IIRC Alpine NJ is second to Beverly Hills.
New Jersey is one of the wealthiest states in the United States of America, with a per capita income of $35,928 (2012) and a personal per capita income of $50,781 (2010). Its median household income is $71,637 (2012) and its median family income is $87,389 (2012), both the second highest in the country. The median value of an owner-occupied housing unit is $337,900 (2012), ranked fifth in the country.[2][4] New Jersey has the highest percentage of millionaire residents in the country with 7.12% of New Jersey households having $1 million or more liquid or investible assets, not including equity in homes.