I found this interesting - based on the 2011 American Community Survey data, the US Census Bureau has published mapping data of the concentrations of speakers of various languages, with a breakdown of overall speakers of the language and those who identify their English as "less than very good".
Closing the explanatory pop-up that appears in the middle will allow you to proceed to selecting the desired language and level. You can zoom in and out and adjust the map background as desired.
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