Argentine Tango: NJ, NY, PA

New Jersey

ArgenTangoDancers (Cherry Hill)
http://www.argentangodancers.com/

Firehouse Tango (Maywood) http://www.firehousetango.com/

Red Bank Tango (Red Bank) http://redbanktango.com/

Tango Asado (Brookside) http://www.tangoasado.com/

Tango Pantera (Middletown) http://tangopantera.net/

Two for Tango (Bergen)
http://www.2fortango.org/

New York

Richard Lipkin's Guide to Argentine Tango in New York City
http://www.newyorktango.com/

Philadelphia

Seven Day Guide to Folk, Social and Traditional Dancing in and around Philadelphia (Tango included)
http://www.phillydance.com/