Join the Cobb County Tax Commissioner’s Office for an overview of property taxes, motor vehicle services, and resident exemptions. Learn about essential community resources and get vital details on property tax. Getting to Know Cobb: Presented by the Cobb County Tax Commissioner’s Office is a free Cobb County Public Library program at Powder Springs Library in Powder Springs. Expect a learning-focused library session for adults and seniors, with branch staff or community presenters guiding the activity. The listed time is 11:00-12:00.