List of United States Postal Service (USPS) Zone Improvement Plan (ZIP) Codes found within or partially within the borders of the City of Detroit.Implemented in 1963, ZIP Codes were created by the USPS to improve the efficient delivery of mail. The first digit in the code designates a broad geographic area in the United States. The following two digits pinpoint population concentrations and sectional centers accessible to common transportation networks. The final two digits designate small Post Offices or postal zones. For more information on ZIP Codes, refer to The United States Postal Service: An American History.ZIP Codes are one component of a mailing address and are not themselves suitable for mapping. For areal representations of City of Detroit ZIP Codes, please refer to our City of Detroit ZIP Code Tabulation Areas (ZCTAs) dataset.More information on the difference between ZIP Codes and ZCTAs can be found on the US Census Bureau's website.