The Washington Examiner reports that the new report, conducted by the Center for Immigration Studies (CIS), also reveals that "As a share of the population, 21.8 percent of U.S. residents speak a foreign language at home — roughly double the 11 percent in 1980." Overall, roughly 67 million residents don't speak English at home. 

In New York City and Houston it is 49 percent; in Los Angeles it is 59 percent; in Chicago it is 36 percent; and in Phoenix it is 38 percent. -CIS

In terms of population, Spanish is the most commonly spoken language at home at 41 million residents in 2017, up from 37 million in 2010. Chinese is the next most common language at 3.4 million using it primarily at home.