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U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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Chouteau County ZIP Codes

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

County State ZIP Code City Area Codes
Chouteau County MT 59420 Carter 406
Chouteau County MT 59440 Floweree 406
Chouteau County MT 59442 Fort Benton 406
Chouteau County MT 59446 Geraldine 406
Chouteau County MT 59450 Highwood 406
Chouteau County MT 59460 Loma 406
Chouteau County MT 59520 Big Sandy 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.