Everyone that has been posting that Billy D'Elia was/is the last remaining member of the Bufalino crime family is one hundred percent correct. The Scranton family has one known member in D'Elia (although I would say there is a chance that D'Elia maybe made one or two guys without the FBI knowing, thirty guys is way far fetched).
Many families are extinct (Denver, Dallas, Rochester, San Francisco, San Diego), near extinct (New Orleans, Pittsburgh, Los Angeles, Tampa), on their last legs (Buffalo), medium sized (New Jersey, Philadelphia, New England) or are one of the large and powerful families (Outfit, Partnership, the five families).
I really wouldn't consider Detroit to be one of the "large and powerful" families. Despite what some others here want to believe, it's not even a medium sized family at this point. Medium sized families would be those like Chicago, New England, New Jersey, and Philadelphia which each have about 50 members. Detroit has about 30 at most and is not nearly as active as those others. And it's not even close to the five New York families, which have anywhere from 100-200 members.
You're basically spot on with everything else though. You can also add the San Jose family to the extinct list. Maybe you meant them, since San Diego didn't last past Prohibition. You can also add Cleveland, Milwaukee, St. Louis, and Kansas City to the near extinction list.
