4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Nantucket town | 1 | 14,446 | 14,237 | 0.01% | 313 | 46.19 | Town |
| Nantucket | 2 | 11,237 | 8,606 | 2.3% | 1,930 | 5.82 | CDP |
| Madaket | 3 | 338 | 291 | 1.81% | 170 | 1.99 | CDP |
| Siasconset | 4 | 92 | 89 | -8% | 43 | 2.13 | CDP |
Nantucket town is the largest city in Nantucket County, with a population of 14,446.
Siasconset is the smallest city in Nantucket County.
There are 4 cities in Nantucket County, Massachusetts.