24 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Savannah | 1 | 149,136 | 147,802 | 0.22% | 1,370 | 109 | City |
| Savannah | 2 | 149,136 | 147,494 | 0.22% | 1,370 | 109 | City |
| Pooler | 3 | 32,544 | 25,611 | 4.4% | 1,175 | 28 | City |
| Pooler | 4 | 32,544 | 25,678 | 4.4% | 1,175 | 28 | City |
| Port Wentworth | 5 | 15,851 | 10,879 | 6.63% | 986 | 16 | City |
| Port Wentworth | 6 | 15,851 | 10,918 | 6.63% | 986 | 16 | City |
| Wilmington Island | 7 | 15,259 | 15,607 | 0.05% | 1,838 | 8 | CDP |
| Garden City | 8 | 10,569 | 10,297 | 0.31% | 738 | 14 | City |
| Garden City | 9 | 10,569 | 10,404 | 0.31% | 738 | 14 | City |
| Skidaway Island | 10 | 9,530 | 8,846 | 0.85% | 578 | 16 | CDP |
| Whitemarsh Island | 11 | 6,789 | 7,264 | -0.01% | 1,167 | 6 | CDP |
| Montgomery | 12 | 4,627 | 5,323 | 0.15% | 887 | 5 | CDP |
| Henderson | 13 | 3,344 | 2,694 | 3.5% | 1,926 | 2 | CDP |
| Bloomingdale | 14 | 3,160 | 2,762 | 1.94% | 226 | 14 | City |
| Bloomingdale | 15 | 3,160 | 2,857 | 1.94% | 226 | 14 | City |
| Tybee Island | 16 | 3,147 | 3,110 | 0.25% | 1,092 | 3 | City |
| Tybee Island | 17 | 3,147 | 3,106 | 0.25% | 1,092 | 3 | City |
| Thunderbolt | 18 | 2,531 | 2,560 | -0.2% | 1,885 | 1 | Town |
| Thunderbolt | 19 | 2,531 | 2,553 | -0.2% | 1,885 | 1 | Town |
| Isle Hope | 20 | 2,071 | 2,194 | -1.05% | 1,056 | 2 | CDP |
| Dutch Island | 21 | 1,271 | 1,338 | 0.08% | 517 | 2 | CDP |
| Talahi Island | 22 | 1,169 | 1,224 | -0.43% | 908 | 1 | CDP |
| Vernonburg | 23 | 140 | 137 | 0% | 347 | 0 | Town |
| Vernonburg | 24 | 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 24 cities in Chatham County, Georgia.