Definitely Margate and Ventnor. In Margate, Decatur ave is where Merlino family lived. Also, on that same street, but a different house/apartment, is where Scarfo and Leonetti killed Falcone. And when I took a tour in the landmark "Lucy the Elephant" at Margate, the tour guide told us mobsters used to meet up inside the Elephant to discuss business and talk on the beach right in front. Also, some elderly women told us back in the day, it was becoming so common to see mobsters in Margate that people started calling it "Mob-gate".
Also, in Ventnor is where Nucky Johnson lived for awhile(a few years ago, an apartment for rent on Craigslist was listed as "the Real Nucky Thompson's former apartment". It said he only lived there for a few years). Another guy who lived in Ventnor is "Skinny D'Amato". He ran the 500 club and who was considered the "Next Nucky Johnson" . Also, a couple of guys arrested in that "Borgata Scandal" a few years back, were from Ventnor. Think it was Andrew Micali?