From the Troy Public Library site:
I am pleased to announce that Hennen's American Public Library Ratings has ranked the Troy Public Library the 10th best library in the United States for our population category in 2009.
The Troy Public Library is also the 2nd highest ranked library in Michigan for our population size (tied with West Bloomfield Public Library, after Canton Public Library), and tied for 4th place overall in the state.
The HAPLR ratings are based on many factors, including circulation, staffing, materials, reference service, and funding levels. Data is based on statistics collected in the 2006/2007 reporting year.
The complete rankings can be found at Hennen's American Public Library Ratings.