What does the ZIP in ZIP code stand for? July 26, 2020March 14, 2012 by Pamela Landy The zip code was named for the national Zoning Improvement Plan. Related Answers What is the Napoleonic Code and is it still binding in New Orleans? What happened if a movie did not meet with the requirements of the Hays Code? When was the Hays Code, which regulated moviemaking instituted? What was the Code of Hammurabi? When was the Comics Code Authority introduced? How much did the Marshall Plan for Europe after World War II cost?