Custer County, Montana ZIP Codes

4 ZIP Codes

Zip Code
City
Population ↓
59301Miles City11,643
59336Ismay220
59338Kinsey136
59345Powderville35

Overview of ZIP Codes in Custer 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.
4
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 4 ZCTAs in Custer County, Montana (US Census).

Sources

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

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