Jefferson County, Montana ZIP Codes

Zip Code
City
Population ↓
59634Clancy5,521
59759Whitehall3,631
59632Boulder2,557
59638Jefferson City769
59721Cardwell423
59631Basin375

Overview of ZIP Codes in Jefferson 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.
6
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 6 ZCTAs in Jefferson County, Montana (US Census).

Sources

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

Recommended Reading