9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newport | 1 | 24,453 | 25,113 | -0.54% | 3,194 | 7.66 | City |
| Portsmouth town | 2 | 17,081 | 17,839 | -1.06% | 742 | 23.02 | Town |
| Middletown town | 3 | 16,184 | 17,062 | -1.23% | 1,274 | 12.70 | Town |
| Tiverton town | 4 | 15,747 | 16,340 | -0.91% | 542 | 29.06 | Town |
| Newport East | 5 | 11,613 | 11,289 | -0.09% | 2,019 | 5.75 | CDP |
| Tiverton | 6 | 8,237 | 7,996 | 0.55% | 1,971 | 4.18 | CDP |
| Jamestown town | 7 | 5,410 | 5,548 | -0.72% | 573 | 9.45 | Town |
| Little Compton town | 8 | 3,505 | 3,613 | -0.74% | 171 | 20.55 | Town |
| Melville | 9 | 2,068 | 1,877 | 2.48% | 986 | 2.10 | CDP |
Newport is the largest city in Newport County, with a population of 24,453.
Melville is the smallest city in Newport County.
There are 9 cities in Newport County, Rhode Island.