This is just a short article from Thomas Reuters foundation, titled
Communities that uprooted and relocated after disasters
The examples are short and recent, but none are in the U.S. I wish someone would do an in-depth study of this topic. I know there are several examples of U.S. communities that have relocated in their entirety — e.g, Valdez AK and Soldier’s Grove, WI. But I do not know of any significant analyses and studies.
Update: Please see the Comment section for some very useful examples and citations provided by readers.