A map of the languages of the USA (2011)
census.gov
census.gov
-Huge Polish population in Chicago and Michigan
-Huge Asian (Chinese, Japanese, Tagalog, Korean, Vietnamese) population in Hawaii
Other than that it was mostly a population map to my eyes.
German is more distributed in rural areas rather than just concentrated in big cities.
Francophile Atlanta was a shock though. Friends of mine who lived there insist they met no French speakers. But apparently they're there somewhere. Maybe post-Katrina refugees, or a Haitian immigrant community? No idea.