Caldwell County, Texas ZIP Codes

7 ZIP Codes

Zip Code
City
Population ↓
78644Lockhart22,348
78616Dale10,683
78648Luling7,863
78655Martindale3,730
78656Maxwell2,847
78661Prairie Lea835
78622Fentress331

Overview of ZIP Codes in Caldwell County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
7
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 7 ZCTAs in Caldwell County, Texas (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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