25 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Atlanta | 1 | 518,107 | 499,896 | 0.71% | 3,831 | 135.25 | City |
| Stonecrest | 2 | 61,617 | 59,266 | 0.77% | 1,647 | 37.40 | City |
| Brookhaven | 3 | 58,702 | 56,809 | 0.65% | 4,785 | 12.27 | City |
| Dunwoody | 4 | 51,779 | 51,614 | 0.06% | 3,975 | 13.03 | City |
| East Point | 5 | 37,919 | 38,409 | -0.26% | 2,574 | 14.73 | City |
| Tucker | 6 | 36,855 | 37,155 | -0.16% | 1,823 | 20.22 | City |
| Chamblee | 7 | 32,927 | 30,211 | 1.68% | 4,280 | 7.69 | City |
| Redan | 8 | 30,904 | 34,870 | -0.45% | 3,821 | 8.09 | CDP |
| Decatur | 9 | 23,907 | 24,907 | -0.83% | 5,190 | 4.61 | City |
| Candler-McAfee | 10 | 22,628 | 24,419 | -0.11% | 3,250 | 6.96 | CDP |
| North Decatur | 11 | 17,304 | 15,833 | 0.23% | 3,524 | 4.91 | CDP |
| North Druid Hills | 12 | 16,814 | 18,074 | -0.84% | 4,275 | 3.93 | CDP |
| Belvedere Park | 13 | 14,410 | 15,028 | -0.34% | 2,942 | 4.90 | CDP |
| Clarkston | 14 | 14,171 | 14,733 | -0.78% | 7,681 | 1.84 | City |
| Doraville | 15 | 10,890 | 10,615 | 0.51% | 2,178 | 5 | City |
| Scottdale | 16 | 10,550 | 11,196 | -0.05% | 3,171 | 3.33 | CDP |
| Panthersville | 17 | 9,059 | 10,164 | -0.51% | 2,470 | 3.67 | CDP |
| Gresham Park | 18 | 7,912 | 9,148 | 0.41% | 2,819 | 2.81 | CDP |
| Druid Hills | 19 | 6,942 | 8,525 | -6.82% | 2,326 | 2.98 | CDP |
| Stone Mountain | 20 | 6,455 | 6,700 | -0.75% | 3,910 | 1.65 | City |
| Avondale Estates | 21 | 3,501 | 3,558 | -0.31% | 2,863 | 1.22 | City |
| Lakeview Estates | 22 | 2,719 | 2,546 | 0.07% | 5,352 | 0.51 | CDP |
| Lithonia | 23 | 2,531 | 2,660 | -1.02% | 2,727 | 0.93 | City |
| Milstead | 24 | 1,012 | 727 | 7.09% | 2,316 | 0.44 | CDP |
| Pine Lake | 25 | 734 | 771 | -0.94% | 3,097 | 0.24 | City |
Atlanta is the largest city in DeKalb County, with a population of 518,107.
Pine Lake is the smallest city in DeKalb County.
There are 25 cities in DeKalb County, Georgia.