Parent Retreat Centers
Insight Meditation Society
Spirit Rock
Gaia House

Regional Insight Meditaton Retreat Centers - USA
Central
Mid America Dharma

East Coast
Cambridge Insight Meditation Center
Downtown New York Insight Meditation Center
Insight Meditation Community of Washington DC
New York Insight Meditation Center

West Coast
Insight Meditation Community of San Francisco
Seattle Insight Meditation Society

Hawaii
Vipassana Hawaii
Vipassana Metta on Maui

Monastic Centers (USA)
Abhayagiri Monastery
Metta Forest Monastery

Texas Dharma Leaders
Houston - Mary Rees
San Antonio - Randy Gribbin

In Depth Resource on all Buddhist Traditions
DharmaNet