- The Best School In The Whole Wide World Nickajack Elementary School 4555 Mavell Rd Smyrna, GA 30082 (770)319-3966 NATIONAL SCHOOL OF CHARACTER Nickajack is proud to be one of the Cobb County School District's newest elementary schools, which is among the largest three school systems in Georgia and the 35th largest in the United States. We are qualifying with the Kamaron Institute as an Official ...www.cobb.k12.ga.us/~nickajack/index.htm