How many architecture firms are there?

17,500 architecture firms in the United States

There are currently more than 81,000 members of the AIA (The American Institute of Architects).  Some of them work in architecture firms, while the others work in universities, government or corporate sector.  There are more and more architecture firms all over the world.  For example, in the United States of America there were 17500 architecture firms in 2011.  It is important to know that architecture firms employ approximately 158,000 people in the United States.  This is definitely something.  36% of them are licensed architects.