16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Palm City | 1 | 26,666 | 25,038 | 0.89% | 1,924 | 14 | CDP |
| Stuart | 2 | 20,072 | 17,542 | 2.59% | 2,821 | 7 | City |
| Hobe Sound | 3 | 14,855 | 14,764 | 1.52% | 2,090 | 7 | CDP |
| Jupiter Farms | 4 | 13,699 | 13,045 | 0.84% | 908 | 15 | CDP |
| Jensen Beach | 5 | 12,800 | 13,592 | 0.57% | 1,836 | 7 | CDP |
| Port Salerno | 6 | 11,777 | 12,070 | 0.96% | 3,303 | 4 | CDP |
| Indiantown | 7 | 6,872 | 6,561 | 0.91% | 485 | 14 | Village |
| Tequesta | 8 | 6,316 | 6,158 | 0.49% | 3,448 | 2 | Village |
| Hutchinson Island South | 9 | 3,954 | 5,025 | -2.06% | 918 | 4 | CDP |
| North River Shores | 10 | 3,468 | 3,895 | 0.76% | 2,739 | 1 | CDP |
| Sewall's Point | 11 | 2,091 | 1,996 | 0.92% | 1,775 | 1 | Town |
| Limestone Creek | 12 | 1,572 | 1,704 | 2.48% | 4,020 | 0 | CDP |
| Rio | 13 | 1,475 | 705 | 2.36% | 3,902 | 0 | CDP |
| Jupiter Island | 14 | 843 | 812 | 0.72% | 311 | 3 | Town |
| Jupiter Inlet Colony | 15 | 468 | 405 | 2.63% | 3,019 | 0 | Town |
| Ocean Breeze | 16 | 425 | 308 | 5.72% | 2,576 | 0 | Town |
Palm City is the largest city in Martin County, with a population of 26,666.
Ocean Breeze is the smallest city in Martin County, with a population of 425.
There are 16 cities in Martin County, Florida.