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U.S. ZIP Codes Database 2026

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Shiawassee County ZIP Codes

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

County State ZIP Code City Area Codes
Shiawassee County MI 48414 Bancroft 517, 810, 989
Shiawassee County MI 48418 Byron 517, 810, 989
Shiawassee County MI 48429 Durand 810, 989
Shiawassee County MI 48449 Lennon 810, 989
Shiawassee County MI 48460 New Lothrop 810, 989
Shiawassee County MI 48476 Vernon 989
Shiawassee County MI 48817 Corunna 810, 989
Shiawassee County MI 48841 Henderson 989
Shiawassee County MI 48848 Laingsburg 517, 989
Shiawassee County MI 48857 Morrice 517, 989
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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.