8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Savannah | 1 | 149,465 | 147,494 | 0.22% | 1,365 | 109 | City |
| Pooler | 2 | 33,917 | 25,678 | 4.22% | 1,224 | 28 | City |
| Port Wentworth | 3 | 16,838 | 10,918 | 6.23% | 1,048 | 16 | City |
| Garden City | 4 | 10,602 | 10,404 | 0.31% | 740 | 14 | City |
| Bloomingdale | 5 | 3,221 | 2,857 | 1.93% | 230 | 14 | City |
| Tybee Island | 6 | 3,155 | 3,106 | 0.25% | 1,095 | 3 | City |
| Thunderbolt | 7 | 2,527 | 2,553 | -0.16% | 1,882 | 1 | Town |
| Vernonburg | 8 | 141 | 137 | 0.71% | 350 | 0 | Town |
Savannah is the largest city in Chatham County, with a population of 149,465.
Vernonburg is the smallest city in Chatham County, with a population of 141.
There are 8 cities in Chatham County, Georgia.