The Regional Asset District [RAD] gives a portion of the collections from Allegheny County's 1% sales tax add-on to libraries. The Carnegie Library of Pittsburgh gets the lion's share, with the rest shared between the 45 members of the Allegheny County Library Association. Hover over any municipality to see its assigned library, the population served, whether it gets an extra allocation for economic distress and its RAD allocation — total and per capita. Map shows each municipality, its library and the RAD allocation.