Half of Foreign-Born Proficient in English

Among the 41 million foreign-born living in the United States, nearly half (49.9%) are proficient in English: 15.4 percent speak only English at home, and another 34.5 percent speak a language other than English at home but say they speak English "very well."

Fewer than one-third do not speak English at all (9.6%) or "not well" (19.3%). 

Source: Census Bureau, American Community Survey, English-Speaking Ability of the Foreign-Born Population in the United States: 2012