HomeCobb libraries expand hours Cobb libraries expand hours Marietta.com To better serve Cobb residents, the county’s public libraries are expanding and adjusting their hours of operation at all branches. A summary of new hours for all library branches is available at cobbcat.org. Subscribe Notify of new follow-up comments new replies to my comments Label {} [+] Name* Email* Label {} [+] Name* Email* 0 Comments Weather Marietta broken clouds enter location 68.3 ° F 71.4 ° 66.5 ° 89 % 1.7mph 75 % Thu 74 ° Fri 72 ° Sat 65 ° Sun 66 ° Mon 67 °