From an ARL Announcement:
The Institute of Museum and Library Services (IMLS) has updated its Public Libraries in the United States Survey (PLS) search and compare tools with FY 2011 unimputed data. The survey collects descriptive statistics annually from more than 9,000 public libraries in the US.
Read the Complete Post
Direct to IMLS Public Library Data Search Tool
Direct to IMLS Public Library Data Compare Tool
Hat Tip: Knowledgespeak.com