• California Environmental Resources Evaluation System - CERES
• California Geographical Survey at the Department of Geography, California State University Northridge.

• Natural Hazards Center at the University of Colorado

• Georgia Spatial Data Infrastructure link to Georgia GIS Clearing House

• Idaho GIS Data from the Idaho Department of Water Resources

• University of Kentucky, Lexington, Agricultural Weather Center
• Kentucky Division of Geographic Information

• Massachusetts Geographic Information System

Minnesota

• The Minnesota GIS/LIS Consortium

Montana

• Montana Natural Resource Information System (NRIS)

• The University of New Mexico - Earth Data Analysis Center
• EDAC's Clearinghouse Services
• Resource Information Management System

• New York State GIS Clearinghouse

• Pennsylvania Spatial Data Access

• South Carolina Dept. of Natural Resources
• GIS Data Clearinghouse

• State of Texas, Government Information: Includes information on agencies, cities, counties, councils of government, traveling, working in Texas, etc.
• Texas State Agencies Contains general information about Texas Agencies, Boards, Colleges, Commissions, Courts, Departments, Offices, and Universities.
• Texas Natural Science Center, Research, and Collections
• The Texas Natural Resource Information System (TNRIS) archives some census data and ARC coverages of all 254 Texas County Boundaries. The (TNRIS) Download Area contains large numbers of various Texas GIS data files.
• The Texas Commission on Environemental Quality (TNRCC) archives metadata of Superfund Sites and Hazardous Waste Landfills in the state.
• Office of Water Resource Management
• The Texas Water Development Board (TWDB). 
• The Texas Department of Transportation  
• Roadway Information
• The Texas General Land Office .

• Utah Automated Geographic Reference Center

• West Virginia Department of Environmental Protection

•  Wyoming Geographic Information Science Center
• Wyoming Internet Map Server