Of the nine counties included in the study, Gwinnett County outpaced six — Cobb, DeKalb, Douglas, Fayette, Fulton and Rockdale — in growth rates. DeKalb's rate was the lowest, at 1.23 percent. Henry County grew by 2.4 percent (5,400 people) and Cherokee County grew by 3.04 percent (7,300 people). Both counties have smaller populations than Gwinnett County. None of the counties in the study decreased in population.
Read more about metro Atlanta's population growth here.