19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Forest Park | 1 | 19,181 | 19,818 | -0.62% | 2,080 | 9 | City |
| Forest Park | 2 | 19,181 | 19,778 | -0.62% | 2,080 | 9 | City |
| Riverdale | 3 | 14,479 | 15,039 | -0.73% | 3,298 | 4 | City |
| Riverdale | 4 | 14,479 | 15,011 | -0.73% | 3,298 | 4 | City |
| College Park | 5 | 13,964 | 13,894 | 0.08% | 1,250 | 11 | City |
| College Park | 6 | 13,964 | 13,907 | 0.08% | 1,250 | 11 | City |
| Lovejoy | 7 | 13,197 | 10,113 | 4.64% | 4,540 | 3 | City |
| Lovejoy | 8 | 13,197 | 10,271 | 4.64% | 4,540 | 3 | City |
| Irondale | 9 | 8,520 | 8,107 | 0.85% | 2,700 | 3 | CDP |
| Morrow | 10 | 6,187 | 6,573 | -1.2% | 1,772 | 3 | City |
| Morrow | 11 | 6,187 | 6,560 | -1.2% | 1,772 | 3 | City |
| Jonesboro | 12 | 6,114 | 5,963 | 0.49% | 2,043 | 3 | City |
| Jonesboro | 13 | 6,114 | 5,961 | 0.49% | 2,043 | 3 | City |
| Conley | 14 | 5,808 | 6,645 | -0.48% | 3,006 | 2 | CDP |
| Bonanza | 15 | 3,764 | 3,877 | 1.13% | 3,592 | 1 | CDP |
| Lake City | 16 | 2,872 | 2,962 | -0.59% | 1,549 | 2 | City |
| Lake City | 17 | 2,872 | 2,957 | -0.59% | 1,549 | 2 | City |
| Woolsey | 18 | 209 | 206 | 0% | 256 | 1 | Town |
| Woolsey | 19 | 209 | 206 | 0% | 256 | 1 | Town |
Forest Park is the largest city in Clayton County, with a population of 19,181.
Woolsey is the smallest city in Clayton County, with a population of 209.
There are 19 cities in Clayton County, Georgia.