7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Stuart | 1 | 20,578 | 17,542 | 2.52% | 2,892 | 7 | City |
| Indiantown | 2 | 6,934 | 6,561 | 0.9% | 480 | 14 | Village |
| Tequesta | 3 | 6,348 | 6,158 | 0.51% | 3,465 | 2 | Village |
| Sewall's Point | 4 | 2,110 | 1,996 | 0.91% | 1,791 | 1 | Town |
| Jupiter Island | 5 | 849 | 812 | 0.71% | 313 | 3 | Town |
| Jupiter Inlet Colony | 6 | 481 | 405 | 2.78% | 3,103 | 0 | Town |
| Ocean Breeze | 7 | 449 | 308 | 5.65% | 2,721 | 0 | Town |
Stuart is the largest city in Martin County, with a population of 20,578.
Ocean Breeze is the smallest city in Martin County, with a population of 449.
There are 7 cities in Martin County, Florida.