While AASHTO enjoys the full participation of all 50 state departments of transportation, along with the District of Columbia and Puerto Rico, it is not easy piecing together specifically when each state actually formally joined the association.
When initially established, AASHTO offered a dues option for individuals as well as state departments. So in some cases an individual from a specific state might have joined formally before the agency. However, in reviewing the year in which each state first paid dues — either for individuals or as a department — we can piece together some of the story.
Interestingly, in many cases, most states joined as a department of transportation after individual members joined and found value in participating.
|Member||Individual Dues||Department Dues||Notes|
|Alaska||Admitted as a member in 1959|
|District of Columbia||1935||1950||However, admitted as a member in 1933|
|Massachusetts||1919||1915||Back-n-forth dues pattern until 1936|
|Montana||1919||1918||Went back to department dues in 1922|
|North Dakota||1919||1917||Went back to department dues in 1922|
|Puerto Rico||Granted membership privileges in 1923, but didn't start paying dues until 1937|
|Virginia||1915||1917||Went back to department dues in 1921|
|Wyoming||1919||1917||Went back to department dues in 1921|