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The Modern Language Association created an interactive map resource using census data from the year 2000. It is able to give you data for numerous languages, down to county and zip code levels. There is also a compare feature, allowing you to compare concentrations of different locations or languages.
Part of the website of the Center for Ocean-Land-Atmosphere Studies, which is part of the Institute of Global Environment and Society, this site provides very detailed weather info, both current and forecast conditions.