8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Boston city | 1 | 655,013 | 675,466 | 0.09% | 13,550 | 48.34 | City |
| Boston | 2 | 639,411 | 675,466 | -1.12% | 13,227 | 48.34 | City |
| Revere city | 3 | 56,910 | 61,876 | -0.91% | 9,977 | 5.70 | City |
| Revere | 4 | 55,339 | 61,876 | -2.31% | 9,702 | 5.70 | City |
| Chelsea city | 5 | 37,753 | 40,585 | -0.74% | 17,014 | 2.22 | City |
| Chelsea | 6 | 36,808 | 40,585 | -2.01% | 16,588 | 2.22 | City |
| Winthrop Town city | 7 | 17,975 | 19,254 | -0.95% | 9,028 | 1.99 | City |
| Winthrop Town | 8 | 17,695 | 19,254 | -1.73% | 8,887 | 1.99 | City |
Boston city is the largest city in Suffolk County, with a population of 655,013.
Winthrop Town is the smallest city in Suffolk County.
There are 8 cities in Suffolk County, Massachusetts.