| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Savannah | 1 | 150,080 | 147,517 | 0.43% | 1,371 | 109 | City |
| Pooler | 2 | 34,157 | 25,653 | 4.32% | 1,233 | 28 | City |
| Port Wentworth | 3 | 18,616 | 10,914 | 5.75% | 1,158 | 16 | City |
| Garden City | 4 | 10,567 | 10,410 | 0.51% | 738 | 14 | City |
| Tybee Island | 5 | 3,170 | 3,107 | 0.44% | 1,100 | 3 | City |
| Bloomingdale | 6 | 3,142 | 2,857 | 2.11% | 224 | 14 | City |
| Thunderbolt | 7 | 2,534 | 2,554 | 0% | 1,887 | 1 | Town |
| Vernonburg | 8 | 141 | 138 | 0% | 350 | 0 | Town |
Savannah is the largest city in Chatham County, with a population of 150,080.
Vernonburg is the smallest city in Chatham County, with a population of 141.
There are 8 cities in Chatham County, Georgia.