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U.S. ZIP Codes Database 2026

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Big Horn County ZIP Codes

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

County State ZIP Code City Area Codes
Big Horn County MT 59016 Busby 406
Big Horn County MT 59022 Crow Agency 406
Big Horn County MT 59025 Decker 307, 406
Big Horn County MT 59031 Garryowen 406
Big Horn County MT 59034 Hardin 406
Big Horn County MT 59035 Fort Smith 406
Big Horn County MT 59050 Lodge Grass 307, 406
Big Horn County MT 59066 Pryor 406
Big Horn County MT 59075 Saint Xavier 406
Big Horn County MT 59089 Wyola 307, 406
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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.