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 light intensity drizzle enter location 63.8 ° F 64.9 ° 62.4 ° 94 % 3.2mph 100 % Wed 68 ° Thu 72 ° Fri 72 ° Sat 62 ° Sun 64 °