American Academy of Environmental Engineers & Scientists
The American Academy of Environmental Engineers (AAEE) promotes excellence in the practice of environmental engineering to ensure the public health, safety, and welfare.
American Council of Engineering Companies
The American Council of Engineering Companies (ACEC) is the voice of America's engineering industry whose mission is to contribute to America's prosperity and welfare by advancing the business interests of member firms.
American Institute of Architects
The American Institute of Architects (AIA) serves as the voice of the architecture profession and the resource for their members through advocacy, information, and community.
American Planning Association
The American Planning Association (APA) and its professional institute, the American Institute of Certified Planners, are dedicated to advancing the art, science and profession of good planning — physical, economic and social — to create communities that offer better choices for where and how people work and live.
American Society of Civil Engineers
The American Society of Civil Engineers (ASCE) advances civil engineering and serves the public good through advancing technology, encouraging lifelong learning, developing civil engineer leaders, and advocating infrastructure and environmental stewardship.
American Society of Landscape Architects
The mission of the American Society of Landscape Architects (ASLA) is to lead, to educate, and to participate in the careful stewardship, wise planning, and artful design of our cultural and natural environments.
Center for Climate and Energy Solutions
The Center for Climate and Energy Solutions (C2ES) is an independent, nonpartisan, nonprofit organization working to advance strong policy and action to address the twin challenges of energy and climate change.
International City Manager’s Association Knowledge Network
The International City Manager’s Association (ICMA) Knowledge Network is committed to fostering excellence and innovation in local government. The Knowledge Network is an online community for local government professionals built on the following ideals:  rich content, social networking, and knowledge exchange, partnering, and global scope. 
Greenroads Foundation
The Greenroads Foundation continuously develops, evolves and sets the foremost design and construction standards for sustainability in the roadway industry.
ICLEI USA Local Governments for Sustainability
ICLEI USA is the leading nonprofit membership association devoted to local governments engaged in sustainability, climate protection, and clean energy initiatives.
Interagency Partnership for Sustainable Communities
The Partnership for Sustainable Communities, an interagency partnership between the Environmental Protection Agency (EPA), Department of Transportation (DOT), and  the Department of Housing and Urban Development (HUD), works to coordinate federal housing, transportation, water, and other infrastructure investments to make neighborhoods more prosperous, allow people to live closer to jobs, save households time and money, and reduce pollution. The partnership agencies incorporate six principles of livability into federal funding programs, policies, and future legislative proposals.
National Association of Counties
The National Association of Counties (NACo) advances issues with a unified voice before the federal government, improves the public’s understanding of county government, assists counties in finding and sharing innovative solutions through education and research, and provides value-added services to save counties and taxpayers money.
National Association of Regional Councils
The National Association of Regional Councils (NARC) serves as the national voice for regionalism by advocating for regional cooperation as the most effective way to address a variety of community planning and development opportunities and issues.
National Complete Streets Coalition
The National Complete Streets Coalition promotes federal and local policies that support complete streets which are designed and operated to enable safe access for all users.
National League of Cities
The National League of Cities (NLC) is dedicated to helping city leaders build better communities.  Working in partnership with the 49 state municipal leagues, NLC serves as a resource to and an advocate for the more than 19,000 cities, villages and towns it represents.
Sustainable Sites Initiative
The Sustainable Sites Initiative (SITES®) is an interdisciplinary effort by the American Society of Landscape Architects, the Lady Bird Johnson Wildflower Center at The University of Texas at Austin and the United States Botanic Garden to create voluntary national guidelines and performance benchmarks for sustainable land design, construction and maintenance practices.
Sustainable Urban Forest Coalition
The Sustainable Urban Forest Coalition (SUFC) is an assembly of national organizations working to advance a unified urban forest agenda for the nation's communities.
U.S. Environmental Protection Agency Office of Water Sustainable Infrastructure Initiative
This initiative is a collaborative effort between EPA and its federal, state, and local partners to develop guidance, provide technical assistance, and target federal state revolving fund capitalization funds and other relevant federal financial assistance to increase the sustainability of our water infrastructure.