4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Boston | 1 | 655,013 | 675,466 | 0.09% | 13,550 | 48.34 | City |
| Revere | 2 | 56,910 | 61,876 | -0.91% | 9,977 | 5.70 | City |
| Chelsea | 3 | 37,753 | 40,585 | -0.74% | 17,014 | 2.22 | City |
| Winthrop Town | 4 | 17,975 | 19,254 | -0.95% | 9,028 | 1.99 | City |
Boston is the largest city in Suffolk County, with a population of 655,013.
Winthrop Town is the smallest city in Suffolk County.
There are 4 cities in Suffolk County, Massachusetts.