James Edward Day (October 11, 1914 – October 29, 1996) was an American lawyer and business executive, most widely known as the United States Postmaster General under whose leadership the ZIP code was introduced.

Early years and career

James Edward Day was born in Jacksonville, Illinois. His clients included the Advertising Mail Marketing Association, an organization that particularly benefited from the ZIP code's use in targeting mass marketing campaigns by income level.

  • Index of Day's personal papers from the John F. Kennedy Presidential Library and Museum