[Answer] What is the only state postal abbreviation with two vowels?

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...1. Oklahoma 2. Iowa 3. Ohio 4. Indiana

Step 2 : Answer to the question "What is the only state postal abbreviation with two vowels?"

Iowa - Searching your brain for postal codes? With 50 U.S. states, you’d think at least a few of them would have a postal abbreviation consisting of two vowels. But only Iowa holds that distinction with its “IA” abbreviation. A possible reason that “IA” was used for the postal code instead of the traditional first two letters of the state name ("IO") is that the latter may be confused with the numbers one and zero. But Iowa's first two letters do make it unique for another reason: It's the only state name to begin with two vowels in a row.:

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