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U.S. ZIP Codes Database 2026

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Eaton County ZIP Codes

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

County State ZIP Code City Area Codes
Eaton County MI 48813 Charlotte 269, 517
Eaton County MI 48821 Dimondale 517
Eaton County MI 48827 Eaton Rapids 517
Eaton County MI 48837 Grand Ledge 517
Eaton County MI 48861 Mulliken 517
Eaton County MI 48876 Potterville 517
Eaton County MI 48890 Sunfield 517
Eaton County MI 48917 Lansing 517
Eaton County MI 49021 Bellevue 269, 517
Eaton County MI 49076 Olivet 269, 517
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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.