#OnThisDate July 1, 1963: Postal Precision

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References / More Knowledge:
United States Postal Service. Publication 32 - Glossary of Postal Terms. 2007.
United States Postal Service. A Short History of the United States Postal Service. 2020.
Blount, Winton M. Report of the Postmaster General. United States Post Office Department, 1963.
U.S. Census Bureau. The ZIP Code: A New Tool for Census Data Collection. Washington, DC: Government Printing Office, 1983.
Smithsonian National Postal Museum. “Mr. ZIP.” Accessed June 30, 2025. https://postalmuseum.si.edu/object/npm_1993.2002.4
Campbell, Marcia. “The ZIP Code and Urbanization in America.” Journal of Urban History, vol. 22, no. 4, 1996, pp. 412–429.