ESRI
ESRI Washington DC
http://www.esrimug.org/Office.htm
Northeast Arc User Group
Urban and Regional Systems Association (URISA)
Chesapeake Chapter of URISA (Maryland, DC, Virginia)
Mid-Atlantic Chapter of URISA (New Jersey, Eastern Pennsylvania, Delaware, and Northern Maryland)
GIS Certification Institute
GIS Day
Towson University Center for Geographic Information Sciences
Federal GIS Resources
Federal Geographic Data Committee (FGDC)
HAZUS
NOAA
USGS
State GIS Resources
DC Guide
Delaware DataMIL
Maryland State Geographic Information Committee (MSGIC)
New Jersey Geographic Information Network
https://njgin.state.nj.us/NJ_NJGINExplorer/index.jsp
Pennsylvania GIS Consortium (PAGIS)
Virginia Association for Mapping and Land Information Systems (VAMLIS)
http://www.vamlis.org/vamlis/index.asp
Virginia Association of Planning District Commissions (VAPDC)
http://www.institute.virginia.edu/vapdc/
Virginia Geographic Information Network (VGIN)
West Virginia GIS Technical Center