Goodreads posted a list of 21st century books set in each U.S. state plus Washington D.C. and there were many comments of books readers would choose instead or in addition. The below list has three books for each state or territory, the first of which is from the original Goodreads list with the next two recommended by readers or, in the absence of recommendations for a particular state, a variety of books to round out the list. I was unable to find books set specifically in American Samoa, Guam or Mariana Island but did add Puerto Rico and the U.S. Virgin Islands to the list.
Thanks to Goodreads and all those who gave recommendations! Happy reading! =)