The U.S. Census Bureau has released a web-based map application built to display language data  collected from the American Community Survey .
Language use, English-speaking ability, and linguistic isolation data are currently collected in the American Community Survey. In the past, various questions on language were asked in the censuses from 1890 to 1970. The current language use questions, in use since 1980, gather how many people speak a language other than English at home, what languages are spoken, and how well English is spoken.
For most people residing in the United States, English is the only language spoken in the home. However, many languages other than English are spoken in homes across the country. Data on speakers of languages other than English and on their English-speaking ability provide more than an interesting portrait of our nation. Routinely, these data are used in a wide variety of legislative, policy, legal, and research applications.