US "I" States Ranked by Population US States
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US "I" States Ranked by Population

While "M" and "N" states are more numerous (16), there are 4 "I" states in the U.S. There are 12 "vowel states" and "A" and "I" are the most common, followed by "O" and "U." Here are the "I" states, in order of population. Fast fact - the population of Illinois is greater than all the others combined.