Nassau County

The most expensive suburb in the United States. Located on Long Island, right outside New York City. A small home in a bad neighborhood will be about $250,000 minimum. Nicest areas are along the South shore or North shore. The closer you are to water, the better. Lots of rich jews. If you are moving to Long Island, consider any of these areas:
South Shore:
Massapequa, Seaford, Merrick, Bellmore, Wantagh, Woodmere, Hewlett, Franklin Square
North Shore:
Great Neck, Roslyn, Syosset, Brookville, Jericho

South shore has wayyyy more shopping though and nicer beaches. Jones Beach is in Wantagh (a really nice area). Live as close to the water as possible!