WHIZ News The Muskingum County Library System offering Extended Hours beginning today DOWNTOWN ZANESVILLE, Ohio- June 1st is an important day for the Muskingum County Library System. The county’s libraries’ summer reading officially begins today as well as a change to their hours. All the libraries part of the Muskingum County Library System has officially extended their operating hours just in time for summer. “As of today, June 1st, we are extending all of our hours at all of our locations. Here at John McIntire, we are open from 10am-7pm Monday through Thursday, and on Fridays 10am-6pm, and Saturdays 10am-4pm,” Stacey Russel, executive direction of the MCLS said.