Canada
Calgary: Institute for Space Research
Mexico
Mexico City: Physics department at CINVESTAV
United States
NASA - Goddard Space Flight Center (Greenbelt, Maryland):
Laboratory for High Energy Astrophysics(also hosting GCN, the Gamma ray burst Coordinates Network,which was formerly called BACODINE, the BATSE COordinates DIstribution NEtwork)
High Energy Astrophysics Science Archive Research Center
Compton Observatory Science Support Center
Albuquerque (New Mexico): New Mexico Center for Particle Physics at the University of New Mexico
Ames (Iowa): Physics Department at Iowa State University
Ann Arbor (Michigan): Physics Department at University of Michigan
Baton Rouge (Louisiana): Space Physics Data System -- Cosmic Rays
Berkeley (California): LBL Institute for Nuclear and Particle Astrophysics and neutrino astrophysics group.
Boston (Massachusetts):Boston University Physics Department
Boulder (Colorado): Cosmic ray data at the National Geophysical Data Center (NGDC)
Cambridge (Massachusetts): High Energy Astrophysics Division of Harvard-Smithsonian Center for Astrophysics
Chicago (Illinois): University of Chicago high energy physics groups
College Park (Maryland): Particle astrophysics and space physics groups at the University of Maryland
Huntsville (Alabama): Astrophysics and Solar-Terrestial Research at the University of Alabama
Las Cruces (New Mexico): R.L. Golden Particle Astrophysics Lab at New Mexico State University
Madison (Wisconsin): Astrophysics at UW Madison Department of Physics
Newark (Delaware): Bartol Research Institute
Yew York (New York): Physics departments at Columbia University
Notre Dame (Indiana): Astrophysics Group
Pasadena (California): California Institute of Technology - Space Radiation Laboratory
Riverside (California): UCR High Energy Astrophysics Group
Salt Lake City (Utah): Experimental Astroparticle Physics at University of Utah
San Diego (California): Center for Astrophysics and Space Sciences
Santa Cruz (California): Santa Cruz Institute for Particle Physics
Seattle (Washington): Particle Astrophysics Group at University of Washington
Stanford (California): Stanford University
GLAST group at Stanford University
Kavli Institute for Particle Astrophysics & Cosmology (KIPAC)
Stanford Linear Accelerator Center (SLAC) Group K
St. Louis (Missouri): Washington University Laboratory for Experimental Astrophysics and McDonnell Center for the Space Sciences
West Lafayette (Indiana): Purdue University High Energy Astrophysics group