[Ans] What is the only U.S. state whose official postal abbreviation is two vowels?

Step 1 : Introduction to the question "What is the only U.S. state whose official postal abbreviation is two vowels?"

..US District, Territory, and Possession Abbreviations and Capitals. ... Use the standard state abbreviations, with periods and spaces as shown, for all purposes other than postal addresses. The United States Post Office instituted two letter state abbreviations along with five digit zip codes in 1963.

Step 2 : Answer to the question "What is the only U.S. state whose official postal abbreviation is two vowels?"

Iowa:

The United States Postal Service has assigned a two-letter abbreviation to each of the 50 states. Modern two-letter abbreviated codes for the states and territories originated in October 1963, with the issuance of Publication 59: Abbreviations for Use with ZIP Code, three months after the Post Office introduced ZIP codes. Iowa (IA) is the only state in America with a two-vowel postal abbreviation code. The remaining states of Alabama (AL), Oklahoma (OK), and Illinois (IL) do not contain two-vowels in their official postal abbreviation.

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