Listed below are links to the primary geospatial services office for the major federal agencies involved in GIS related activities.
Federal Emergency Management Agency
Federal Emergency Management Agency Region 3
Federal Geographic Data Committee
National Aeronautics and Space Administration
National Oceanic and Atmospheric Administration
NOAA – National Geodetic Survey
NOAA – Center for Operational Oceangraphic Products and Services
NOAA – Office of Coast Survey
United States Census Bureau
United States Department of Agriculture
United States Department of Transportation
United States Environmental Protection Agency
United States Environmental Protection Agency 3
United States Fish & Wildlife Service
United States Geological Survey
United States Geological Survey Spatial Data and Photography