A study by the Center for Immigration Studies (CIS), citing U.S. Census Bureau for 2017, found that almost half of residents of the five largest U.S. cities (48.2 percent) speak a language other than English at home. Among other findings of the study:
“In 2017, a record 66.6 million U.S. residents (native-born, legal immigrants, and illegal immigrants) ages five and older spoke a language other than English at home. The number has more than doubled since 1990, and almost tripled since 1980. 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.”
Read more at cis.org