TML has a vast variety of collections available. Those collections range from rare books located in the Special Collections Room to the latest in electronic media. The Museum located on the upper level of the library has a rotating display of historical artifacts from early Lancaster and the Civil War. The Trustees exhibit, located just past the elevator on the main level of the library, contains items on display from the Rare Book collection. The exhibit is changed on a regular basis.

Throughout the library, along the walls, there is a timeline of the 150 year history of the library. Enjoy the pictures along the timeline to see how the library has grown over those years. And be sure to view the plaque in the reference room dedicated to the Lancastrians who gave their lives during the Civil War.