4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Nantucket | 1 | 14,806 | 14,239 | 0.93% | 321 | 46 | Town |
| Nantucket | 2 | 11,237 | 8,606 | 2.3% | 1,930 | 6 | CDP |
| Madaket | 3 | 338 | 291 | 1.81% | 170 | 2 | CDP |
| Siasconset | 4 | 92 | 89 | -8% | 43 | 2 | CDP |
Nantucket is the largest city in Nantucket County, with a population of 14,806.
Siasconset is the smallest city in Nantucket County, with a population of 92.
There are 4 cities in Nantucket County, Massachusetts.