Public Advocate Bill di Blasio has this information for those who are trying to contact American citizens in Haiti:

My thoughts and prayers are with the people of Haiti and all New
Yorkers whose families and loved ones have been affected by this
tragedy. I encourage anyone who is trying to get information about
U.S. citizens in Haiti to contact the American Citizens Services at
888-407-4747.  In the coming days, I will be working with community
organizations and my colleagues in government to assist with relief
efforts.”