Qualified council members are state, federal, and local agencies; state-supported universities, and statewide associations (see TGIC Charter for more information). Membership in TGIC is voluntary. Current membership includes:

• County Information Resources Agency
• Governor’s Office of Economic Development and Tourism
• Houston Advanced Research Center
• Office of the Attorney General
• Office of the Governor of Texas
• Public Utility Commission of Texas
• Railroad Commission of Texas
• Stephen F. Austin University Columbia Center
• Texas A&M University Academy for Advanced Telecommunications and Learning Technologies
• Texas A&M University Cooperative Extension
• Texas A&M University Department of Forest Science
• Texas A&M University Spatial Reference Center
• Texas Animal Health Commission
• Texas Army National Guard
• Texas Association of Counties
• Texas Association of Regional Councils
• Texas Board of Professional Land Surveying
• Texas Commission on Environmental Quality
• Texas Commission on State Emergency Communications
• Texas Department of Agriculture
• Texas Department of Assistive and Rehabilitative Services
• Texas Department of Criminal Justice
• Texas Department of Family and Protective Services
• Texas Department of Information Resources
• Texas Department of Insurance
• Texas Department of State Health Services
• Texas Department of Transportation
• Texas Education Agency
• Texas Facilities Commission
• Texas Forest Service
• Texas General Land Office
• Texas Health and Human Services Commission
• Texas Historical Commission
• Texas Legislative Council
• Texas Natural Resources Information System
• Texas Parks and Wildlife Department
• Texas State Soil and Water Conservation Board
• Texas State University
• Texas Tech University
• Texas Water Development Board
• United States Geological Survey
• University of Texas Bureau of Economic Geology
• University of Texas Center for Space Research