There is a language spoken by a group on a kind of mesa in New Mexico. Smithsonian has an article on this group this month, I think, but no language information.
Looking for Language Information on language in NM.
The article talked about the Acoma people. They speak a Keresan language, which is a language isolate.
http://en.wikipedia.org/wiki/Keresan_languages
http://en.wikipedia.org/wiki/Keresan_languages