Just curios which borough/surrounding area has the most Mafia activity. By my estimation (and this is far from conclusive) I'd say:

1. Brooklyn - Seems everyone has some action going on here. Headquarters of the Colombos and Bonannos, with Gambinos having a strong presence. Geonoveses and Luccheses also have some crews there.
2. Manhattan - Lucchese and Genovese have headquarters here. Gambinos with a strong presence. Colombos seem to be the only ones without a sizable presence.
3. The Bronx - Again, a Lucchese and Genovese headquarter.
4. Northern New Jersey - Genoveses have damn near an entire family there. Luccheses and Gambinos also with a strong presence.
5. Queens - Doesn't seem to be dominated by anyone with everyone having a small piece.
6. Staten Island - Such a small area, but littered with the Mafia's presence.
7.Connecticut - Smaller activity with the Genovseses (Matthew Ianniello) and Gambinos (Anthony Megale).

"I die outside; I die in jail. It don't matter to me," -John Franzese