Region 1 (NASTO)

Region 1 (NASTO)

Northeast Association of State Highway and Transportation Officials

Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, District of Columbia


Region 2 (SASHTO)

Region 2 (SASHTO)

Southern Association of State Highway and Transportation Officials

Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, Puerto Rico, South Carolina, Tennessee, Virginia, West Virginia


Region 3 (MAASTO)

Region 3 (MAASTO)

Mid America Association of State Highway and Transportation Officials

Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Ohio, Wisconsin


Region 4 (WASHTO)

Region 4 (WASHTO)

Western Association of State Highway and Transportation Officials

Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, South Dakota, Texas, Utah, Washington, Wyoming