While much is online from the Census Bureau, researchers may need to go to a National Archives (NARA) location for microfilm. The National Archives at Atlanta is is in nearby Morrow, GA (5780 Jonesboro Rd., on the campus of Clayton State Univ.). Its visitor hours are Mon.-Fri., 8:30am-5:00pm. NARA's microfilm catalogs may be useful to peruse before a visit. The Georgia Archives are at 5800 Jonesboro Rd (also on campus of Clayton State Univ.). Visitor hours (as of March 2017): Tues.-Sat., 8:30am-5:00pm.
The Library subscribes to Ancestry Library edition database (from Ancestry.com and ProQuest), which has census population schedules up to 1940 - with names Search tips and more info. : http://proquest.libguides.com/ancestrylibraryedition
Social Explorer (library has one seat license for GT-authenticated users - please "sign out" after use.
Genealogy charts are on the National Archives site
Here are specific links to Census Bureau pages for Georgia: