This document summarizes the work done by the Federation of Ontario Public Libraries (FOPL) to measure the value, impact, and presence of Ontario public libraries. It discusses how FOPL collaborated with libraries to identify priorities and collect longitudinal data on usage. FOPL lobbied the government, published reports analyzing usage data, and conducted public opinion polls. The results showed high library usage and that libraries are achieving their missions of supporting education, economic development, and communities. FOPL is now working to increase government influence and better communicate the value of libraries through research-backed marketing.