I would think the Genovese are still hovering around 200, although likely with an average age in the low 60's or so.

Gambino's might be a little younger with the zips, probably closer to 150.

The other three closer to 100 each, Colombos must be under 100 active members at this point.

DeCavalcantes really are just a glorified crew at this point. Philly as chin says, maybe 50-60. Boston a little weaker than that but still there.

Chicago and Detroit on life support and not expected to make it. Buffalo has stopped responding but doctors from Canada are still attempting to resuscitate. Other cities where there has been a past presence may have some retired guys or guys with a little bit of side hustle in gambling and bookmaking going on, but at this point that's functioning more on a social level not much different than joining the legion.

Montreal has its problems but is still a major factor. Lots of dollars left to fight over in Montreal and therefore they're not going anywhere.

In my town where there had been some historical presence, its gone now but a lot of the guys that had those affiliations, or the sons of those guys still hang out in certain places to look and act the part - but its all for show. In one such place there's still a room in the back full of slot machines and you can lay a bet with the guy at the bar if he knows you, but its mostly for show.

As NYMafia has pointed out, the era of all this is over. It existed once upon a time as a response by first-generation immigrants and mutated from there. But 100 years in the melting pot has made Italians into Americans and that's been a great thing - except for the Mafia. There will always be some zips around and in some form this thing will keep going but the golden days of Costello, Hoffa, the Vegas Casinos, its loooooooooong over with. Finished, done. Purely an avenue of historical research now.