8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Boston | 1 | 682,313 | 675,522 | 1.31% | 14,115 | 48 | City |
| Boston | 2 | 672,942 | 675,522 | -0.08% | 13,921 | 48 | City |
| Revere | 3 | 62,438 | 61,911 | 2.86% | 10,946 | 6 | City |
| Revere | 4 | 60,399 | 61,911 | -0.5% | 10,589 | 6 | City |
| Chelsea | 5 | 40,964 | 40,549 | 1.79% | 18,461 | 2 | City |
| Chelsea | 6 | 40,169 | 40,549 | -0.19% | 18,102 | 2 | City |
| Winthrop Town | 7 | 18,895 | 19,257 | 0.83% | 9,490 | 2 | City |
| Winthrop Town | 8 | 18,609 | 19,257 | -0.69% | 9,347 | 2 | City |
Boston is the largest city in Suffolk County, with a population of 682,313.
Winthrop Town is the smallest city in Suffolk County, with a population of 18,609.
There are 8 cities in Suffolk County, Massachusetts.