson County TX 76511 Bartlett 254, 512, 737
Williamson County TX 76527 Florence 254, 512, 737
Williamson County TX 76530 Granger 254, 512, 737
Williamson County TX 76537 Jarrell 254, 512, 737
Williamson County TX 76573 Schwertner 254, 512, 737
Page 3 of 6

Geographic Map of Williamson 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.