8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Savannah | 1 | 149,136 | 147,494 | 0.22% | 1,362 | 109 | City |
| Pooler | 2 | 32,544 | 25,678 | 4.4% | 1,175 | 28 | City |
| Port Wentworth | 3 | 15,851 | 10,918 | 6.63% | 986 | 16 | City |
| Garden City | 4 | 10,569 | 10,404 | 0.31% | 738 | 14 | City |
| Bloomingdale | 5 | 3,160 | 2,857 | 1.94% | 226 | 14 | City |
| Tybee Island | 6 | 3,147 | 3,106 | 0.25% | 1,092 | 3 | City |
| Thunderbolt | 7 | 2,531 | 2,553 | -0.2% | 1,885 | 1 | Town |
| Vernonburg | 8 | 140 | 137 | 0% | 347 | 0 | Town |
Savannah is the largest city in Chatham County, with a population of 149,136.
Vernonburg is the smallest city in Chatham County, with a population of 140.
There are 8 cities in Chatham County, Georgia.