The National Association of City Transportation Officials (NACTO) is a membership network that provides support and resources for city transportation officials in cities of all sizes. Member cities are Atlanta, Baltimore, Boston, Chicago, Detroit, Houston, Los Angeles, Minneapolis, New York, Philadelphia, Phoenix, Portland, San Francisco, Seattle, and Washington, D.C. 

NACTO is a 501(c)(3) non-profit association that represents large cities on transportation issues of local, regional and national significance. NACTO views the transportation departments of major cities as effective and necessary partners in regional and national transportation efforts, promoting their interests in federal decision-making. They facilitate the exchange of transportation ideas, insights and best practices among large cities, while fostering a cooperative approach to key issues facing cities and metropolitan areas.

As a coalition of city transportation departments, NACTO is committed to raising the state of the practice for street design and transportation by building a common vision, sharing data, peer-to-peer exchange in workshops and conferences, and regular communication among member cities. 

Island Press publishes NACTO's design guides: Urban Street Design Guide charts the principles and practices of the nation’s foremost engineers, planners, and designers working in cities today; Urban Bikeway Design Guide provides cities with state-of-the-practice solutions that can help create complete streets that are safe and enjoyable for bicyclists.