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U.S. ZIP Codes Database 2026

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Valley County ZIP Codes

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

County State ZIP Code City Area Codes
Valley County ID 83611 Cascade 208, 986
Valley County ID 83615 Donnelly 208, 986
Valley County ID 83635 Lake Fork 208
Valley County ID 83638 Mccall 208, 986
Valley County ID 83677 Yellow Pine 208, 986
Golden Valley County MT 59046 Lavina 406
Golden Valley County MT 59074 Ryegate 406
Valley County MT 59225 Frazer 406
Valley County MT 59230 Glasgow 406
Valley County MT 59231 Saint Marie 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.