The United States Census Bureau just released their annual report on languages spoken in the United States, and it contains a whole of information.
Here are three accessible summaries:
All 300-plus languages spoken in American homes, and the number of people who speak them is from Quartz.
Multicultural California leads nation in linguistic complexity is from The Sacramento Bee.
At Least 350 Languages Spoken In U.S. Homes: New Report is from NBC News.
Here’s an excerpt from the last link:
You might also be interested in The Best Resources For Learning The Advantages To Being Bilingual.