sentences:  Over 5.9 million items were borrowed in 2017.The Dayton Metro Library ranks in the top ten best libraries in the United States serving a population of over 250,000 by HAPLR.The Dayton Metro Library system is considered a county system with branches in cities and towns throughout Montgomery County, Ohio, but does not have branches in Centerville, Germantown, Oakwood, Riverside or Washington Township.