The Ypsilanti District Library is a library that serves Ypsilanti, Ypsilanti Township, and Superior Township in eastern Washtenaw County, Michigan, with a permanent branch in each municipality, as well as a bookmobile that travels throughout the service area. The main location is at 5577 Whittaker Road in Ypsilanti Township, the downtown branch (formerly the main location) is at 229 West Michigan Avenue, and a third branch is at 8975 MacArthur Boulevard in Superior Township. The library has been in operation since 1868, and presently has more than 309,000 volumes.