Utah
the state with the highest population under 18 years of age — 30%

Source: U.S. Census Bureau
Additional Information: In contrast, Vermont has the lowest percentage of the population under 18 years of age — 19 percent. Nationwide, 22 percent of people are under the age of 18.
Reference: For more information, read the U.S. Census Bureau analysis, "QuickFacts." "QuickFacts."

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