According to the American Library Association, there are almost 9 thousand separate public library systems in the US, and over 15 thousand buildings and branches. That makes for a very large portion of the over $5 billion library market.

 As a national show, the Public Library Association marks a great opportunity to reach these 9 thousand systems in one venue. And, as it only happens once every two years, PLA is always has a great draw—around 10 thousand in total attendence