The Library shares its local history collection space with the Kawartha Branch of the Ontario Genealogical Society.

The Peterborough Mechanics Institute housed a subscription library that allowed members who paid a fee to borrow books.

The Peterborough Examiner declared that this branch at 729 Park Street S., made "south end residents the envy of the rest of the city."

In January 2022, Peterborough City Council voted to close the aging DelaFosse branch and replace it with a modernized facility in the proposed Twin Pad arena at Morrow Park.

The opening ceremonies were held on September 17 and featured Robertson Davies, Master of Massey College, University of Toronto, who was the keynote speaker.

This included an addition and renovation of the facade on the front of the building and the installation of a central staircase that created another access point between the upper and lower levels.

A temporary Main Location at the Peterborough Square complex opened in May 2016, and renovation of the old Aylmer St building began in July 2016.