16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Savannah | 1 | 147,942 | 147,456 | 0.07% | 1,359 | 108.89 | City |
| Pooler | 2 | 32,122 | 25,676 | 4.18% | 1,159 | 27.71 | City |
| Port Wentworth | 3 | 16,836 | 10,916 | 7.56% | 1,048 | 16.07 | City |
| Wilmington Island | 4 | 15,259 | 15,607 | 0.05% | 1,838 | 8.30 | CDP |
| Garden City | 5 | 10,353 | 10,403 | -0.1% | 723 | 14.32 | City |
| Skidaway Island | 6 | 9,530 | 8,846 | 0.85% | 578 | 16.49 | CDP |
| Whitemarsh Island | 7 | 6,789 | 7,264 | -0.01% | 1,167 | 5.82 | CDP |
| Montgomery | 8 | 4,627 | 5,323 | 0.15% | 887 | 5.21 | CDP |
| Henderson | 9 | 3,344 | 2,694 | 3.5% | 1,926 | 1.74 | CDP |
| Bloomingdale | 10 | 3,293 | 2,883 | 2.55% | 235 | 14 | City |
| Tybee Island | 11 | 3,126 | 3,108 | 0.13% | 1,085 | 2.88 | City |
| Thunderbolt | 12 | 2,531 | 2,551 | -0.16% | 1,885 | 1.34 | Town |
| Isle Hope | 13 | 2,071 | 2,194 | -1.05% | 1,056 | 1.96 | CDP |
| Dutch Island | 14 | 1,271 | 1,338 | 0.08% | 517 | 2.46 | CDP |
| Talahi Island | 15 | 1,169 | 1,224 | -0.43% | 908 | 1.29 | CDP |
| Vernonburg | 16 | 142 | 139 | 0.71% | 352 | 0.40 | Town |
Savannah is the largest city in Chatham County, with a population of 147,942.
Vernonburg is the smallest city in Chatham County.
There are 16 cities in Chatham County, Georgia.