U.S. postal lookup

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.

42,735 verified records
All states and U.S. territories
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State directory

Michigan ZIP Codes

Complete postal directory, details, and geographic map for the State of Michigan.

State ZIP Code City County Area Codes
MI 49274 Reading Hillsdale County 517
MI 49276 Riga Lenawee County 517, 734
MI 49277 Rives Junction Jackson County 517
MI 49279 Sand Creek Lenawee County 419, 517, 567
MI 49281 Somerset Hillsdale County 517
MI 49282 Somerset Center Hillsdale County 517
MI 49283 Spring Arbor Jackson County 517
MI 49284 Springport Jackson County 517
MI 49285 Stockbridge Ingham County 517, 734
MI 49286 Tecumseh Lenawee County 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.