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
Maps and coordinates
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 49229 Britton Lenawee County 517, 734
MI 49230 Brooklyn Jackson County 517
MI 49232 Camden Hillsdale County 419, 517, 567
MI 49233 Cement City Hillsdale County 517
MI 49234 Clarklake Jackson County 517
MI 49235 Clayton Lenawee County 517
MI 49236 Clinton Lenawee County 517, 734
MI 49237 Concord Jackson County 517
MI 49238 Deerfield Lenawee County 517, 734
MI 49239 Frontier Hillsdale County 517
Page 73 of 117

Geographic Map of Michigan

Postal context

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.