Spanish is first, Chinese a distant second. I am guessing there are also plenty of indigenous people, especially in Alaska considering its isolation, who primarily speak native languages at home.
In California, you can ask for state forms in a huge number of languages. I was really surprised at the number when I went to get my California driver's license after I moved.
A friend of mine went to "the states" a year, somewhere in the early nineties and she was accused of cheating because she came in top tier on the english test ...
We were n°1 back then though, sweden has really lost it, plummeting off the podium to fourth place smh 😔