California
the state with the highest percentage of people over age 5 who speak a language other than English at home — 44%

Source: U.S. Census Bureau
Additional Information: California is followed by Texas at 36 percent. For the country as a whole, 22 percent of the population over age 5 speaks a language other than English at home. This is according to 2014-2018 data.
Reference: For more information, read the U.S. Census Bureau analysis, "QuickFacts." "QuickFacts."

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