Oyster Bay Cove, N.Y.

Oyster Bay Cove, N.Y.

Overall rank: 8
Households: 1,050
Average income: $317,661
Average net worth: $1,625,524
Change in income since 2000: +5%
Income rank: 11
Net worth rank: 21

Oyster Bay Cove, on Long Island's North Shore, is home to the Northwood, a French Norman-style estate with a 17,000-square-foot mansion that was built in 1906 for banker Mortimer Schiff. Nassau County paid $11 million in 2007 to preserve half of the 60-acre estate. The town is covered with winding roads and elaborate mansions.