The Volokh Conspiracy
Mostly law professors | Sometimes contrarian | Often libertarian | Always independent
What Is the Only State For Which the 2-Letter Postal Code Was Changed, and Why?
The codes were first adopted in 1963.
I just learned about this; you can see here for the answer.
Bonus question: What are the postal codes AA, AE, AP, FM, MH, MP, and PW?
