The document also proposes eliminating all part-time positions, a total of 124 employees, which would affect library hours.
Any closure or consolidation would be approved as part of the 2019 budget in July.
Commission Chairman Mike Boyce said he expected a “spirited” discussion in the coming weeks, acknowledging that libraries, like senior centers, are a “third rail” in local politics.
“We’re not turning this into a crisis,” he said. “We’re going to be talking about it for the next five months.”
Cobb recently celebrated the opening of the new, $10 million Sewell Mill Library and Cultural Center, which replaced the East Marietta Library, despite a lack of a sustainable operating budget.
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In other Cobb news:
Marietta will be the second city in Cobb County, following Marietta, to make it illegal.