14 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Atlanta | 1 | 530,106 | 499,998 | 0.96% | 3,919 | 135 | City |
| Stonecrest | 2 | 61,888 | 59,269 | 0.71% | 1,655 | 37 | City |
| Brookhaven | 3 | 60,666 | 56,777 | 1.08% | 4,955 | 12 | City |
| Dunwoody | 4 | 51,894 | 51,596 | 0.1% | 3,984 | 13 | City |
| East Point | 5 | 38,205 | 38,400 | -0.08% | 2,593 | 15 | City |
| Tucker | 6 | 37,256 | 37,159 | 0.04% | 1,843 | 20 | City |
| Chamblee | 7 | 33,375 | 30,212 | 1.6% | 4,338 | 8 | City |
| Decatur | 8 | 24,271 | 24,904 | -0.43% | 5,269 | 5 | City |
| Clarkston | 9 | 14,257 | 14,733 | -0.55% | 7,727 | 2 | City |
| Doraville | 10 | 13,345 | 10,617 | 3.53% | 2,475 | 5 | City |
| Stone Mountain | 11 | 6,481 | 6,693 | -0.54% | 3,925 | 2 | City |
| Avondale Estates | 12 | 3,509 | 3,559 | -0.23% | 2,869 | 1 | City |
| Lithonia | 13 | 2,542 | 2,658 | -0.74% | 2,739 | 1 | City |
| Pine Lake | 14 | 743 | 770 | -0.54% | 3,135 | 0 | City |
Atlanta is the largest city in DeKalb County, with a population of 530,106.
Pine Lake is the smallest city in DeKalb County, with a population of 743.
There are 14 cities in DeKalb County, Georgia.