The first visualization I could obtain without much effort is the number of LEED Accredited Professionals by state.  California leads the nation with over 11,300 LEED APs. New York comes in second with over 4,900 LEED APs.

However, when I normalized the data to display number of LEED APs per million people (based on 2007 census information), the picture changes quite a bit.

Washington, DC has a small population, but a relatively large LEED AP population with almost 2,300 LEED APs for every million people. California, on the other hand has 311 for every million people. A couple of things come to mind for why DC is so high:

• The USGBC keeps its headquarters in Washington, DC.  In 2006 they had 70 employees.
• Government LEED APs could skew the numbers.  GSA, US Dept of Interior, lobbyists, etc.
• A number of large architecture firms have offices in Washington DC (Gensler, HOK, Perkins + Will, RTKL, URS, etc.)

For the rest of the data, I am going to try and take this slow and dig through over the next couple of weeks.  I am interested to hear what type of charts you would like to see.  Make sure to leave a comment and I will see what I can do.