State government

• Arizona Department of Economic Security
• Arizona Department of Environmental Quality
• Arizona Deparment of Environmental Quality, Southern Regional Office
• Arizona Commerce Authority
• State of Arizona
• Governor's Web Page
• University of Arizona

Federal government

• Davis-Monthan Air Force Base
• U.S. Department of Transportation
• U.S. Census Bureau
• U.S. Environmental Protection Agency, Region IX
• Federal Transit Administration
• Federal Highway Administration 

Arizona Councils of Governments and Metropolitan Planning Organizations

• Maricopa Association of Governments
• Central Arizona Governments
• Northern Arizona Council of Governments
• Southeastern Arizona Governments Organization
• Western Arizona Council of Governments
• Yuma Metropolitan Planning Organization
• CYMPO
• SCMPO
• FMPO
• LHMPO
• SVMPO

National Councils of Governments

• National Association of Regional Councils
• Association of Metropolitan Planning Organizations 

Transportation

• City of Tucson Department of Transportation
• Pima County Department of Transportation
• Arizona Department of Transportation, AZTech
• Sun Tran
• Tucson International Airport
• Tucson Airport Authority
• U.S. Bureau of Transportation Statistics
• U.S. Federal Railroad Administration
• U.S. Committee on Transportation and Infrastructure
• U.S. Code of Federal Regulations
• National Highway Traffic Safety Administration
• Transportation Equity Act for the 21st Century (TEA 21)
• Safe, Accountable, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU)
• Arizona Department of Transportation Intelligent Transportation Systems
• Institute of Transportation Engineers
• American Public Transportation Association
• National Transportation Center
• ITS Cooperative Deployments
• ITS Arizona Network
• Transportation Research Board 

Travel Reduction/Alternate Modes

• Arizona Department of Commerce Energy Programs
• Clean Cities
• National Bicycle Laws and Information 

 Air Quality

• Pima County Department of Environmental Quality
• U.S. Environmental Protection Agency
• University of Arizona Respiratory Sciences Center
• American Lung Association of Arizona
• American Lung Association State of the Air 2009 Report
• Real Time Air Quality Information for the Tucson Region - Air Info Now
• Pima County Department of Environmental Quality - Air Quality Division
• Arizona Department of Environmental Quality - Air Quality Division
• Western Regional Air Partnership
• It All Adds Up To Cleaner Air
• City of Tucson Office of Conservation and Sustainable Development

Water Quality

• Pima County Wastewater Reclamation Department
• Pima County Flood Control District
• Pima County Department of Environmental Quality
• City of Tucson Water Department
• City of Tucson Environmental Managment Division
• City of Tucson Stormwater Management Program
• Arizona Department of Environmental Quality
• Arizona Department of Water Resources
• U.S. Environmental Protection Agency, Water Program Information
• U.S. Environmental Protection Agency, Watershed Information
• U.S. Geological Survey
• Storm Flow Data
• Water Quality Data

Economic Development

• Tucson Regional Economic Opportunities Inc. (TREO)
• Rio Nuevo Downtown Redevelopment
• Downtown Tucson Partnership 
• Tucson Metropolitan Chamber of Commerce
• Tucson Hispanic Chamber of Commerce
• Northern Pima County Chamber of Commerce
• Metropolitan Tucson Convention and Visitors Bureau
• Arizona Manufacturing Extension Partnership
• State of Arizona
• Arizona Department of Commerce
• Pima County Department of Environmental Quality
• Pima County Attractions 
• Friends of Sabino Canyon 

Professional Organizations

• American Planning Association
• Association for Commuter Transportation
• Women in Transportation
• Women's Transportation Seminar

Environmental Web Sites

• Clean Cities - U.S. Department of Energy
• Arizona Alternative Fuels
• Alternative Fuels Data Center

Communications

• 3CMA: City-County Communications and Marketing Association

Safety

• Pima County Sheriff's Department 
• Tucson Police Department
• Rural/Metro Fire Department

Community

• Imagine Greater Tucson