14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Atlanta | 1 | 525,088 | 499,998 | 0.96% | 3,882 | 135 | City |
| Stonecrest | 2 | 61,451 | 59,269 | 0.71% | 1,643 | 37 | City |
| Brookhaven | 3 | 60,018 | 56,777 | 1.09% | 4,902 | 12 | City |
| Dunwoody | 4 | 51,844 | 51,596 | 0.09% | 3,980 | 13 | City |
| East Point | 5 | 38,237 | 38,400 | -0.09% | 2,595 | 15 | City |
| Tucker | 6 | 37,240 | 37,159 | 0.04% | 1,842 | 20 | City |
| Chamblee | 7 | 32,848 | 30,212 | 1.63% | 4,270 | 8 | City |
| Decatur | 8 | 24,376 | 24,904 | -0.43% | 5,292 | 5 | City |
| Clarkston | 9 | 14,336 | 14,733 | -0.55% | 7,770 | 2 | City |
| Doraville | 10 | 12,890 | 10,617 | 3.65% | 2,390 | 5 | City |
| Stone Mountain | 11 | 6,516 | 6,693 | -0.55% | 3,947 | 2 | City |
| Avondale Estates | 12 | 3,517 | 3,559 | -0.26% | 2,876 | 1 | City |
| Lithonia | 13 | 2,561 | 2,658 | -0.77% | 2,760 | 1 | City |
| Pine Lake | 14 | 747 | 770 | -0.66% | 3,152 | 0 | City |
Atlanta is the largest city in DeKalb County, with a population of 525,088.
Pine Lake is the smallest city in DeKalb County, with a population of 747.
There are 14 cities in DeKalb County, Georgia.